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Licensee=Instituto Mexicanos Del Petroleo/3139900001 Not for Resale, 10/24/2007 08:25:21 MDT
ANSI/ISA-60079-27 (12.02.04)-2006, Fieldbus intrinsically safe concept (FISCO) and Fieldbus nonincendive concept (FNICO) ISBN: 978-1-55617-971-6 Copyright © 2006 by ISA. All rights reserved. Printed in the United States of America. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise), without the prior written permission of the Publisher. ISA 67 Alexander Drive P. O. Box 12277 Research Triangle Park, North Carolina 27709 USA
Copyright The Instrumentation, Systems, and Automation Society Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS Licensee=Instituto Mexicanos Del Petroleo/3139900001 Not for Resale, 10/24/2007 08:25:21 MDT
ANSI/ISA-60079-27 (12.02.04)-2006
This preface, as well as all footnotes and annexes, is included for information purposes and is not part of ANSI/ISA-60079-27 (12.02.04)-2006. This document has been prepared as part of the service of ISA toward a goal of uniformity in the field of instrumentation. To be of real value, this document should not be static but should be subject to periodic review. Toward this end, the Society welcomes all comments and criticisms and asks that they be addressed to the Secretary, Standards and Practices Board; ISA; 67 Alexander Drive; P. O. Box 12277; Research Triangle Park, NC 27709; Telephone (919) 549-8411; Fax (919) 5498288; E-mail: standards@isa.org. The ISA Standards and Practices Department is aware of the growing need for attention to the metric system of units in general, and the International System of Units (SI) in particular, in the preparation of instrumentation standards. The Department is further aware of the benefits to USA users of ISA standards of incorporating suitable references to the SI (and the metric system) in their business and professional dealings with other countries. Toward this end, this Department will endeavor to introduce SI-acceptable metric units in all new and revised standards, recommended practices, and technical reports to the greatest extent possible. Standard for Use of the International System of Units (SI): The Modern Metric System, published by the American Society for Testing & Materials as IEEE/ASTM SI 10-97, and future revisions, will be the reference guide for definitions, symbols, abbreviations, and conversion factors. It is the policy of ISA to encourage and welcome the participation of all concerned individuals and interests in the development of ISA standards, recommended practices, and technical reports. Participation in the ISA standards-making process by an individual in no way constitutes endorsement by the employer of that individual, of ISA, or of any of the standards, recommended practices, and technical reports that ISA develops. CAUTION — ISA ADHERES TO THE POLICY OF THE AMERICAN NATIONAL STANDARDS INSTITUTE WITH REGARD TO
EVEN IF ISA IS UNAWARE OF ANY PATENT COVERING THIS DOCUMENT. IT WILL REQUIRE THE OWNER OF THE PATENT TO EITHER GRANT A ROYALTY-FREE LICENSE FOR USE OF THE PATENT BY USERS COMPLYING WITH THE DOCUMENT OR A LICENSE ON REASONABLE TERMS AND CONDITIONS THAT ARE FREE FROM UNFAIR DISCRIMINATION. IF ISA IS INFORMED OF AN EXISTING PATENT THAT IS REQUIRED FOR USE OF THE DOCUMENT. THE USER MUST ALSO CONSIDER THE
Copyright The Instrumentation. THE USE OF THIS DOCUMENT MAY INVOLVE HAZARDOUS MATERIALS. and Automation Society Provided by IHS under license with ISA Licensee=Instituto Mexicanos Del Petroleo/3139900001 No reproduction or networking permitted without license from IHS Not for Resale. OPERATIONS OR EQUIPMENT. HOWEVER. 10/24/2007 08:25:21 MDT
. THE USER SHOULD CAREFULLY INVESTIGATE RELEVANT PATENTS BEFORE USING THE DOCUMENT FOR THE USER’S INTENDED APPLICATION. ISA TAKES NO POSITION ON THE EXISTENCE OR VALIDITY OF ANY PATENT RIGHTS THAT MAY BE INVOLVED IN IMPLEMENTING THE DOCUMENT. ADDITIONALLY. THE USER OF THIS DOCUMENT MUST EXERCISE SOUND PROFESSIONAL JUDGMENT CONCERNING ITS USE AND APPLICABILITY UNDER THE USER’S PARTICULAR CIRCUMSTANCES.PATENTS. ISA IS NOT RESPONSIBLE FOR IDENTIFYING ALL PATENTS THAT MAY REQUIRE A LICENSE BEFORE IMPLEMENTATION OF THE DOCUMENT OR FOR INVESTIGATING THE VALIDITY OR SCOPE OF ANY PATENTS BROUGHT TO ITS ATTENTION. Systems. THE DOCUMENT CANNOT ANTICIPATE ALL POSSIBLE APPLICATIONS OR ADDRESS ALL POSSIBLE SAFETY ISSUES ASSOCIATED WITH USE IN HAZARDOUS CONDITIONS. ISA ASKS THAT ANYONE REVIEWING THIS DOCUMENT WHO IS AWARE OF ANY PATENTS THAT MAY IMPACT IMPLEMENTATION OF THE DOCUMENT NOTIFY THE ISA STANDARDS AND PRACTICES DEPARTMENT OF THE PATENT AND ITS OWNER. OR MATERIALS COVERED BY PATENT RIGHTS. PROCESSES. THE USER IS CAUTIONED THAT IMPLEMENTATION OF THE DOCUMENT MAY REQUIRE USE OF TECHNIQUES.
02. Bishop H. Coppler. Chair W. Cardinal C. Engler G. Shell Exploration & Production Company Cable Tray Institute Bently Nevada LLC Nabors Industries Waldemar S Nelson & Company Inc. 10/24/2007 08:25:21 MDT
. Ametek Drexelbrook Mine Safety Appliances Company David N Bishop Consultant Consultant PSC Solutions Mobil Chemical Company Det Norske Veritas DNV GE Energy Industrial Scientific Corporation Pepperl + Fuchs Inc. Casso J. Lawrence. CSA International Rosemount Inc. Miller A. THE COMMITTEE HAS NOT YET ADDRESSED THE POTENTIAL ISSUES IN THIS VERSION. Cospolich S. Dolphin T. Bishop C. Schnaare D. David N Bishop Consultant R. Neagle C. Dolphin U. Bombria J. Allen S.04)-2006
APPLICABILITY OF ANY GOVERNMENTAL REGULATORY LIMITATIONS AND ESTABLISHED SAFETY AND HEALTH PRACTICES BEFORE IMPLEMENTING THIS DOCUMENT. Czaniecki J. and Automation Society Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
COMPANY FM Approvals Ametek Inc. Professional Testing NIOSH
Licensee=Instituto Mexicanos Del Petroleo/3139900001 Not for Resale. Page B. Co-Chair M. Schimmoeller T. Dow Chemical Company COMPANY Rosemount Inc. Kozinski S. Wechsler The following people served as members of ISA SP12: NAME T. Stahl Inc. Boegli D. Ankele D. FM Approvals Ametek Inc. Intrinsic Safety Concepts Inc. Burns R. Optimation Technology Underwriters Laboratories Inc. Bockle K. Leverington J. Buschart R. GE Infrastructure Sensing Bently Detector Electronics Corporation 3M Company Intertek ETL SEMKO ExLoc Corporation MSHA Approval & Certification Center Underwriters Laboratories Inc. Garcha J. Arnold W. Systems. Dugar A. Schaefer P. Mobley J. The following people served as members of ISA SP12. Chair M. Managing Director N.02: NAME N. Ludlam. Bennett D. Oudar A. Abbatiello D.ANSI/ISA-60079-27 (12. Schnaare. Hohenstein G. Coppler. Abbatiello R. THE USER OF THIS DOCUMENT SHOULD BE AWARE THAT THIS DOCUMENT MAY BE IMPACTED BY ELECTRONIC SECURITY ISSUES. Managing Director N. Dubaniewicz
Copyright The Instrumentation. Phoenix Contact Inc. Optimation Technology Honeywell Inc. Genre D.
Seitz D. Sasajim a T.ANSI/ISA-60079-27 (12. Iverson Zieli nski R. McFarla nd R. Sands H. Maggioli T. McAvin ew A. Weis er s W. Amir R. Wid E. Bifold-Fluid Power Adalet PLM Honeywell Inc. A. D. Industrial Scientific Corporation Killark Turck Inc. Lindner V. Kovscek J. Fiske G. Hohenstein D.04)-2006 Mobil Chemical Company Det Norske Veritas Intertek Testing Services GE Energy Pepperl + Fuchs Inc.02. Larson E. Dumorti J. Dugar A. Jones K. Mobley A. This Wechsler standard
. Massey A. Page P. Engler W. ra F. Johnscher F. Holland M. Vice President Verhap Tate pen. Wei M. Kuczka B. McCaul ey G. Garcha D. Jagger J. Rockwell Automation 3M Company MSHA Approval & Certification Center CSA International Artech Engineering Dow Chemical Company NAME e I. Schimmoeller R. Reimer N. J. mey Icayan er M. Schnaar
U. Kent P. Coppler dma n B. Web b Bishop W.
and Automation Society Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
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. Proc Schneid ess er Solu Electric tions Consult AG
Feltronics Corporation Jacobs Engineering Group Chagrin Valley Controls Inc. Emerson Process Mgmt. Canada Ivy Limited Opti E I Du ks Pont Con Compa sulta ny nt David N Endr Bishop ess Consult + ant Hau Ametek ser Inc. Pwr & Water Solutions Rockwell Automation E I du Pont Yamatake Corporation Rosemount Inc.COMPA ant NY ACE Syncrud S e Inc. Robert C Webb PE Worley Parsons KEMA Inc. Stanford Linear Accelerator Center Emerson Process Management
Copyright The Instrumentation. Tatera & Associates Inc. Systems.
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02.04)-2006
5 Scope 11 6 Normative References 11 7 Terms and definitions 12 8 Power supplies 13 9 General 13 10 Additional requirements of FISCO power supplies 13 11 Additional requirements of FNICO power supplies 14 5 Field devices 14 12 General 14 13 FISCO field devices 15 14 FNICO field devices 15 6 Terminator 15 15 General 15 16 FISCO terminator 16 17 FNICO terminator 16 7 System requirements 16 18 General 16 19 FISCO system requirements 17
.ANSI/ISA-60079-27 (12.
.....................................Assessment of máximum output current for use with FNICO rectangular supplies .. and Automation Society Provided by IHS under license with ISA Licensee=Instituto Mexicanos Del Petroleo/3139900001 No reproduction or networking permitted without license from IHS Not for Resale... 14
Copyright The Instrumentation..Typical system ....................................Assessment of máximum output current for use with FISCO rectangular supplies ............ 13 Table 2 ............................... 21 Table 1 .. 23 Figure 1 .................................. 10/24/2007 08:25:21 MDT
...................................... Systems....................20 FNICO system requirements 17 8 Marking 18 21 FISCO marking 18 22 FNICO marking 18 9 Examples of marking 18 23 Examples of FISCO marking 18 24 Examples of FNICO marking 20 10 System diagram 21 Annex A (informative) United States major deviations ...............................................................................
Systems. 10/24/2007 08:25:21 MDT
Copyright The Instrumentation. and Automation Society Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS Licensee=Instituto Mexicanos Del Petroleo/3139900001 Not for Resale.This page intentionally left blank.
National Deviations are shown by strikeout through deleted text and underline under added text. Annex A is informative and is not considered part of this standard.ANSI/ISA-60079-27 (12.S. U.04)-2006
All text of IEC 60079-27:2005 (1st Edition) is included in this document.
.02. There is one annex in this standard. Tables or portions of tables that are to be considered deleted are shown as shaded.
.Copyright The Instrumentation. and Automation Society Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
Licensee=Instituto Mexicanos Del Petroleo/3139900001 Not for Resale. Systems.
.3. of ANSI/ISA-60079-11 may be used to designate electrical circuit parameters on the apparatus and in the installation documents and control drawing. P .04)-2006
This part of IEC 60079 standard contains the details of apparatus.. I . IEC 60079-14. with U . NOTE 2 A typical system is illustrated in Clause 10. if the comparison of the electrical parameters U . but may enter Zone 0 locations if specifically permitted to do so by the Control Drawing documentation.) for electrical parameters through out. except as modified by this standard. This apparatus may be accepted in a FISCO system. either the ISA markings. demonstrate compatibility with the remainder of the oo o ii i system. the IEC markings.5 of the National Electrical Code ANSI/NFPA 70. NOTE 4 This standard uses the IEC designations (Uo. Divisions 1 and 2 as permitted by 501. Zone 2. In these circumstances. P . bus powered systems designed in accordance with IEC 61158-2 which is the physical layer standard for Fieldbus installations. however. and all the other requirements of this standard are met. IEC 60079-15 and IEC 60079-25.
NOTE 1 Certification to the FISCO requirements does not prevent apparatus also being certified and marked to IEC 60079-11 ANSI/ISA-60079-11 in the conventional manner so that they may be used in other systems. The constructional and installation requirements of FISCO and FNICO apparatus and systems are determined by ANSI/ISA60079-11 and ANSI/ISA-60079-15 IEC 6007911. NOTE 3 Generally. as shown in Table 12. Zones 0 and 1 and the Fieldbus Non-Incendive Concept (FNICO) for installation and use in Class I. Po etc. systems and installation practice for use with the Fieldbus Intrinsically Safe Concept (FISCO) for installation and use in Class I. Some apparatus certified before this standard was published but not necessarily complying with the electrical parameters of this standard may be marked ‘Suitable for FISCO systems’. the requirements of this standard apply only to that part of the apparatus directly connected to the intrinsically safe or non-incendive trunk or spurs. It is based on the concepts of Manchester encoded.02. Part of a Fieldbus device may be protected by any of the methods of explosion protection listed in ANSI/ISA-60079-0 suitable for the application IEC 60079-0. NOTE 5 This standard is for apparatus for use in a Class I Zone 0.11 -
ANSI/ISA-60079-27 (12. I . FNICO systems are intended for use in Zone 2 locations. FISCO systems are predominantly intended for use in Zone 1 and 2 locations. appropriate to the Zone of intended use. 1 or 2 hazardous (classified) location but the principles contained may be used for examination of apparatus for use in Class I. Io. or both.
Electrical apparatus for explosive gas atmospheres – Part 11: Intrinsic safety "i" ANSI/ISA-60079-11 (12. Zones 0. Electrical apparatus for explosive gas atmospheres – Part 0: General requirements ANSI/ISA-60079-0 (12. Zones 0. 1 & 2 Hazardous (Classified) Locations . the latest edition of the referenced document (including any amendments) applies.01). 10/24/2007 08:25:21 MDT
. National Electrical Code IEC 60050-426. Electrical Apparatus for Use in Class I. Electrical Apparatus for Use in Class I.01). Systems. For undated references. International Electrotechnical Vocabulary (IEV) – Electrical apparatus for explosive atmospheres IEC 60079-0. and Automation Society Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
Licensee=Instituto Mexicanos Del Petroleo/3139900001 Not for Resale.The following referenced documents are indispensable for the application of this document.Intrinsic Safety "i"
Copyright The Instrumentation. only the edition cited applies. 1 & 2 Hazardous (Classified) Locations: General Requirements IEC 60079-11.00. ANSI/NFPA 70:2005.02. For dated references.
Electrical apparatus for explosive gas atmospheres – Part 14: Electrical installations in hazardous areas (other than mines) IEC 60079-15. Recommendations for the Preparation.02)-2003. Content.04)-2006
. under specified test conditions.Type of Protection "n" IEC 60079-25:2003.02. Systems.
Copyright The Instrumentation. ANSI/ISA-60079-0 IEC 60079-0 and ANSI/ISA-60079-11 IEC 60079-11 apply. Electrical apparatus for explosive gas atmospheres . Also referred to as “Energy Limited Circuit” 3. or of the nonincendive field wiring apparatus or associated nonincendive field wiring apparatus.02. that details the allowed interconnections between the intrinsically safe and associated apparatus or between the nonincendive field wiring apparatus or associated nonincendive field wiring apparatus.2 FNICO Fieldbus Non-Incendive Concept 3. Electrical apparatus for explosive gas atmospheres – Part 15: Type of protection ‘n’ ANSI/ISA-60079-15 (12.4 control drawing a drawing or other document provided by the manufacturer of the intrinsically safe or associated apparatus.12.Part 2: Physical layer specification and service definition 3 Terms and definitions
For the purposes of this document.Part 25: Intrinsically safe systems ISA-RP12.3 non-incendive a concept in which any arc or thermal effect produced under intended operating conditions of the equipment is not capable.02. the terms and definitions given in IEC 60050-426. Electrical Apparatus for Use in Class I. Zone 2 Hazardous (Classified) Locations . of igniting the flammable gas-air mixture. and Automation Society Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
Licensee=Instituto Mexicanos Del Petroleo/3139900001 Not for Resale. Digital data communications for measurement and control .12 -
IEC 60079-14:2002.Fieldbus for use in industrial control systems . and Organization of Intrinsic Safety Control Drawings IEC 61158-2.ANSI/ISA-60079-27 (12. 10/24/2007 08:25:21 MDT
.1 FISCO Fieldbus Intrinsically Safe Concept 3. together with the following: 3.
.5 V under the fault conditions specified in ANSI/ISA-60079-11 IEC 60079-11 or less than 14 V under normal operation. The power supply shall be constructed in accordance with ANSI/ISA-60079-11IEC 60079-11. or shorting of any two of the field wiring conductors connected to the field terminals of the apparatus.02. The maximum output current Io for any type of power supply shall be determined in accordance with ANSI/ISA-60079-11 IEC 60079-11. The output from the power supply may be connected to earth ground.1
ANSI/ISA-60079-27 (12.3 of ANSI/ISA-6007911-2002. The maximum output current Io for any type of FISCO power supply shall be determined in accordance with ANSI/ISA-60079-11 IEC 60079-11 but shall not exceed 380 mA.04)-2006 Power supplies General
The maximum unprotected internal capacitance Ci and inductance Li shall be not greater than 5 nF and 10 µH. Table 1 may be used for assessment. shall be not greater than 17. For rectangular supplies.
4. shorting and earthing grounding of field wiring connected to the field terminals of the apparatus. The maximum output voltage. Uo. except as modified by this standard.. For FISCO Systems the The determination of power supply output parameters shall take into account the possible opening. respectively.
NOTE A circuit with electronic current limitation which provides a non-linear output characteristic is not suitable for level of protection “ia”. See 7. No specification of the internal parameters Li and Ci or the maximum external parameters Lo and Co is required on the certificate. For FNICO Systems the determination of power supply output parameters shall take in to account the possible opening or grounding of any one.13 4 4.5. control drawing or label.2 Additional requirements of FISCO power supplies The power supply shall either be resistive limited or have a trapezoidal or rectangular output characteristic.
5 safety factor) mA 183 133 103 81 75
Perm (inc mA
NOTE The top two values for IIB are derived from 5. Systems.
Copyright The Instrumentation.5 Permissible current.1– Asses sment of maxim um output curren t for use with FISCO rectan gular suppli es
Uo V 14 15 16 17 17. and Automation Society Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
. for IIC (includes 1.32 W.
for IIC mA 274 199 154 121 112 Permissible current. 5 Field devices 5.5 Permissible current.
NOTE Information on trapezoidal output characteristics can be found in IEC 60079-25. for IIB mA 570 531 432 360 319
The control drawing apparatus documentation shall state that the power supply is suitable for use in a FNICO system in accordance with this standard. The control drawing apparatus documentation shall state that the power supply is suitable for use in a FISCO system in accordance with this standard.
Copyright The Instrumentation.
4.02.5 V. Uo. Table 2 may be used for assessment. Field devices not intended to be installed within the hazardous area are not required to be temperature classified.5 V or less than 14 V under normal operation.0 shall be used in the place of those in ANSI/ISA-60079-11 IEC 60079-11. The maximum output voltage. A safety factor of 1. The requirements are as follows: 25 apparatus shall have minimum input voltage parameter of Ui: 17.1 General
These requirements apply to apparatus other than the power supply and terminators connected to the intrinsically safe or non-incendive field wiring bus whether installed inside or outside the hazardous area. except as modified by this standard. 10/24/2007 08:25:21 MDT
. The power supply shall be constructed in accordance with the requirements of Clause 22 of ANSI/ISA60079-15 IEC 60079-15.3
Additional requirements of FNICO power supplies
The power supply shall either be resistive limited or have a trapezoidal or rectangular output characteristic. and Automation Society Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
Licensee=Instituto Mexicanos Del Petroleo/3139900001 Not for Resale. Table 2 – Assessment of maximum output current for use with FNICO rectangular supplies
Uo V 14 15 16 17 17. The maximum output current Io for any type of FNICO power supply shall be determined in accordance with ANSI/ISA-60079-11 IEC 60079-11 but references to faults within the power supply shall be ignored. Systems.ANSI/ISA-60079-27 (12.14 -
The maximum output power Po shall not exceed 5. 26 the bus terminals shall be isolated from earth ground in accordance with ANSI/ISA-60079-11 IEC 60079-11.04)-2006
. For rectangular supplies. shall be not greater than 17.32 W.
the terminals shall not be a source of energy to the system except for a leakage current not greater than 50 µA. 30 apparatus shall have a internal inductance Li not greater than 10 µH.3 FNICO field devices
The additional requirements for FNICO field devices are as follows: 34 apparatus shall have an internal inductance Li not greater than 20 µH.. 28 the maximum unprotected internal capacitance Ci of each field device shall not be greater than 5 nF. 36 field devices shall be suitable for IIC apparatus group and temperature classified and constructed in accordance with ANSI/ISA-60079-15 for apparatus group IIC and IEC 60079-15 with the protection
. 5. 33 the apparatus documentation shall state that the apparatus is suitable for use in a FISCO system in accordance with this standard. 32 field devices shall be allocated a category. 35 under normal conditions as specified in ANSI/ISA-60079-15 IEC 60079-15.02. the terminals shall not be a source of energy to the system except for a leakage current not greater than 50 µA. 5. 31 under normal or fault conditions as specified in ANSI/ISA-60079-11 IEC 60079-11 the bus terminals shall remain passive. i. be suitable for IIC apparatus group and temperature classified and constructed in accordance with ANSI/ISA-60079-11 for apparatus group IIC IEC 60079-11. i.15 -
ANSI/ISA-60079-27 (12.e.04)-2006 27 the bus terminals of separately powered field devices shall be galvanically isolated so as to ensure that these terminals remain passive and multiple earthing grounding of the bus is avoided. the bus terminals shall remain passive.2 FISCO field devices
The additional requirements of FISCO field devices are as follows: 29 apparatus shall have minimum input parameters of Ii: 380 mA and Pi: 5.32 W.e. No specification of the input and internal parameters is required on the certificate. control drawing or label.
2 µF. and Automation Society Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
Licensee=Instituto Mexicanos Del Petroleo/3139900001 Not for Resale. the National Electrical Code® did not recognize protection type “nL”. 6 6.type nL nC in accordance with Clause 22 of ANSI/ISA-60079-15 at the bus terminals.
NOTE: At the time that this standard was prepared.1 Terminator General
The line terminators required by the system shall comprise a resistor-capacitor combination which presents at its terminals a circuit equivalent to a resistor of value 90 Ω to 102 Ω in series with a capacitor of 0 µF to 2.
The terminator shall
NOTE 1 IEC 61158-2 requires an operational capacitance value of 0.
d) the control drawing apparatus documentation shall state that the apparatus is suitable for use in a FNICO system in accordance with this standard. Systems.8 µF to 1. 10/24/2007 08:25:21 MDT
.2 µF (including tolerances).
39 have a maximum unprotected internal inductance Li not greater than 10 µH. including the length of all spurs.02.
Copyright The Instrumentation. maximum length of each spur cable 60 m in IIC and IIB.3
FNICO terminator
The additional requirements are that a FNICO terminator shall be suitable for apparatus group IIC and be temperature classified and constructed in accordance with ANSI/ISA-60079-15 IEC 60079-15 ‘nL' ‘nC’ apparatus. is used. The terminators may be incorporated within field devices or power supplies. 7 7. Where a system comprises • one source of power.32 W.
. no further consideration of cable parameters is necessary. Systems.2
FISCO terminator
The additional requirements are that a FISCO terminator shall a) have minimum input parameters of Ii: 380 mA and Pi: 5.16 -
38 be isolated from earth ground in accordance with ANSI/ISA-60079-11 IEC 60079-11. The cable parameters may be determined in accordance with Annex C of IEC 60079-14. b) be allocated a category. and Automation Society Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS Licensee=Instituto Mexicanos Del Petroleo/3139900001 Not for Resale.5 V.ANSI/ISA-60079-27 (12. The terminator control drawing documentation shall state that the terminator is suitable for use in a FNICO system in accordance with this standard. be suitable for apparatus group IIC and be temperature classified and constructed in accordance with ANSI/ISA-60079-11 IEC 60079-11. capacitance Cc 45 nF/km to 200 nF/km.
6.1 System requirements General
A system is usually of the form illustrated in Figure 1. The cable used in the system shall comply with the following parameters: • • • • loop resistance Rc 15 Ω/km to 150 Ω/km.
NOTE 2 For safety assessment purposes the effective capacitance of the terminator Ci is considered not to affect the intrinsic safety or incendivity of the system. 10/24/2007 08:25:21 MDT
. The terminator control drawing documentation shall state that the terminator is suitable for use in a FISCO system in accordance with this standard. When the cable. • maximum length of each trunk cable. which complies with this standard.
6.04)-2006 37 have minimum input parameters of Ui: 17.4 mH/km to 1 mH/ km. loop inductance Lc 0. 1 km in IIC and 5 km in IIB.
It is also necessary to confirm that the permitted maximum ambient temperature of each piece of apparatus is suitable for its intended location. 7.04)-2006 any number of field devices up to 32.02 NOTE 2: The apparatus group of the power supply determines the apparatus group of the system.
Connection facilities and/or switches may be added to a system without modifying the safety assessment.2
FISCO system requirements
The power supply and all field devices and terminators used in a FISCO system must comply with the FISCO requirements of this standard and be marked with ‘FISCO’. then that system shall be considered to be adequately safe.02.
The safety documentation control drawing shall clearly identify the category of each part of a system. terminators. then that spur is restricted to a length of 30 m. an ‘ia’ spur may be created from an ‘ib’ trunk by the insertion of a suitably certified interface. all complying with the requirements of this standard combined with a cable to the above specification. apparatus and power supply used.
The two terminators shall be situated at the ends of the trunk. together with relevant apparatus documentation used.02. NOTE 3: The temperature classification of each piece of apparatus should shall be determined by its certification.
NOTE 1: The control drawing should comply with the applicable requirements of ISA-RP12.. no further consideration of the suitability of the apparatus is required. Where the power supply is connected via a spur.17 •
ANSI/ISA-60079-27 (12. The safety documentation may be simplified to a list of the equipment.
7. and • two terminators. The system will have a level of protection category (ia or ib) determined by the field devices. The power supply shall be located not more than 30 m from one end of the trunk.3 FNICO system requirements
NOTE: Sub-systems of the system may have different categories where this can be justified by the assessment.
NOTE The number of field devices which can be connected to a spur is not restricted by consideration of explosion safety but may be restricted by operational constraints. For example. When such apparatus is combined in a system in accordance with this standard. field devices and terminators
Copyright The Instrumentation.and other ancillaries complying with the FISCO requirements of this standard may also be used in a FNICO system. may be used in a FNICO system.5 V and internal parameters of Li and Ci not greater than 20 µH and 5 nF respectively. but constructed in accordance with the requirements of IEC 60079-15 ‘nL' apparatus and having input parameters of Ui not less than 17. The control drawing shall clearly identify the category of each part of a system. apparatus not approved as FNICO apparatus. terminators and other ancillaries complying with the requirements of intrinsic safety but not as FISCO apparatus in accordance with this standard may be used with a FNICO power supply in a FNICO system provided that they have input parameters of Ui not less than 17.5 V and internal parameters of Li and Ci not greater than 20 µH and 5 nF respectively Similarly. Field devices. 10/24/2007 08:25:21 MDT
care shall be taken to differentiate between the FISCO marking and the marking for the intrinsically safe system. Io. Po and Lo/Ro need not be marked. Systems.18 -
NOTE: Where intrinsically safe or type ‘nC’ ‘nL’ apparatus is used in a FNICO system. field device or terminator. Where apparatus is dual marked so that it can be used in both a FISCO system and a conventional intrinsically safe system.02. Ci.2 FNICO marking
Each piece of apparatus shall be marked with the word "FNICO" followed by an indication of its function. Ci. power supply. Ii. Li. power supply. each piece of apparatus shall be marked in accordance with ANSI/ISA-60079-11 IEC 60079-11. Co.04)-2006
. i. 10/24/2007 08:25:21 MDT
. For FISCO power supplies. The marking of apparatus for use in either a FISCO system or a conventional intrinsically safe system shall differentiate between the FISCO marking and the marking for the intrinsically safe system. Ii. Pi and Li/Ri need not be marked. Io. The marking of apparatus for use in either a FNICO system or a conventional nonincendive field wiring system shall differentiate between the FNICO marking and the marking for the nonincendive field wiring. the manufacturer’s name and address must still be marked. except where modified by this standard. 8. Lo. output parameters Uo. In addition. except where modified by this standard. For FISCO field devices or terminators. For example. 9 9. For FNICO field devices or terminators. Li.
8 8. field device or terminator. Pi and Li/Ri need not be marked. Po and Lo/Ro need not be marked. In addition. output parameters Uo.ANSI/ISA-60079-27 (12. input and internal parameters Ui. and Automation Society Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
Licensee=Instituto Mexicanos Del Petroleo/3139900001 Not for Resale.e. Co. For FNICO power supplies. i. A plant label marked ‘FNICO AEx nCL system’ is an acceptable way of satisfying this requirement. this should be indicated at the point of installation.1 Examples of marking Examples of FISCO marking FISCO power supply Um: 250 V [AEx ia] IIC John Jones Ltd SW99 2AJ UK Type: DRG OOI –20 °C < Ta < +50 °C
Copyright The Instrumentation.e.1
Marking FISCO marking
Each piece of apparatus shall be marked with the word "FISCO" followed by an indication of its function. input and internal parameters Ui. Lo. each piece of apparatus shall be marked in accordance with ANSI/ISA-60079-15 IEC 60079-15.
04)-2006
Copyright The Instrumentation.02.– 19 – PTB Nr 01A 2341 Serial No: 014321 JJDRG001 40 Field device FISCO field device Class I Zone 0 AEx ia IIC T4 Paul McGregor plc GL99 1JA UK Type: RWS 001 –20 °C < Ta < +60 °C INERIS 01 A 1234 Serial No 013241 Control Drawing PM0165 41 Terminator FISCO terminator Cl I Zn 0 AEx ia IIC T4 James Bond plc MK45 6BY UK Type MI5 007 BAS 01 A 4321 Serial No: 012345 Control Drawing P45 42 Dual marked field device A McTavish plc GL 98 1BA UK Type RWS 002 –20 °C < Ta < +60 °C INERIS 02 A 2345 Serial No: 060128 FISCO Field device Class I Zone 0 AEx ia IIC T4 Control Drawing MT002 Class I Zone 0 AEx ia IIC T6 Ui: 28 V Control Drawing
ANSI/ISA-60079-27 (12. and Automation Society Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
04)-2006 Ci: 3 nF Ii: 200 mA Li: 10 µH Pi: 1.20 -
9.ANSI/ISA-60079-27 (12.02. 10/24/2007 08:25:21 MDT
.2 W Control Drawing MT003
. Systems.2
Examples of FNICO marking supply [AEx nAL] IIC John Jones Ltd SW99 2AJ UK Type: DRG OO2 –20 °C < Ta < +50 °C PTB Nr 01A 3412 Serial No: 015321 Control Drawing JJDRG002
43 Power supply FNICO power
44 Field device FNICO field device Class I Zone 2 AEx nAL IIC T4 Paul McGregor plc GL99 1JA UK Type: RWS 002 –20 °C < Ta < +60 °C INERIS 01 A 1234 Serial No 023241 Control Drawing PM0169 45 Terminator FNICO terminator Class I Zone 2 AEx nAL IIC T4 James Bond plc MK45 6BY UK Type MI5 008 BAS 03 A 4321 Serial No: 022341 Control Drawing P58
Copyright The Instrumentation. and Automation Society Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
Systems.. 10/24/2007 08:25:21 MDT
Hazardou s área
. and Automation Society Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
Licensee=Instituto Mexicanos Del Petroleo/3139900001 Not for Resale.04)-2006
EC 510/05
Key 46 Terminator 47 Power supply 48 Data 49 Hand held terminal U 50 Field devices 51 Trunk 52 Spur
Figure 1 – Typical system
Copyright The Instrumentation.02.21 -
ANSI/ISA-60079-27 (12.
Copyright The Instrumentation.This page intentionally left blank. Systems. and Automation Society Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
. 8.04)-2006
Annex A (informative) United States major deviations
NOTE: The text of Annex A has been added. 3.12. IEC references have been replaced with US standard references where possible. together with a reference to the applicable clauses of ANSI/ISA-60079-15. The underlining has been omitted for clarity.23 -
ANSI/ISA-60079-27 (12.02.
5.3c) The National Electrical Code does not recognize the term “nL” and therefore the alternative code “nC” which is recognized.1 A deviation to allow a reduction in the number of faults in wiring for FNICO systems has been added to align with ANSI/ISA12.2 A requirement to differentiate between FNICO and nonincendive field wiring has been added. has been used..01.4 The definition for
control drawing has been added.
Copyright The Instrumentation. 10/24/2007 08:25:21 MDT
. Systems. and Automation Society Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
Licensee=Instituto Mexicanos Del Petroleo/3139900001 Not for Resale. Systems. 10/24/2007 08:25:21 MDT
.Copyright The Instrumentation. Systems.
and technical reports is one of ISA’s primary goals. chairmen and reviewers.Developing and promulgating sound consensus standards.O. To achieve this goal the Standards and Practices Department relies on the technical expertise and efforts of volunteer committee members. 10/24/2007 08:25:21 MDT
. recommended practices. NC 27709 ISBN: 978-1-55617-971-6
Copyright The Instrumentation. ISA is an American National Standards Institute (ANSI) accredited organization. Box 12277 Research Triangle Park. please write: ISA Attn: Standards Department 67 Alexander Drive P. and Automation Society Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
Licensee=Instituto Mexicanos Del Petroleo/3139900001 Not for Resale. To obtain additional information on the Society’s standards program. ISA administers United States Technical Advisory Groups (USTAGs) and provides secretariat support for International Electrotechnical Commission (IEC) and International Organization for Standardization (ISO) committees that develop process measurement and control standards. Systems.
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ANSI-IsA-60079-27 Fieldbus Intrinsically Safe Concept (FISCO) and Fieldbus by Manuel Carvajal Grajales250 viewsEmbedDownloadRead on Scribd mobile: iPhone, iPad and Android.Copyright: Attribution Non-Commercial (BY-NC)List price: $0.00Download as RTF, PDF, TXT or read online from ScribdFlag for inappropriate contentMore informationShow less
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