Product Information

ECN 1123 S
EQN 1135 S
Absolute Rotary Encoders
with DRIVE-CLiQ Interface for
Safety-Related Applications
Firmware 5302/2020

ECN 1123 S, EQN 1135 S
Rotary encoders for absolute position values with safe singleturn information• 75A mounted stator coupling• Blind hollow shaft (¬ 6 mm) for axial clamping (1KA)

Required mating dimensions

 = Bearing of mating shaft
M1 = Measuring point for operating temperature
M2 = Measuring point for vibration
1 = Contact surface of slot
2 = Chamfer at start of thread is mandatory for material bonding anti-rotation lock3 = Shaft surface; ensure full-surface contact!
4 = Slot required only for ECN/EQN and ECI/EQI with WELLA1 = 1KA
5 = ECI/EQI FS flange surface: ensure full-surface contact!
6 = Coupling surface of ECN/EQN
7 =	Maximum permissible deviation between the shaft surface and coupling surface; compensation of mounting tolerances and thermal expansion,of which ±0.15 mm of dynamic axial motion is permitted
8 = Maximum permissible deviation between the shaft surface and flange surface; compensation of mounting tolerances and thermal expansion
9 = ECI/EBI flange surface; ensure full-surface contact!
10 = Undercut
11 = Possible centering hole
12 = 15-pin PCB connector
13 = Cable fastener with crimp sleeve; diameter: 4.3 mm ±0.1 mm; length: 7 mm
14 = Positive locking element; ensure correct engagement in Slot 4 (e.g., by measuring the device overhang)
15 = Direction of shaft rotation for ascending position values
16 = Uncoated; shaft coating not permitted

2

Product Information ECN 1123 S, EQN 1135 S   02/2020

Specifications

ECN 1123 S singleturn

Functional safetyfor applications with up toAs a single-encoder system for monitoring functions and closed-loop functions• SIL 2 as per EN 61508 (further basis for testing: EN 61800-5-2)• Category 3, PL d as per EN ISO 13849-1:2015
Safe in singleturn operation

PFH1)≤ 27 · 10–9 (probability of dangerous failure per hour)2)

EQN 1135 S multiturnSafe position

Encoder: ±1.76° (safety-related measuring step SM = 0.7°)
Mechanical coupling: ±2° (fault exclusion for the loosening of the shaft coupling and stator
coupling, designed for accelerations ≤ 300 m/s2)Interface/ordering designation

DRIVE-CLiQ / DQ01

Firmware01.32.26.53
3)

Siemens software
Firmware 01.32.26.53

SINAMICS, SIMOTION: ≥ V4.4 HF4;
SINUMERIK with safety: ≥ V4.4 SP2; SINUMERIK without safety: ≥ V4.4 SP1 HF3Position values per revolution

8 388 608 (23 bits)

Revolutions–4)4096 (12 bits)

Calc. time TIME_MAX_ACTVAL≤ 8 μsSystem accuracy±60"

Electrical connection

15-pin PCB connector (with connection for external temperature sensor )Cable length≤ 40 m (see Cable lengths in the Cables and Connectors brochure)Supply voltage

DC 24 V (10 V to 28.8 V); up to DC 36.0 V possible without compromising functional safety

Power consumption (max.)

At 10 V: ≤ 850 mW; at 28.8 V: ≤ 900 mW

At 10 V: ≤ 950 mW; at 28.8 V: ≤ 1000 mW

Current consumption (typical)

At 24 V: 32 mA (without load)

At 24 V: 35 mA (without load)

Shaft

Blind hollow shaft (¬ 6 mm) with positive-locking element (1KA)
6)

5)

Speed

≤ 12 000 rpm

Starting torque (typical)

0.001 Nm (at 20 °C)

Moment of inertia of rotor

0.4 · 10Angular acceleration of rotor≤ 1.0 · 105 rad/s2

Axial motion of measured shaft≤ ±0.5 mm–60.002 Nm (at 20 °C)

kgm2

Natural frequency of stator coupling ≥ 1000 Hz
Vibration 55 Hz to 2000 Hz
Shock 6 ms2≤ 200 m/s (EN 60068-2-6); 10 Hz to 55 Hz, 3.2 mm constant peak to peak
≤ 2000 m/s2 (EN 60068-2-27)

Operating temperature–40 °C to 95 °C

Trigger threshold for exceeded
temperature error message

125 °C (measurement accuracy of the internal temperature sensor: ±7 K at 125 °C)

Relative humidity≤ 93 % (40 °C/21 d as per EN 60068-2-78), without condensation

Protection EN 60529

IP40 (read about insulation under Electrical safety in the Interfaces of HEIDENHAIN Encoders
brochure; contamination from the ingress of liquid must be prevented)

Mass 0.1 kg

ID number

1211015-021)

For use at: ≤ 1000 m above sea level
Further tolerances may arise in subsequent electronics after position
value comparison (contact mfr. of subsequent electronics)
3)
Information from Siemens as per the document “Certified encoders
with DRIVE-CLiQ Dependencies on SIMOTION / SINUMERIK andSINAMICS Hardware and Software versions” (version: 12/2018)2)

Product Information ECN 1123 S, EQN 1135 S   02/2020

1211017-02
4)

 he calculation time TIME_MAX_ACTVAL specifies the time
Tafter which a data transfer from the encoder to the control
can start within the current-regulator clock time.
5)See Temperature measurement in motors in the Encoders
for Servo Drives brochure.
6)
At ≥ 2 position requests per revolution

3Mounting

The blind hollow shaft of the rotary encoder is seated onto the measured shaft andfastened with a central screw. It is particularly important to ensure that the positive-locking
element of the rotary encoder shaft securely engages the corresponding slot in themeasured shaft. Mounting on the stator side is performed without a centering collar on aflat surface with two clamping screws. Use screws with material bonding anti-rotation
lock (see Mounting accessories).
For the customer-side mounting design, the material properties and conditions inaccordance with the General mechanical information in the Encoders for Servo Drives
brochure must be complied with. The materials specifications for aluminum and steel
apply both to the customer-side shaft and stator.

For the design of the mechanical fault exclusion for the shaft connection, the following
maximum torque Mmax must be taken into account:Mmax = 1.0 Nm
The customer’s mechanical design must ensure that the maximum torque Mmax occurringin the application can be transmitted.

Mounting accessories
ScrewsScrews (central screw, mounting screws) are not included in delivery and can be orderedseparately.
Screws1)

Quantity

ISO 4762-M3×22-8.8-MKL

ID 202264-65

Central screw for EQN 1135 ISO 4762-M3×35-8.8-MKL

ID 202264-66

ISO 4762-M3×10-8.8-MKLID 202264-87

Central screw for ECN 1123

Fastening screwfor flange1)

10 or 100

20 or 200

With coating for material bonding anti-rotation lock

Please note the information on screws from HEIDENHAIN in the Encoders for Servo
Drives brochure, under Screws with material bonding anti-rotation lock in the chapter
General mechanical information.
Mounting aid
To avoid damage to the cable, use the mounting aid to connect and disconnect the cable
assembly. The pulling force must be applied only to the connector and not to the wires.
ID 1075573-01
Mounting aid
The mounting aid allows the shaft of the rotary encoder to be turned from the rear of thedevice, making it easy to find the positive-locking connection between the encoder shaft
and the measured shaft.
ID 821017-03

4

Product Information ECN 1123 S, EQN 1135 S   02/2020

Integrated temperature evaluation

These rotary encoders feature a temperature sensor integrated
into the encoder electronics and an evaluation circuit for an
external temperature sensor. In both cases, the respective
digitized temperature value is transmitted purely serially via theDRIVE-CLiQ interface. Please bear in mind that neither thetemperature measurement nor the transmission of thetemperature value is safe in terms of functional safety.
The temperature measured by the internal temperature sensor ishigher by a device-specific and application-specific amount than
the temperature at measuring point M1, as shown in thedimension drawing.
Upon reaching a trigger threshold for the internal temperature
sensor, these rotary encoders issue an “Alarm 405” error message.
This threshold may vary depending on the encoder model and isstated in the specifications. During operation, it is recommended
that the temperature be kept adequately below this threshold.
Fulfillment of the encoder’s intended use requires adherence tothe operating temperature at measuring point M1.
The internal temperature sensor has an accuracy of ±7 K.

Product Information ECN 1123 S, EQN 1135 S   02/2020

Temperature measurement in motors
To protect a motor from overloading, the motor manufacturer
usually installs a temperature sensor in close proximity to themotor winding.
The PT 1000 or, for example, the KTY 84-130 semiconductor
sensor is to be used. For a PT 1000, the following values apply
with regard to the accuracy of the evaluation circuit:±4 K at 80 °C to 160 °C±6 K at –40 °C to 80 °C±6 K at 160 °C to 200 °C
For a KTY 84-130 semiconductor sensor, the following values apply
with regard to the accuracy of the evaluation circuit:±2 K at 80 °C to 160 °C±6 K at –40 °C to 80 °C±6 K at 160 °C to 200 °C
The temperature values are transmitted via the DRIVE‑CLiQ
protocol.
The temperature sensor used is adjustable via Parameter 601 in
the configuration software (e.g., Starter software) of the drive.

5Online diagnostics and firmware version

Online diagnostics
For evaluation of the encoder’s functionality, valuation numbers
can be cyclically read from the encoder. These valuation numbers
reflect the current status of the encoder and can be used todetermine its function reserves. The function reserves are alsotransmitted via the DRIVE-CLiQ interface and can be displayed in
the higher-level control.
Further information is available from HEIDENHAIN upon request.
Firmware version
The firmware version can be read out over the DRIVE-CLiQ
parameter “Act_FW_Version” (index 0). The final two digits of thedisplayed value are decisive.

6Product Information ECN 1123 S, EQN 1135 S  

02/2020

Electrical connection

Cables
EPG encoder cable inside the motor ¬ 3.7 mm; 2 × (2 × 0.06 mm2 ) + 4 × 0.06 mm2; AP = 0.06 mm2With shield crimping (¬ 4.3 mm) and wires for a temperature sensor1) TPE 2 × 0.16 mm2With 15-pin PCB connector and 8-pin LK28
M12 flange socket (male)2)
1)
2)

ID 1217143-xx

Electromagnetic compatibility must be ensured in the complete system.
The shield connection must be implemented on the motor side.

Pin layout
8-pin
M12 flange
socket15-pin
PCB connector

Power supplyM12151)
2)

1)

Serial data transmission

Other signals

82513476//

131114

12789105

6––0V

UPRXP

RXN

TXP

TXNT+2)

T–2)

Brown/
GreenBlueWhite/
GreenWhite

Gray

Pink

VioletYellowBrown

Green

Only with output cables inside the motor housing
Connections for an external temperature sensor; evaluation optimized for a KTY 84-130 (see Temperature measurement in motors
in the Encoders for Servo Drives brochure

Cable shield connected to housing; UP = Power supply voltage
Sensor: The sense line is connected in the encoder with the corresponding power supply line.
Vacant pins or wires must not be used!
Output cables with a cable length > 0.5 m require strain relief for the cable.
DRIVE-CLiQ is a registered trademark of SIEMENS AG.

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1255655 · 02 · A · 02 · 02/2020 · PDF

This Product Information document supersedes all previous editions, which thereby
become invalid. The basis for ordering from HEIDENHAIN is always the Product
Information document edition valid when the order is made.
Further information:
Comply with the requirements described in the following documents to ensure correctand intended operation:• Brochure: Encoders for Servo Drives
208922-xx• Brochure: Interfaces of HEIDENHAIN Encoders
1078628-xx• Mounting Instructions: ECN 1123 S, EQN 1135 S
1254938-xx• Brochure: Cables and Connectors
1206103-xx