Product Information

ROC 425
ROQ 437
Absolute Rotary Encoders
with EnDat 2.2 for
Safety-Related Applications

05/2019

ROC 425, ROQ 437 with synchro flange
Rotary encoders for absolute position values with safe singleturn information• Rotary encoders for separate shaft coupling• 01C synchro flange• 92A solid shaft with flat

Required mating dimensions

A = Encoder bearing
M1 = Measuring point for operating temperature
M2 = Measuring point for vibration; see also D 741714
1 = M4 – 8.8 screw with material bonding anti-rotation lock; tightening torque: 2.65 Nm ±0.1 Nm; minimum engagement depth: 6 mm
2 = At a permissible interface face pressure PG of  280 N/mm2, use a washer
3 = For material characteristics, see the table on the “Mounting” page
4 = Direction of shaft rotation for ascending position values
5 = Connector coding

2

Product Information ROC 425, ROQ 437   05/2019

Specifications

ROC 425 – singleturn

ROQ 437 – multiturn

Functional safety
for applications with up toAs single-encoder system for monitoring functions• SIL 1 as per EN 61508 (further basis for testing: EN 61800-5-2)• Category 2, PL c as per EN ISO 13849-1:2015
As single-encoder system for 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 the singleturn range

PFH 10 · 10–9 (probability of dangerous failure per hour)

Safe position1)

Device: ±1.76° (safety-relevant measuring step: SM = 0.7°); mechanical coupling: ±0°(fault exclusion for stator coupling and shaft breakage, designed for accelerations of ≤ 300 m/s2 )Interface

EnDat 2.2

Ordering designation

EnDat22

Position values per revolution

33 554 432 (25 bits)

Revolutions–Calc. time tcal/clock frequency

 7 µs /  8 MHz

System accuracy±20”

Electrical connection**

8-pin M12 radial* or axial flange socket (male), or 1 m PUR cable with 8-pin M12 coupling (male)

Cable length 100 m (see EnDat description in the Interfaces of HEIDENHAIN Encoders brochure)Supply voltage

DC 3.6 V to 14 V

4096 (12 bits)

4)

Power consumption2)(maximum) At 3.6 V:  600 mW; at 14 V:  700 mW

At 3.6 V:  700 mW; at 14 V:  800 mW

Current consumption (typical)

5 V: 85 mA (without load)

5 V: 105 mA (without load)

Shaft

92A solid shaft ¬ 6 mm with flatSpeed 15 000 rpm

Starting torque (typical)

0.01 Nm (at 20 °C)

Moment of inertia of rotor

2.9 · 10–6 kgm2

Angular acceleration of rotor 1 · 10–5 rad/s2

Shaft load

Axial:  40 N; radial:  60 N at shaft end

Vibration 55 Hz to 2000 Hz
Shock 6 ms

≤ 300 m/s2 (EN 60068-2-6); 10 Hz to 55 Hz constant over 4.9 mm peak to peak
≤ 2000 m/s2 (EN 60068-2-27)

Min. operating temperature

Flange socket or fixed cable: –40 °C; moving cable: –10 °C3)

Max. operating temp.

 12 000 rpm

100 °C

Trigger threshold of temperature 125 °C in the scanning ASIC (measuring accuracy of the internal temperature sensor: ±4 K)
exceedance error message
Relative humidity≤ 93 % (40 °C/21 d as per EN 60068-2-78), without condensation

Protection3) EN 60529

Housing: IP67; shaft inlet: IP64 (read about isolation under Electrical safety in the Interfaces ofHEIDENHAIN Encoders brochure; contamination from the ingress of liquids must be avoided)Mass 0.3 kg

Valid for ID

1042256-01* / 1042256-02

1042255-01* / 1042255-02* This preferred version is available on short notice1)** Please select when ordering
Further tolerances may apply in subsequent electronics after position value comparison (contact manufacturer of subsequent electronics)
2)
See General electrical information in the Interfaces of HEIDENHAIN Encoders brochure3)
For relationship of operating temperature/shaft speed/supply voltage, see General mechanical information in the Rotary Encoders brochure4)	Cable outlet with cable length of > 0.5 m requires strain relief for the cable. Flange socket versions may be used only with plasticinsulated M12 mating connectors

Product Information ROC 425, ROQ 437   05/2019

3

ROC 425, ROQ 437 with clamping flange
Rotary encoders for absolute position values with safe singleturn information• Rotary encoders for separate shaft coupling• 03C clamping flange• 03D solid shaft with flat

Required mating dimensions

A = Encoder bearing
M1 = Measuring point for operating temperature
M2 = Measuring point for vibration; see also D 741714
1 = M4 – 8.8 screw with material bonding anti-rotation lock; tightening torque: 2.65 Nm ±0.1 Nm; minimum engagement depth: 6 mm
2 = At a permissible interface face pressure PG of  280 N/mm2, use a washer
3 = For material characteristics, see the table on the “Mounting” page
4 = Direction of shaft rotation for output signals in accordance with the interface description
5 = Connector coding

4

Product Information ROC 425, ROQ 437   05/2019

Specifications

ROC 425 – singleturn

ROQ 437 – multiturn

Functional safetyfor applications with up toAs single-encoder system for monitoring functions• SIL 1 as per EN 61508 (further basis for testing: EN 61800-5-2)• Category 2, PL c as per EN ISO 13849-1:2015
As single-encoder system for 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 the singleturn range

PFH 10 · 10–9 (probability of dangerous failure per hour)

Safe position1)

Encoder: ±1.76° (safety-related measuring step: SM = 0.7°); mechanical coupling: ±0°(fault exclusion for stator coupling and shaft breakage, designed for accelerations of ≤ 300 m/s2)

Interface

EnDat 2.2

Ordering designation

EnDat22

Position values per revolution

33 554 432 (25 bits)

Revolutions–Calc. time tcal/clock frequency

 7 µs /  8 MHz

System accuracy±20”

Electrical connection**

8-pin M12 radial* or axial flange socket (male), or 1 m PUR cable with 8-pin M12 coupling (male)

Cable length 100 m (see the EnDat description in the Interfaces of HEIDENHAIN Encoders brochure)Supply voltage

DC 3.6 V to 14 V4096 (12 bits)

4)

Power consumption2)(maximum) At 3.6 V:  600 mW; at 14 V:  700 mW

At 3.6 V:  700 mW; at 14 V:  800 mW

Current consumption (typical)

5 V: 85 mA (without load)

5 V: 105 mA (without load)

Shaft

03D solid shaft ¬ 10 mm with flat

Speed

 15 000 rpm

Starting torque (typical)

0.01 Nm (at 20 °C)

Moment of inertia of rotor

2.9 · 10–6 kgm2

Angular acceleration of rotor 1 · 10–5 rad/s2

Shaft load

Axial:  40 N; radial:  60 N at shaft end

Vibration 55 Hz to 2000 Hz
Shock 6 ms

≤ 300 m/s2 (EN 60068-2-6); 10 Hz to 55 Hz constant over 4.9 mm peak to peak
≤ 2000 m/s2 (EN 60068-2-27)

Min. operating temperature

Flange socket or fixed cable: –40 °C; moving cable: –10 °C3)

Max. operating temp.

 12 000 rpm

100 °C

Trigger threshold of temperature 125 °C in the scanning ASIC (measuring accuracy of the internal temperature sensor: ±4 K)
exceedance error message
Relative humidity≤ 93 % (40 °C/21 d as per EN 60068-2-78), without condensation

Protection3) EN 60529

Housing: IP67; shaft inlet: IP64 (read about isolation under Electrical safety in the Interfaces ofHEIDENHAIN Encoders brochure; contamination from the ingress of liquids must be avoided)

Mass 0.3 kg

Valid for ID

1042257-01* / 1042257-02 / 1042257-03* This preferred version is available on short notice1)

1042258-01* / 1042258-02** Please select when ordering

Further tolerances may apply in subsequent electronics after position value comparison (contact manufacturer of subsequent electronics)
See General electrical information in the Interfaces of HEIDENHAIN Encoders brochure3)
For relationship of operating temperature/shaft speed/supply voltage, see General mechanical information in the Rotary Encoders brochure4)	Cable outlet with cable length of > 0.5 m requires strain relief for the cable. Flange socket versions may be used only with plasticinsulated M12 mating connectors
2)

Product Information ROC 425, ROQ 437   05/20195

Mounting

The rotary encoders are centered bymeans of the centering collar of thesynchro flange or clamping flange andare secured with screws at their front.
Mechanical fault exclusion can be ensured
only when fastening is accomplished withthree M4 screws with strength class 8.8
and at a minimum engagement depthof 6 mm in the rotary encoder flange.
The screws are not included in delivery.
The machine designer is responsible for
specifying a material bonding anti-rotation
lock for the screws depending on theapplication.

Fault exclusion was calculated based ona material bonding anti-rotation lock witha thread friction coefficient of between
0.1 and 0.16. The clearance holes for thescrews must be designed in accordancewith EN 20273 (medium). The washers arerequired for materials with permissible
interface pressures of ≤ 280 N/mm2.
Rotary encoderwith synchro
flangeRotary encoderwith clampingflange

At variance with the standard specifications in the rotary encoders brochure, the following
customer-side requirements are permissible for the safe mechanical coupling:
SteelAluminum

For the design of the mechanical fault
exclusion for the shaft connection, thefollowing maximum torque Mmax must beconsidered:

Coefficient of thermal expansionÞtherm10 · 10–6 K–1 to
14 · 10–6 K–1≤ 25 · 10–6 K–1

Mmax = 1 Nm

Thickness of the mounting flange

4 mm to 20 mm

5 mm ±1 mm

The customer’s mechanical design mustensure that the maximum torque Mmax
occurring in the application can betransmitted. Cables with a length of morethan 0.5 m must be provided with strain
relief.

Further information:
For mounting information and mounting
aids, see the mounting instructions in
the Rotary Encoders brochure.

6Product Information ROC 425, ROQ 437   05/2019

Integrated temperature evaluation

These rotary encoders feature an internal
temperature sensor integrated into theencoder electronics. The digitalized
temperature value is transmitted purely
serially over the EnDat protocol. Note thatthe measurement and transfer of thetemperature is not performed safely interms of functional safety.
With regard to the internal temperature
sensor, the rotary encoder supports
the two-stage cascaded signaling of atemperature exceedance. This consists ofan EnDat warning and an EnDat error
message.
In compliance with the EnDat specification,
when the temperature reaches the warning
threshold for the temperature exceedanceof the internal temperature sensor, anEnDat warning is issued (EnDat memoryarea for operating status, word 1 –warning, bit 2 1 – temperature exceeded).
This warning threshold for the internal

temperature sensor is stored in the EnDat
memory area for operating parameters,
word 6 – threshold sensitivity warning bit
for exceeded temperature, and can beindividually adjusted. A product-specificdefault value is saved here before shipping.
The temperature measured by the internal
temperature sensor is higher by a deviceand application-specific amount than thetemperature at measuring point M1 inaccordance with the dimension drawing.

HEIDENHAIN recommends setting thewarning threshold for the specific applicationsuch that it lies sufficiently below thetrigger threshold for the EnDat temperature
exceedance error message. The encoder’sintended use requires compliance withthe operating temperature at measuring
point M1.

The encoder features a further, albeit nonadjustable, trigger threshold of the internal
temperature sensor, which, when exceeded,
triggers an EnDat error message (EnDatmemory area for operating status, word 0 –error messages, bit 2 2 – position, and in
additional data 2 operating status error
sources, bit 2 6 – temperature exceeded).
This trigger threshold depends on theencoder model and is provided in thespecifications.

Product Information ROC 425, ROQ 437   05/2019

7Electrical connection

Cables
PUR connecting and adapter cables ¬ 6 mm; (4 × 0.14 mm2) + (4 × 0.34 mm2); AP = 0.34 mm2
8-pin M12 connector (female) and
8-pin M12 coupling (male)

ID 368330-xx

8-pin M12 connector (female) and15-pin D-sub connector (female)

ID 533627-xx

8-pin M12 connector (female) and15-pin D-sub connector (male)

ID 524599-xx

8-pin M12 connector (female)and free cable end (stripped)

ID 634265-xx1)

AP: Cross section of power supply lines1)
Connecting element must be suitable for the maximum clock frequency used
Note for safety-related applications: Provide the bit error rate in accordance with specification document 533095!

Pin layout
8-pin M12 couplingPower supply

Serial data transfer

8251

3476UP

Sensor UP0V

Sensor 0 VDATA

DATA

CLOCK

CLOCK

Brown/GreenBlue

White/GreenWhite

Gray

Pink

VioletYellow

Cable shield connected to housing; UP = Power supply voltage
Sensor: The sense line is connected in the encoder with the corresponding power line.
Vacant pins or wires must not be used!
Note for safety-related applications: Only completely assembled HEIDENHAIN cables are qualified. Do not modify cables or exchange
their connectors without first consulting with HEIDENHAIN Traunreut!

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1035608 · 04 · A · 02 · 05/2019 · 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:
To ensure proper and intended use, comply with the specifications in the following
documents:
249529-xx• Brochure: Rotary Encoders• Brochure: Interfaces of HEIDENHAIN Encoders
1078628-xx• Brochure: Cables and Connectors
1206103-xx• Mounting instructions: ROC 425, ROQ 437 (synchro flange)
1030782-xx• Mounting instructions: ROC 425, ROQ 437 (clamping flange)
1030781-xx• Technical Information document:
596632-xx
Safety-Related Position Measurement Systems• For implementation in a safe control or inverter: Specification document 533095-xx