Rockwell Automation Publication 750-IN100B-EN-P - July 2017 165
I/O Wiring Chapter 6
Integrated Safety - Safe
Torque Off Option Module
The integrated safety - safe torque off option module is just one component in
a safety control system. Components in the system must be chosen and applied
appropriately to achieve the desired level of operational safety. For detailed
information on applying this option, refer to the PowerFlex 755 Integrated
Safety - Safe Torque Off User Manual, publication 750-UM004
.
Cabling
Safety input wiring must be protected against external damage by cable
ducting, conduit, armored cable, or other means.
Shielded cable is required. For proper shield termination, follow the
installation requirements that are related to EN 61800-3 and the EMC
Directive as described in this publication.
Power Supply Requirements
The external power supply must conform to the Low Voltage Directive 2006/
95/EC, by applying the requirements of EN61131-2 Programmable
Controllers, Part 2 - Equipment Requirements and Tests, and one of the
following:
• EN60950 - SELV (Safety Extra Low Voltage)
• EN60204 - PELV (Protective Extra Low Voltage)
• IEC 61140 Safety Class III (SELV or PELV)
• UL 508 Limited Voltage/Current Circuit
20-750-S3
Table 39 - TB2 Terminal Designations
Terminal Name Description
Si0 Safety input 0 Safety input 0
SC Safety common Safety power common
Si1 Safety input 1 Safety input 1
SC Safety common Safety power common
SP Safety power +24 volt from customer-supplied SELV/PELV safety power
Safety Input Connection Example
Power Supply
IMPORTANT The National Electrical Code and local electrical codes take precedence over
the values and methods provided.
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