274 Rockwell Automation Publication 750-IN001P-EN-P - April 2017
Chapter 5 I/O Wiring
Table 85 - TB2 Terminal Designation
Cabling
• Safety input wiring must be protected against external damage by cable
ducts, 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 Directive 2006/95/EC
Low Voltage, 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 60536 Safety Class III (SELV or PELV)
– UL 508 Limited Voltage Circuit
– 24V DC ±10% must be supplied by a power supply that complies
with IEC 60204 and IEC 61558-1.
• For more information, see the guidelines in Industrial Automation
Wiring and Grounding Guidelines, publication 1770-4.1
.
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 +24V DC 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.
Integrated Safety - Safe Torque Off Option Module
(catalog number 20-750-S3)
TB2
These tabs are only for
Rockwell Automation
use.
SiO
SC
Si1
SC
SP
24V DC
SELV/PELV
Supply
Safety Input 0
Safety Common
Safety Input 1
Safety Common
Safety Power
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