ProcessLogix and ControlLogix System Redundancy Module 15
Publication
1757-IN092E-EN-P - November 2007
Using the 1757-SRM Module Relay Terminals
The user relay is available only on the 1757-SRM series B module. The relay
will energize when the module determines that it is in a primary control
chassis. The relay has these three terminals:
• Normally Open (NO)
• Normally Open Contact (NC)
• Chassis Ground Terminal (GND)
Normally Open
The Normally Open contact is located on terminals 1 and 2. The contact is
closed when the relay is energized.
These are the user relay contact ratings:
• Maximum Switching Voltage = 30V dc
• Maximum Switching Current = 100 mA
Chassis Ground Terminal
Terminal 3 is connected to chassis ground. It is intended for use with a
shielded two-conductor cable for field wiring of the Normally Open
connection. Attach the shield to terminal 3. Leave the opposite end of the
shield unconnected. Refer to Specifications on page 30 for a cable listing.
ATTENTION
The line voltage source for the external dc power source to the SRM
Relay Terminals must be the same as that used to power the
energizing SRM Chassis.
1
2
3
Normally Open Contact
Shield termination/connection (Functional Earth)
Normally Open Contact
Allen-Bradley Parts
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