38 Rockwell Automation Publication 1756-UM013B-EN-P - October 2019
Chapter 2 Features Common to 1756 ControlLogix Digital Safety I/O Modules
Input Module Compatibility
Digital safety input modules interface to sensing devices and detect whether they
are On or Off.
These input modules convert DC On/Off signals from user devices to
appropriate logic level for use in the controller. Typical input devices include:
•Proximity switches
• Limit switches
• Selector switches
• Float switches
• Push button switches
When you design systems with a digital safety input module, consider these
factors:
• Voltage necessary for your application
• Current leakage
• Whether you need a solid-state device
• Whether your application uses sinking or sourcing wiring
Output Module
Compatibility
You can use a digital safety output module to drive output devices. Typical
devices compatible with these output modules include:
• Motor starters
• Solenoids
•Indicators
When you design systems with a digital safety output module, follow these
guidelines:
• Make sure that the output modules can supply the necessary surge and
continuous current for proper operation.
• Make sure that the surge and continuous current are not exceeded.
Damage to the module could result.
When you size output loads, refer to the documentation supplied with the output
device for the surge and continuous current necessary to operate the device.
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