Rockwell Automation Publication 1756-UM058G-EN-P - November 2012 67
Chapter 4
Diagnostic Module Features
Diagnostic modules provide additional reporting information to the controller,
such as a timestamp of the time a module fault occurs or clears, no load detection,
and pulse tests. The table lists the available diagnostic digital I/O modules.
Diagnostic Input
Module Compatibility
When designing systems with ControlLogix diagnostic input modules, consider
these factors:
• Voltage necessary for your application
• Current leakage
• Whether you need a solid state device
• Whether your application should use sinking or sourcing wiring
Topic Page
Diagnostic Input Module Compatibility 67
Diagnostic Output Module Compatibility 68
Diagnostic Features 68
Features Specific to Diagnostic Input Modules 71
Features Specific to Diagnostic Output Modules 75
Fault and Status Reporting between Input Modules and Controllers 79
Fault and Status Reporting between Output Modules and Controllers 81
Cat. No. Description
1756-IA8D 79…132V AC 8-point diagnostic input module
1756-IB16D 10…30V DC diagnostic input module
1756-OA8D 74…132V AC 8-point diagnostic output module
1756-OB16D 19.2…30V DC 16-point diagnostic output module
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