Rockwell Automation 1756-XXXX ControlLogix Digital I/O Modules - Manual (Page 74)

74 Rockwell Automation Publication 1756-UM058G-EN-P - November 2012
Chapter 4 Diagnostic Module Features
Field Power Loss Detection
For the standard digital output modules, the Field Power Loss detection feature is
found on the 1756-IA8D module only. When field power to the module is lost,
or zero cross cannot be detected, a point-level fault is sent to the controller to
identify the exact point faulted.
This feature has a corresponding tag that can be examined in the user program in
the event of a fault. For information on these tags, see
Chapter A .
Follow these steps to enable or disable diagnostics for field power loss.
1. On the Module Properties dialog box, click the Configuration tab.
2. Do one of the following in the Enable Diagnostics for Field Power Loss
column:
•
To enable field power loss detection for a specific point, check the
corresponding checkbox.
• To disable field loss detection for a specific point, clear the
corresponding checkbox.
3. Click OK.
IMPORTANT Only enable Field Power Loss detection for points that are in use. If this feature
is enabled for points that are not in use, you will receive faults for those points
during operation.