Publication 1734-UM001D-EN-P - April 2008
154 Troubleshoot with the Indicators
Troubleshoot I/O
Communication Modules
The status indicators on the communication modules provide system power
and DeviceNet power indications.
1734-PDN DeviceNet Communication Interface Module
System Power
DeviceNet Power
Indicator Indication Probable Cause Recommended Action
System Power Off • Device is not active.
• DeviceNet power is off, or
dc-dc converter problem is
present.
1. Verify DeviceNet power is on, and apply power if needed.
2. Verify backplane power not exceeded, and correct, as needed.
3. Replace 1734-PDN module.
Green • System power is on.
• dc-dc converter is active
(5V).
None.
DeviceNet Power Off • Device is not active.
• DeviceNet power is off.
Apply DeviceNet 24V power.
Green Power is on with 24V present. None.
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