DF1 Master Priority Poll Error
Allen-Bradley · Compact 5000 I/O Serial Module
What does I x .DF1Master.PriorityPollError mean?
This boolean tag for DF1 Master module 'x' indicates that an error occurred during a priority polling cycle. A value of 1 signifies that the priority poll did not complete successfully, potentially disrupting critical, time-sensitive data exchange with a high-priority slave device.
Common Causes
- No response received from the polled priority node within the configured communication timeout period.
- Invalid or malformed response received from the priority node.
- Communication interference or excessive noise on the DF1 channel preventing reliable data transmission.
- Priority slave device address configured incorrectly or not powered on.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Verify the configured address of the Priority Poll Node (e.g., in the `Ox.DF1Master.PriorityPollNode` array) matches the physical address of the slave device.
- 2
Check communication settings for DF1 Master channel 'x', including baud rate, parity, and stop bits, to ensure they match all connected slave devices.
- 3
Ensure the priority slave device is powered, operational, and properly connected to the DF1 network.
- 4
Measure signal integrity on the DF1 bus for channel 'x' to detect excessive noise or signal degradation.