Rockwell Automation Publication 1732E-UM001A-EN-P - December 2019 35
Chapter 4
Diagnostic Properties
The module provides advanced diagnostic messages to identify device errors
during communication. The firmware of the module distinguishes between five
different types of errors.
Channel Error
A channel error is determined by comparing the target value set by a controller
and the actual value of an output channel.
When an output channel is activated (rising edge) or deactivated (falling edge),
the channel errors are filtered for the period of time set using the Fault Delay
parameter during the configuration of the module. The value of this parameter
ranges from 0…255 ms. The default value is 80 ms.
Topic Page
Channel Error 35
Voltage Errors at M12 Slots (Sensor Short-circuit) 36
Overload of Output Drivers 36
Error in Actuator Power Supply 36
Error in System/Sensor Power Supply 36
Table 20 - Description of Channel Errors
Target Value Actual Value Description
Active Active OK, no diagnostic
Off Off OK, no diagnostic
Active Off Short-circuit
• Channel indicator is red.
• Channel error bit in the diagnostic is set.
• Channel is locked after error is removed.
Off Active Voltage is fed back in
• Red and yellow/white channel indicators are activated.
• Channel error bit in the diagnostic is set.
• Channel is not locked after error is removed.
ATTENTION: If both output channels of an M12 slot are activated when a
channel error occurs, the controller locks both channels, even if only one
channel is affected by the error. If only one channel is activated, the controller
only locks this channel. Locked channels are deactivated and remain in the Off
state if you do not reset them using the controller.
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