Rockwell Automation 1797-OE8 FLEX Ex Analog Modules User Manual - Manual (Page 55)

Publication 1797-6.5.1 - May 2005
Input, Output, and Configuration Files for the Analog I/O Modules on the ControlNet Network 4-7
Communication Fault Behavior
You can configure the adapter response to a communication fault for
each I/O module in its system. Upon detection of a communication fault,
the adapter can:
• leave the module output data in its last state (hold last state)
• reset the module output data to zero (reset)
• apply fault state data to the module output
Idle State Behavior
The ControlNet Ex adapter can detect the state of the controlling processor or
scanner. Only 2 states can be detected: run mode, or program mode (idle).
When run mode is detected, the adapter copies the output data received from
the processor to the corresponding module output. When program mode is
detected, the adapter can be configured to:
• leave the module output data in its last state (hold last state)
• reset the module output data to zero (reset)
• apply fault state data to the module output
If the Output Enable bit transitions from 1 to 0 (by resetting the module
output data or applying fault state data), the module uses internal analog or
digital fault state bits, depending on user configuration, to determine the
state of the outputs.
IMPORTANT
If the Output Enable bit transitions from 1 to 0 (by
resetting the module output data or applying fault state
data), the module uses internal analog or digital fault state
bits, depending on user configuration, to determine the
state of the outputs.