Allen-Bradley FLEX I/O 1794-IP4, Руководство пользователя, Страница: 57 / 70

6–5 Input, Output and Configuration Files for Analog Modules when used with ControlNet
Publication 1794-6.5.16 – September 1998
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 safe state data to the module output
Idle State Behavior
The ControlNet 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 safe state data to the module output
Input Data Behavior upon Module Removal
I/O module input data sent by the adapter upon module removal is
configurable. The adapter can:
•
reset the module output data to zero (reset)
•
leave the module output data in the last state before module
removal (hold last state)
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