User manual

Publication 1797-6.5.1 - April 1999
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
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.
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
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.