Rockwell Automation 1746-FIO4V SLC 500 Fast Analog I/O/ User Manual - Manual (Page 38)

Publication 1746-UM009B-EN-P - September 2007
38 Processor and Module Considerations
Input Response to Slot Disable
The module continues to update its inputs for transfer to the
processor, but the processor:
• does not read inputs from the module in a disabled slot.
• retains the last-state input image table values.
• upon re-enabling the slot, reads current inputs in the subsequent
scan.
Output Response to Slot Disable
While the module holds its outputs in their last state, the processor:
• may update its output image table.
• does NOT transfer output image table values to the module.
• upon re-enabling, transfers the current output image in the
subsequent scan.
Safe State for Outputs
Whenever an SLC 500 system is not in RUN mode, the analog
module’s outputs are automatically forced to 0V or 0 mA by the
SLC 500 system. This occurs when the processor is in one of the
following modes:
• Fault
• Program
• Test
Module ID Code
You must enter the ID code if your programming software does not
include the subject I/O module in its list of modules.
ID code for FIO4I is 3224
ID code for FIO4V is 3218
ATTENTION
When designing and installing the SLC 500 system, place
devices connected to analog output channels in a safe state
whenever the analog output is zero (± the offset error).
Determine which output conditions must be held ON for a safe
state.