Rockwell Automation 1760-xxxx Pico Controller User Manual - Manual (Page 181)

Publication 1760-UM001D-EN-P - September 2005
Use of Expansion Modules 9-3
Monitor Functions of the Expansion Module
Be Sure Power Supply is Present
If the power supply of the expansion module is not present, no
connection can be established between it and the Pico controller.
When no power supply is present, the expansion inputs, R1 to R12
and R15 and R16, are incorrectly processed in the Pico controller and
show status of 0. Also, it cannot be assured that outputs S1 to S8 will
be transferred to the expansion module.
Expansion Module Status
The status of the Pico controller internal input I14 indicates the status
of the expansion module, as follows:
ATTENTION
Always monitor the expansion module to prevent
switching faults in machines or systems.
Expansion Module Status
Pico Controller Input Status
I14 = 0 Expansion module is functional.
I14 = 1 Expansion module is not functional.