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Monitor Channel Status
Bits
This example shows how you could monitor the open-circuit error bit
of each channel and set an alarm bit if the module detects an open
input. An open-circuit error can occur if a thermocouple or CJC
thermistor wire breaks or becomes disconnected from the terminal
block.
In this example, we monitor the channel enable bit (bit 11) and the
open-input bit (bit 12) in channel status words I:3.4 through I:3.7, and
use output image bits O:2.0/0...3 as alarm bits.
If a CJC thermistor is not installed or is damaged, all four
IMPORTANT
alarms are set, and all four channel LEDs blink.
Ladder Programming Examples
Publication 1746-UM614B-EN-P - September 2007
63
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