88 Rockwell Automation Publication ICSTT-RM448M-EN-P - February 2021
Chapter 5 Install the AADvance System
Assumptions:
• Loop supply voltage = 24V ± 10%
• Maximum Field Cable Line Resistance: < 100 total; this means < 50 + 50
for the two cables.
• Minimum Isolation is 0.75M between the field loop conductors.
• These values will allow the input to detect more accurately different
voltage levels that represent OPEN CCT - OFF - ON - SHORT CCT and
will also detect Over Voltage and an input which is neither ON nor OFF.
The values verify that a line fault will be declared before it becomes
possible for a false declaration of On and Off states due to a combination
of resistor value drift and loop voltage variation.
Range Value (mV)
Maximum Allowed = 32000
SHORT CIRCUIT
High = 19000
Low = 18500
ON (nominal 16V)
High = 11000
Low = 10500
INDETERMINATE
High = 6500
Low = 6000
OFF (nominal 8V)
High = 3500
Low = 3000
OPEN CIRCUIT
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