Manual

332 Publication 1756-UM009C-EN-P - December 2010
Appendix B Analog I/O Tag Definitions
Ch0Overrange BOOL All inputs Alarms bit indicating the channel’s input is greater than the maximum
detectable input signal.
Ch0RateAlarm BOOL All inputs Alarm bit that sets when the input channel’s rate of change exceeds the
configured Ch0ConfigRateAlarmLimit. Remains set until the rate change drops
below the configured limit unless latched via Ch0ConfigRateAlarmLatch in
the configuration.
Ch0LAlarm BOOL All inputs Low alarm bits that sets when the input signal moves beneath the configured
low alarm trigger point, Ch0ConfigLAlarmLimit. Remains set until the input
signal moves above the trigger point, unless latched via
Ch0ConfigProcAlarmLatch or the input is still within the configured alarm
deadband, Ch0ConfigAlmDeadband, of the low alarm trigger point.
ChOHAlarm BOOL All inputs High alarm bit that sets when the input signal moves above the configured
high alarm trigger point, Ch0ConfigHAlarmLimit. Remains set until the input
signal moves below the trigger point, unless latched
viaCh0ConfigProcAlarmLatch or the input is still within the configured alarm
deadband, Ch0ConfigAlmDeadband, of the high alarm trigger point.
Ch0LLAlarm BOOL All inputs Low low alarm bit that sets when the input signal moves beneath the
configured low low alarm trigger point, Ch0ConfigLLAlarmLimit. Remains set
until the input signal moves above the trigger point, unless latched via
Ch0ConfigProcAlarmLatch or the input is still within the configured alarm
deadband, Ch0ConfigAlmDeadband, of the low low alarm trigger point.
CH0HHAlarm BOOL All inputs High high alarm bit that sets when the input signal moves above the
configured high high alarm trigger point, Ch0ConfigProcAlarmLimit. Remains
set until the input signal moves below the trigger point, unless latched via
Ch0ConfigAlmDeadband, of the high high alarm trigger point.
Ch0Data REAL All inputs The channel input signal represented in engineering units. The input signal is
measured and then scaled based on the user configuration.
CJData REAL 1756-IT6I and
1756-IT6I2
The cold junction sensor temperature in °C or °F.
CSTTimestamp Array of
DINT
All (if the CST
connection is
selected)
Timestamp taken at time the input data was sampled, or if an output when the
output was applied, and placed in terms of coordinated system time that is a
64-bit quantity in microseconds coordinated across the rack. Must be
addressed in 32-bit chunks as an array.
RollingTimestamp INT All inputs Timestamp taken at time the input data was sampled, or if an output when the
output was applied, which is in terms of milliseconds relative solely to the
individual module.
Floating Point Input Tags
Tag Name Data Type Applicable
Modules
Definition