Device-defined input tags (floating point)

The set of tags associated with a device depends on the device type and the communication format. For each operational mode, integer or floating point, there are three sets of tags:
  • Input
  • Output
  • Configuration
This table includes the input tags for 1756 analog input devices operating in floating point mode.
Member Name (as listed in Tag Editor)
Data Type
Description
ChannelFaults
INT
Channel Faults
- A collection of individual channel indicators. For example, ChannelFaults.3 for channel 3.
Ch0Fault
BOOL
An ordered status of faults that indicates that a point is faulted and input data may be incorrect. Check other diagnostic faults, if they are available, for further diagnosis of the root cause. If communication to the input device is lost, then all points for a device are faulted.
  • 0 = No fault
  • 1 = Fault (calibration is ongoing, a low or high clamp condition is occurring, or a wire off condition has occurred on a non-isolated output device)
ModuleFaults
INT
Module Faults
- A collection of all device-level fault members.
AnalogGroupFault
BOOL
Analog Group Fault
- Indicates if a channel fault occurred on any channel.
Calibrating
BOOL
Indicates if a calibration is currently in progress on any channel.
CalFault
BOOL
Calibration Fault
- Indicates if any channel has a bad calibration. Bad calibration means the last attempt to calibrate the channel failed with an error and was aborted.
Ch0Status
INT
Status
- Collection of individual channel status bits.
Ch0CalFault
BOOL
Channel Calibration Fault
- Status indicating if the channel has a bad calibration. Bad calibration means the last attempt to calibrate the channel failed with an error and was aborted.
Ch0Underrange
BOOL
Underrange
- Alarm indicating the channel’s input is less than the minimum detectable input signal.
Ch0Overrange
BOOL
Overrange
- Alarm indicating the channel’s input is greater than the maximum detectable input signal.
Ch0RateAlarm
BOOL
Rate Alarm
- Alarm that is set when the input channel’s rate of change exceeds the configured Ch0Config.RateAlarmLimit. The alarm remains set until the rate change drops below the configured limit unless it is latched by Ch0Config.RateAlarmLatch in the configuration.
Ch0LAlarm
BOOL
Low Alarm
- Alarm that is set when the input signal moves below the configured low alarm trigger point, Ch0Config.LAlarmLimit. The alarm remains set until the input signal moves above the trigger point unless it is latched by Ch0Config.ProcAlarmLatch or the input is still within the configured alarm deadband, Ch0Config.AlarmDeadband, of the low alarm trigger point.
Ch0HAlarm
BOOL
High Alarm
- Alarm that is set when the input signal moves above the configured high alarm trigger point, Ch0Config.HAlarmLimit. The alarm remains set until the input signal moves below the trigger point unless it is latched by Ch0Config.ProcAlarmLatch or the input is still within the configured alarm deadband, Ch0Config.AlarmDeadband, of the high alarm trigger point.
Ch0LLAlarm
BOOL
Low Low Alarm
- Alarm that is set when the input signal moves beneath the configured low low alarm trigger point, Ch0Config.LLAlarmLimit. The alarm remains set until the input signal moves above the trigger point unless it is latched by Ch0Config.ProcAlarmLatch or the input is still within the configured alarm deadband, Ch0Config.AlarmDeadband, of the low low alarm trigger point.
Ch0HHAlarm
BOOL
High High Alarm
- Alarm that is set when the input signal moves above the configured high high alarm trigger point, Ch0Config.HHAlarmLimit. The alarm remains set until the input signal moves below the trigger point unless it is latched by Ch0Config.ProcAlarmLatch or the input is still within the configured alarm deadband, Ch0Config.AlarmDeadband, of the high high alarm trigger point.
Ch0HLimitAlarm
BOOL
High Limit Alarm
- Alarm that is set when the requested output value, Ch0Data, is above the configured high limit, Ch0Config.HighLimit. The output stops at the configured high limit, which the echo reflects. The alarm remains set until the requested output moves below the high limit unless it is latched by Ch0Config.LimitAlarmLatch.
Ch0Data
REAL
Input channel value that reflects the current signal read from the terminals and scaled into the configured engineering units for the channel.
CJData
REAL
Cold Junction Data
- The cold junction sensor temperature in degrees Celsius or Fahrenheit.
CSTTimestamp[ ]
Array of DINT
Coordinated System Time Timestamp
- Timestamp taken at time the input data was sampled (or, if an output, when the output was applied) in terms of microseconds relative to the backplane. Must be addressed in 32-bit chunks as an array
RollingTimestamp
INT
Rolling Timestamp
- Timestamp taken at time the input data was sampled (or, if an output, when the output was applied) in terms of milliseconds relative to the individual device. Value ranges 0...32,767 ms.
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