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Rockwell Automation Publication 1756-UM533C-EN-P - February 2011 187
Tag Definitions Appendix A
CurrentFault BOOL Decimal Analog current measurement does not match the current the field device reported over
the HART network.
ConfigurationChanged BOOL Decimal The field device configuration has changed and new field device configuration information can be
obtained from the 1756-OF8H module via CIP MSG GetDeviceInfo, which will clear this bit.
BrokenWire BOOL Decimal Indicates that current is not flowing through the module as expected. This might be caused by
broken wiring, RTB removal, or a powered-off field device.
HARTFault BOOL Decimal Indicates a problem with HART data from the field device on Channel x.
Examples are HART not enabled, HART device not connected, HART communication failure
due to noise.
The following field device status conditions also cause this to be set: Device Malfunction,
PV Out of Limits, Loop Current Saturated, and Loop Current Fixed.
ResponseCode SINT Binary HART communication status byte or Response code from a recent HART reply. See Response Code
and Field Device Status on page 195 for more information.
FieldDeviceStatus SINT Binary HART device status byte from a recent HART reply. Indicates the health of the HART field device.
See Field Device Status Bit Mask Definitions on page 196 for more information.
PVOutOfLimits BOOL Decimal The primary variable is beyond its operating limit.
VariableOutOfLimits BOOL Decimal A device variable not mapped to the PV is beyond its operating limits.
CurrentSaturated BOOL Decimal The loop current has reached its upper or lower endpoint limit and cannot increase or decrease
any further.
CurrentFixed BOOL Decimal The loop current is being held at a fixed value and is not responding to process variations.
MoreStatus BOOL Decimal More status information is available via command 48, ‘Read Additional Status’ information.
ColdStart BOOL Decimal A power failure or device reset occurred.
Changed BOOL Decimal An operation was performed that changed the device’s configuration.
Malfunction BOOL Decimal The device detected a serious error or failure that compromises device operation.
ChStatus SINT Binary Indicates various alarms on the analog signal. Also sets ChFault for Overrange, Underrange, and
CalFault.
HLimitAlarm BOOL Decimal Ch0.DeviceStatus.ChStatus:0 The analog output signal is being limited by the ChConfig.HighLimit
value. If ChConfig.LimitAlarmLatch is 1, alarm is retained until explicitly reset.
LLimitAlarm BOOL Decimal Ch0.DeviceStatus.ChStatus:1 The analog output signal is being limited by the ChConfig.LowLimit
value. If ChConfig.LimitAlarmLatch is 1, alarm is retained until explicitly reset.
RampAlarm BOOL Decimal ChStatus:2 Rate of change in Ch0.Data exceeds Ch0Config.MaxRampRate. Rate of change is
determined by the change in Ch0.Data divided by the RPI period. Thus if a step change in Ch0.Data
cannot be reached via the configured Ch0Config.MaxRampRate within one RPI, then
Ch0.DeviceStatusRampAlarm is set to 1. If Ch0Config.RampAlarmLatch is 1, then
Ch0.DeviceStatusRampAlarm remains set until explicitly reset by using CIP message even if the
condition returns to normal. The CIP message can be sent via MSG instruction in the Logix
controller or from the RSLogix 5000 Module Properties Limit dialog box.
InHold BOOL Decimal ChStatus:3 Channel holding its last output value, waiting for controller to match the value,
indicating that bumpless initialization of the control loop is complete.
CalFault BOOL Decimal ChStatus:4 Fault during calibration of channel 0.
NotANumber BOOL Decimal ChStatus:5
Ch0.Data is not a valid floating point number.
OpenWire BOOL Decimal ChStatus:7 Only valid in current mode (example 4…20 mA). 1 indicates no current is flowing,
probably due to open circuit.
ExtDeviceStatus SINT Binary Extended device status byte.
Maintenance
Required
BOOL Decimal Maintenance is needed.
DeviceVariableAlert BOOL Decimal Device variable alert.
Table 69 - Analog and HART by Channel (AB:1756-OF8H_AnalogHARTbyChannel:I:0)
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