Rockwell Automation 1756-OF8H ControlLogix HART Analog I/O Modules - Manual (Page 182)

182 Rockwell Automation Publication 1756-UM533C-EN-P - February 2011
Appendix A Tag Definitions
Analog Only
This table describes the input tags available in the Analog Only data format.
Ch5Config AB:1756_OF8H_ChConfig_Struct:C:0
Ch6Config AB:1756_OF8H_ChConfig_Struct:C:0
Ch7Config AB:1756_OF8H_ChConfig_Struct:C:0
PassthroughHandleTime
out INT Decimal Seconds to keep a reply to a HART pass-through service request before discarding.
15 seconds recommended.
PassthroughFreq_14 BOOL Decimal Selects the policy for sending HART pass-through messages. See Pass-through Setting, Ratio, and
Priority on page 101
PassthroughFreq_15 BOOL Decimal
Table 66 - Configuration (AB:1756_OF8H:C:0)
Member Name Type Style Description
Table 67 - Analog Only (AB:1756_OF8H_Analog:I:0)
Member Name Type Style Description
ChannelFaults
(bits 9…15 unused) INT Binary
ChxFault BOOL Decimal ChannelFaults.x, Indicates communication fault or fault condition from ChXStatus.
LoopOutputFault BOOL Decimal ChannelFaults.8, This is a hardware fault where the module has detected that the power supply to the
isolated (analog) side of the board has failed (no power). It does not roll into any other bits. The
OK status indicator is set to solid red.
HARTFaults SINT Binary
ChxHARTFault BOOL Decimal HARTFault.x
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.
ModuleFaults SINT Binary
CalFault BOOL Decimal ModuleFaults.1, 1756-IF8H module calibration failed.
Calibrating BOOL Decimal ModuleStatus.2, Calibration in progress.
AnalogGroupFault BOOL Decimal ModuleFaults.7, Indicates a fault has occurred on any channel (any of ChannelFaults).
Ch0Status SINT Binary Indicates various alarms on the analog signal. Also sets Ch0Fault for Overrange, Underrange,
and CalFault.
Ch0HLimitAlarm BOOL Decimal Ch0Status:0 The analog output signal is being limited by the Ch0Config.HighLimit value.If
Ch0Config.LimitAlarmLatch is 1, alarm is retained until explicitly reset.
Ch0LLimitAlarm BOOL Decimal Ch0Status:1 The analog output signal is being limited by the Ch0Config.LowLimit value.If
Ch0Config.LimitAlarmLatch is 1, alarm is retained until explicitly reset.
Ch0RampAlarm BOOL Decimal Ch0Status:2 Rate of change in Ch0Data exceeds Ch0Config.MaxRampRate. Rate of change is
determined by the change in Ch0Data divided by the RPI period. Thus if a step change in Ch0 cannot
be reached via the configured MaxRampRate within one RPI, then Ch0RampAlarm is set to 1. If
Ch0Config.RampAlarmLatch is 1, then Ch0RampAlarm remains set until explicitly reset 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 the RSLogix 5000 Module Properties Limit dialog box.
Ch0InHold BOOL Decimal Ch0Status:3 Channel holding its last output value, waiting for controller to match the value, indicating
that bumpless initialization of the control loop is complete.
Ch0CalFault BOOL Decimal Ch0Status:4 Fault during calibration of channel 0.