Rockwell Automation 1756-OF8H ControlLogix HART Analog I/O Modules - Manual (Page 63)

Rockwell Automation Publication 1756-UM533C-EN-P - February 2011 63
1756-IF8H HART Analog Input Module Chapter 4
Figure 10 - Simplified 1756-IF8H Voltage Input Circuit
1756-IF8H Module Fault and
Status Reporting The 1756-IF8H module multicasts status/fault data to the controller with its
channel data. The fault data is arranged to let you choose the level of granularity
you desire for examining fault conditions. Three levels of tags work together to
provide an increasing degree of detail as to the specific cause of faults on the
module.
Table 6 lists tags you can examine in ladder logic to indicate when a fault has
occurred.
0.01 μF
Analog to
Digital
Converter
22 K Ω 10 M Ω
-15 V
+
-
0.01 μF
22 K Ω
10 M Ω
249 Ω
1/4 Watt
INO+
I RTN-O
INO-
+15 V
Differential
Voltage
Inputs V
+
-
RTN
RTN
RTN
RTN
Table 6 - Tags That Can Be Examined in Ladder Logic
Tag Description Tag Name
Analog and HART PV Tag Name
Analog and HART by Channel
(1)
Module Fault Word This word provides fault summary reporting. ModuleFaults ModuleFaults
Channel Fault Word This word provides underrange, overrange, and
communication fault reporting. ChannelFaults
ChxFault ChannelFaults
ChxFault
Channel Status Word These words provide individual channel underrange
and overrange fault indications and reporting for
process alarms, rate alarms, and calibration faults. ChxStatus Chx.DeviceStatus
Chx.DeviceStatus.AlarmStatus
HART Faults This provides HART communication status. HARTFaults, ChxHARTFault Chx.DeviceStatus.HARTFault
HART Device Status This provides HART field device health. HART.ChxDevice Status Chx.DeviceStatus.FieldDeviceStatus
(1) Available only for 1756-IF8H firmware revision 2.1.