Rockwell Automation Publication ICSTT-RM447M-EN-P - July 2019 125
Module Overview and Specifications Chapter 7
T9431/2 Analogue Input
Module, 8/16 Channel
The T9431/2 analogue input has eight (T9431) or sixteen (T9432) isolated
analogue input channels and measures input current in the range 0 mA to 24
mA. Each channel supplies digital state and analogue data to the processor for
process monitoring. Each input has five configurable voltage bands (there are
eight distinct switching thresholds to allow hysteresis), each of which can be
adjusted to supply line monitoring and field device diagnostics.
The input module makes local module and channel status indications through
its front panel LEDs, the same indications can be connected to application
variables and viewed at the Workbench. Comprehensive diagnostics at system
and module levels give clear indications which help fast maintenance and
repair.
The module incorporates signal and power isolation circuits, which divide each
input channel from the remainder of the system, protecting the controller from
field faults. An independent watchdog arrangement monitors the module
operation and supplies more fault containment by a shutdown mechanism if a
fault occurs.
These modules mate with the T9831/2/3 Analogue Input termination
assemblies. When analogue modules are installed in a dual or TMR
configuration they supply fault tolerant input functionality, enabling you to
replace input modules without interrupting the channel input data flow to the
processor modules.
This module supports HART commands #03 to collect data from the field
device. The application can be configured to use HART information to
monitor and respond to device conditions, it may also be used to supply
module diagnostic information such as comparison and error reporting.
Analogue Input Line Monitoring
Each analogue input module is set up through the AADvance Workbench.
Monitoring levels for each input channel are configurable at both the module
and channel level. The default parameters are:
• Fault: 0 mA to 3.8 mA
• Normal: 3.8 mA to 22.0 mA
• Fault: > 22.0 mA
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