Rockwell Automation AADvance Controller Demo Unit - Manual (Page 20)

Demo Unit User Manual (AADvance Controller)
1-14 Document: 553850 Issue 1.2: March 2011
T9431/2 Analogue Input Module, 8/16 Channel
The T9431/2 analogue input module monitors eight (T9431) or
sixteen (T9432) isolated analogue input channels and notifies the
processor module of the field device value and channel
condition. Each channel provides digital state and analogue
process value data to the processor for process monitoring, line
monitoring and field fault detection.
The input module provides 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 both system and
module levels provide clear indications which help rapid
maintenance and repair.
The module incorporates signal and power isolation circuits,
which separate each input channel from the rest of the system,
protecting the controller from field faults. An independent
watchdog arrangement monitors the module operation and
provides additional fault containment by a shutdown mechanism
should a fault occur.
When a controller uses an analogue input module in a dual or
TMR configuration, plant operations personnel can fit a new
input module without interrupting the input signals.
Analogue Input Line Monitoring
Each analogue input module is set up through the AADvance Workbench. Monitoring
levels for each analogue input channel are configurable at the module and the channel
level. The default parameters are
 Fault: 0 to 3.8mA
 Normal: 3.8 to 22.0mA
 Fault: > 22.0mA
Each input has five configurable voltage bands (there are eight distinct switching
thresholds to allow hysteresis), each of which can be adjusted to provide line
monitoring and field device diagnostics.