Rockwell Automation AADvance Controller Demo Unit - Manual (Page 16)

Demo Unit User Manual (AADvance Controller)
1-10 Document: 553850 Issue 1.2: March 2011
T9401/2 Digital Input Module, 24V dc, 8/16 channel
The T9401/2 digital input module monitors eight (T9401) or
sixteen (T9402) isolated digital input channels and notifies the
processor module of each field device state and channel
condition. Each channel provides both digital state and analogue
voltage data to the processor module for field device state, 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 generate clear fault 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 a digital input module in a dual or TMR
configuration, plant maintenance personnel can fit a new input
module without interrupting the input signals.
Digital Input Line Monitoring
Each digital input module parameters is set up through the AADvance Workbench
configuration tools. Switching levels for each digital input channel are configurable at
the module and the channel level. Each input has five configurable voltage bands (there
are eight distinct switching thresholds to allow hysteresis), each of which can be
adjusted through the AADvance Workbench to provide line monitoring, field loop
monitoring and additional field device diagnostics.