Rockwell Automation AADvance Controller Solutions Handbook - Manual (Page 106)

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7-12 Document: 553631
(ICSTT-RM447J_EN_P) Issue: 09:
Solutions Handbook (AADvance Controller)
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 measures
input voltages in the range 0V to 32V dc. Each channel provides
both digital state and voltage data to the processor module for
field device state, line monitoring and field fault detection.
Input modules provide module and individual channel status
indications through the front panel LEDs. These status
indications are also 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.
Signal and power isolation circuits 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.
These modules mate with the T9801/2/3 Digital input
termination assemblies. When digital input modules are installed
in a dual or TMR configuration they provide fault tolerant input
functionality. Hence, plant maintenance personnel can replace
input module without interrupting the input signal flow to the
processor modules.