Rockwell Automation Publication ICSTT-RM447M-EN-P - July 2019 121
Module Overview and Specifications Chapter 7
T9401/2 Digital Input
Module, 24 Vdc, 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 0 V to 32 Vdc. Each channel supplies the digital state and voltage data to
the processor module for field device state, line monitoring and field fault
detection.
Input modules give 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 give clear fault indications which
help fast maintenance and repair.
Signal and power isolation circuits 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 gives
more 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, enabling you to
replace a faulty input module without interrupting the channel data flow to the
processor modules.
T9401/2 Digital Input Module Specification
Table 27 - T9401/2 Digital Input Module Specification
Attribute Value
Functional Characteristics
Input Channels T9401: 8
T9402: 16
Performance Characteristics
Safety integrity level IEC 61508 SIL 3
1
Safety level degradation 1oo1D, 1oo2D,2oo3D
Safety accuracy limit 1.0 Vdc
Self test interval < 1 hour; system dependent
Sample update interval (no filter) 6 ms
Sequence of events
Event resolution
Time-stamp accuracy
1 ms
10 ms
Electrical Characteristics
Module Supply Voltage:
Voltage Redundant + 24 Vdc nominal; 18 Vdc to 32 Vdc range
Module supply power dissipation T9401: 3.3 W (11.3 BTU/hr.)
T9402: 4.0 W (13.6 BTU/hr.)
Input data voltage range 0V to 32 Vdc
Maximum Slew Rate See Figure 30 below
2
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