Rockwell Automation T3432-CA ICS Regent RTD Input Equipment - Manual (Page 9)

RTD Input Equipment (T3432)
P D - 6 0 3 7 M a r - 0 6
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Figure 5. Simplex RTD Input Configuration.
Fault Tolerant Configurations
For safety-critical inputs, redundant input modules and
multiplexers are used in a 2oo3 or 1oo2 fault tolerant
configuration. In these configurations the redundant RTD
input equipment is connected to single or multiple RTDs.
When single RTDs are installed in the field, the RTDs connect
to one termination panel containing redundant multiplexers
which interface to redundant input modules as illustrated in
Figure 6. When redundant RTDs that sense the same process
variable are installed in the field, each RTD connects to one
termination panel, multiplexer and input module as
illustrated in Figure 7. Each RTD input module, cable, and
multiplexer is hot replaceable. In redundant input
configurations, if a fault occurs in one set of equipment, the
failed equipment can be removed and replaced while the
system continues to sense the inputs from the remaining two
sets of equipment.