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ROC827 Instruction Manual
Issued Mar-06 Input/Output Modules 4-16
Note: All I/O modules are isolated on the field side. Be aware that you can
induce ground loops by tying commons from various modules together.
Figure 4-14. RTD Sensor Wiring Terminal Connections
Figure 4-14 and Table 4-2 display the connections at the RTD terminals
for the various RTD probes.
Table 4-2. RTD Wiring
Terminal 4-Wire RTD 3-Wire RTD 2-Wire RTD
REF Red Jumper to + Jumper to +
+ Red Red, Jumper to REF Red, Jumper to REF
– White White White, Jumper to RET
RET White White Jumper to –
Note: The wire colors for the RTD being used may differ.
4.10 J and K Type Thermocouple Input Modules
The five-channel J and K Type Thermocouple Input module monitors
either J or K Type Thermocouple (T/C). J and K refer to the type of
material used to make a bimetallic junction: Type J (Iron/Constantan) and
Type K (Chromel/Alumel). These dissimilar junctions in the thermocouple
junction generate different millivolt levels as a function of the heat to
which they are exposed.
The J and K Type Thermocouple Input module measures the voltage of
the thermocouple to which it is connected. The T/C voltage is measured
and a Cold Junction Compensation (CJC) correction factor is applied to
compensate for errors due to any voltage inducted at the wiring terminals
Jumper
4-Wire RTD
3-Wire RTD
2-Wire RTD
Red
Red
Red
Jum
p
er
Red
Jum
p
er