188 Rockwell Automation Publication 1769-UM021I-EN-P - May 2018
Chapter 8 Use I/O Modules with CompactLogix 5370 L2 Controllers
Figure 29 shows an example of ungrounded and grounded thermocouple
wiring diagrams on a 1769-L27ERM-QBFC1B controller.
Figure 29 - 1769-L27ERM-QBFC1B Controller Thermocouple Wiring Diagrams
Figure 30 shows an example of devices with differential connections wired to
the embedded analog inputs on a 1769-L27ERM-QBFC1B controller when it
is operating with voltage or current input types.
Figure 30 - 1769-L27ERM-QBFC1B Controller Differential Connections Diagrams
Earth Ground
Ungrounded Thermocouple Grounded Thermocouple
Earth Ground
IMPORTANT: You must order Cold Junction Connectors, catalog number
1769-CJC, separately from the CompactLogix 5370 L2 controllers.
Differential
Voltage
Tran smitte r
Earth Ground
Ground the shield
locally at the
module.
Differential
Current
Tran smitte r
Voltage Input Type
Differential Voltage
Connections
Current Input Type
Differential Current
Connections
IMPORTANT: For both
input types, we
recommend that you
use Belden #8761or
equivalent cable.
Earth Ground
Ground the shield
locally at the
module.
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