Allen-Bradley 1756-L6 Series, Reference Manual, Page: 50 / 134

50 Rockwell Automation Publication 1756-RM001I-EN-P - May 2012
Chapter 5 ControlLogix I/O Modules
Specify the Same Controller as the Owner
The same controller must own both analog input modules.
You must use Analog Inputs Faulted as a safety status/permissive in respective
safety-related outputs.
Wiring ControlLogix Analog Input Modules
In general, good design practice dictates that each of the two transmitters must be
wired to input terminals on separate modules such that the channel values may be
validated by comparing the two within an acceptable range. Special consideration
must be given in applying this technique, depending on the type of module being
used.
Wiring the Single-Ended Input Module in Voltage Mode
Make sure you:
• review the considerations in Using Analog Input Modules on page 47 .
• use the correct documentation (listed in Additional Resources on page 10 )
to wire the module.
• tie all (-) leads of the transmitters together when operating in single-ended
Voltage mode.
Figure 22 shows how to wire the 1756-IF8 module for use in Voltage mode.
Figure 22 - ControlLogix Analog Input Module Wiring in Voltage Mode
Voltage
Transmitter A
Ch0 +
43368
Ch0 +
Ch0 – Ch0 –
(+)
(–)
Voltage
Transmitter B
(+)
(–)