Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 56)

56 Publication 1756-UM0009C-EN-P - December 2010
Chapter 4 Non-isolated Analog Voltage/Current Input Modules (1756-IF16, 1756-IF8)
Choose a Wiring Method The 1756-IF16 and 1756-IF8 modules support these wiring methods:
• Single-ended Wiring Method
• Differential Wiring Method
• High-speed Mode Differential Wiring Method
After determining the wiring method you will use on your module, you must
inform the system of that choice when you choose a
Communication Format .
For more information, page 205
For examples of each wiring format on the 1756-IF16 module, see the
examples beginning on
page 70 . For examples of each wiring format on the
1756-IF8 module, see the examples beginning on page 74 .
Single-ended Wiring Method
Single-ended wiring compares one side of the signal input to signal ground.
This difference is used by the module in generating digital data for the
controller.
When using the single-ended wiring method, all input devices are tied to a
common ground. In addition to the common ground, the use of single-ended
wiring maximizes the number of usable channels on the module
(eight channels for the 1756-IF8 module and 16 channels for the 1756-IF16).