Allen-Bradley 1746-NI4 Ser A SLC 500 PLC Analog Input Module

Allen-Bradley 1746-NI4 Ser A SLC 500 PLC Analog Input Module Description:

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The input module performs autocalibration when a channel is initially enabled. Autocalibration compensates for offset and gain drift of the A/D converter caused by temperature change within the module. An internal, high-precision, low drift voltage and system ground reference is used for this purpose. In addition, you can program the module to perform a calibration cycle once every 5 minutes. See Selecting Enable/Disable Cyclic Autocalibration (Word 6, Bit 0) on page 65 for information on configuring the module to perform periodic calibration.

Because it is a start-up guide for experienced users, this chapter does not contain detailed explanations about the procedures listed. It does, however, reference other chapters in this book where you can get more information about applying the procedures described in each step.

1. Check that the bus lever of the module to be installed is in the unlocked (fully right) position. 

2. Use the upper and lower tongue-and-groove slots (1) to secure the modules together (or to a controller). 

3. Move the module back along the tongue-and-groove slots until the bus connectors (2) line up with each other. 

4. Push the bus lever back slightly to clear the positioning tab (3). Use your fingers or a small screwdriver. 

5. To allow communication between the controller and module, move the bus lever fully to the left (4) until it clicks. Ensure it is locked firmly in place.