Allen-Bradley MicroLogix 1000 PLC Guide

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1120 PLC Field Replacement Instructions

Description:

This kit is used to replace the Allen Bradley MicroLogix 1000 PLC in the 1120 with the Allen

Bradley Micro850 PLC. Serial numbers before 1120-20 were shipped from Norfield with the Allen

Bradley MicroLogix 1000 PLC which was discontinued in June 2017. The Allen Bradley Micro850 PLC uses

the same wiring for the Inputs and Outputs as the MicroLogix 1000 PLC. The Allen Bradley Micro850 PLC

should be Pre-programmed from Norfield.

Contents of Kit:

•1x 11-2043 Allen Bradley Micro850 48 Point PLC

•1x 11-2095 Allen Bradley 24VDC Power Supply

•1x 1120-402 Wiring Diagram

•1x 9” DIN Rail Section

•1x 72” Red 16GA wire

•1x 60” Blue 16GA wire

•1x 24” Red 14GA wire

•1x 24” White 14GA wire

•1x 24” Green 14GA wire

•5x Crimp Wire Butt Connector (Red)

•1x 5A fuse

Instructions:

1. Label Wires connected to PLC and disconnect them from the screw terminals

2. Move 4CON down with the rest of the Contactors

•Replace DIN Rail with a 9” section provided in kit

•Replace wire that is connected to Terminal 2 on 4CON with 24” Red 16GA wire provided

in kit

•Replace wire that is connected to Terminal 13 on 4CON with 24” Blue 16GA wire

provided in kit

•Shorten wire that is connected to Terminal 1 on 4CON

•Shorten wire that is connected to Terminal A1 on 4CON

•Shorten wire that is connected to Terminal A2 on 4CON

3. Move 120VAC Power Wires from ML1000 PLC to 24VDC Power Supply

•Extend L1 wire with 10” Red 14GA wire and butt connector provided in kit

•Extend L2 wire with 10” White 14GA wire and butt connector provided in kit

•Extend GND Wire with 10” Green 14GA wire and butt connector provided in kit

4. Extend 24VDC+ and 24VDC- wires

•2x 10” Blue 16GA Wire and butt connector provided in kit

5. Add Output power jumpers to Micro850 PLC

•6x 6” Red 16GA Wire provided in kit

6. Move Upper Horizontal Wire Way Up for Clearance

•Remove Wire Way from Back Panel

•Mark new holes ¼” above the old holes

•Drill and Tap holes for 8-32 screws used to hold the Wire Way

•Attach Wire Way to Back Panel

7. Re-Connect wires that were removed from ML1000 PLC to Micro850 PLC

•Micro850 PLC has removable Screw Terminals for Inputs and Outputs. This feature

makes it easier to remove them from the PLC while reconnecting all of the inputs and

outputs.

8. Replace 250mA fuse (7FU) with 5A fuse provided in kit