The Allen-Bradley 1785-L20C PLC-5 is a ControlNet programmable controller and processor. This unit ships with a comprehensive installation kit containing a 1770-XYC lithium battery, battery cover with screw, two keys, four 150-Ohm and two 82-Ohm terminating resistors, DIN rail connector cover, two 3-pin connectors, and a 1784-CP7 cable adapter.
Installation Safety: Always use an approved ground point during installation and avoid touching connector pins or the backplane connector. When not in use, store the processor in its static-shielded container to prevent electric shock and hardware damage.
Front Panel Features
The 1785-L20C front panel includes comprehensive status indicators and controls:
- Red battery indicator light
- Red/green RUN/FAULT indicator
- Amber force indicator
- Red/green indicators for ControlNet I/O, Channel 2, and ACTIVE/FAULT Channel 0 Communication
- Memory module expansion space
- Dedicated battery compartment
- Multiple channel ports
- Key switch for selecting processor operating mode
Connectivity & Specifications
The 1785-L20C features a serial port, coprocessor port, and control coprocessor expansion port. This controller supports up to 512 of any I/O and 512 analog I/O, with capacity for up to 16 MCPs.
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Compatible Allen Bradley Parts
1775-LX
1784-PCIS
1361-NO61-2-5
1775-MEA
1203-CN1
1394C-AM04
1775-MED
1203-GD1
1394C-AM07
1775-S4A
1203-GU6
320087-A06
1775-S4B
1305-BA01A-HA2
15-131623-00
1775-S5
1305-BA03A
1746-HT
1775-SR
1305-BA09A-HA2
1746-IH16
1784-KTCX15
1336-BDB-SP30D
1746-IO12