- Coordinates the PLC-5 application and ControlNet communications from the controller position of a 1771 chassis
- Supports the processor family’s documented serial, Data Highway Plus, and Remote I/O communication paths
- Replacement requires both the saved controller project and the original ControlNet network context
1785-L20C places PLC-5 execution and ControlNet communication in the controller position of a 1771 chassis.
Its communication options also cover serial, Data Highway Plus, and remote-I/O functions documented for the processor family.
Successful maintenance depends on restoring both the controller application and the network context expected by the installed ControlNet equipment.
Availability, condition, price, and shipping time for 1785-L20C are confirmed during quotation.
Allen-Bradley 1785-L20C PLC-5/20C ControlNet Processor Manuals, Datasheets, Links
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
- The processor includes one onboard ControlNet communication channel.
- Earlier PLC-5/20C catalogs belong to the documented 1.0/1.25 ControlNet phase.
- Network node and schedule information must agree with the installed ControlNet system.
- The official processor table identifies 16K words of user memory.
- The processor occupies the leftmost slot of a supported 1771 chassis.
- Documented memory-module options include 1785-ME16 through 1785-M100.
- Save the PLC-5 project and channel configuration before removal.
- Record chassis keying, rack allocation, battery condition, and network settings.
- Commission the controller and ControlNet path together after replacement.
- PLC-5/20C control systems operating on documented ControlNet 1.25 networks
- 1771 architectures requiring a 16K-word processor with onboard ControlNet communication
- Control applications combining ControlNet with serial, DH+, or Remote I/O communication