A Node-RED node to interact with some Allen-Bradley PLCs using PCCC protocol
A Node-RED node to interact with some Allen-Bradley PLCs using PCCC protocol. Based on the awesome work of plcpeople/nodepccc.
You can install this node directly from the "Manage Palette" menu in the Node-RED interface. There are no external dependencies or compilation steps.
Alternatively, run the following command in your Node-RED user directory - typically
~/.node-red on Linux or
%HOMEPATH%\.nodered on Windows
npm install node-red-contrib-pccc
Just drop a
pccc in node to read and watch addresses of the PLC, or a
pccc out node to write values to the PLC. Both of them need a
pccc endpoint, where you can configure the address of the PLC (IP Address, port, and routing), the cycle time and timeout values, and the list of addresses available on the PLC.
The addresses follow the same syntax of what would be used on RSLogix, so for example
B3:0/0 addresses the bit 0 of byte 0 in the file B3, and
F8:1 points to the float 1 at the file F8.
The configuration of routing follows a very special syntax for now
0x01,0x00,0x01,0x00 | | | | | | | +-- 0: The slot of the PLC | | +------- 1: Route over the backplane | +------------ Reserved, always zero +----------------- 1: Number of words (1 = 2 bytes) of the routing section
You most likely just want to change the last number to the slot of the PLC when connecting to ControlLogix/CompactLogix controllers
- Validate addresses
- Improve routing configuration
Bugs and enhancements
Copyright: (c) 2016-2021, ST-One Ltda.