Pyunitelway

Pyunitelway is a Python library to use the UNI-TELWAY protocol to talk to Schneider PLCs (Programmable Logic Controller).

This library allows to:

• Read a bit in %S and %M
• Read a word in %SW, %KW and %MW
• Read a double word in %KD and %MD
• Read multiple bits in %S and %M
• Read multiple words in %SW, %KW, and %MW
• Read multiple double words in %KD and %MD
• Write a bit in %S and %M
• Write a word in %SW and %MW
• Write a double word in %MD
• Write multiple words in %SW and %MW
• Write multiple double words in %MD
• Read and write I/O channels (couldn't test)

Installation

Clone the repository, then install using setup.py:

python3 setup.py install --user # to install for the user only

How to use ?

This library is designed to use a TCP-RS485 adapter. The adapter is connected to the PC or server which uses this lib via Ethernet or Wi-fi or anything else, and is connected to the PLC via RS-485 on the TER plug.

This library was developed using the USR-TCP232-306 adapter. It was not tested with another kind of connection.

Test setup