plc-python

kkhabeeb · Jun 10, 2019

hello friends,am new to this group, currently am working in automation company,so i have to communicate my python with my unitronics PLC v350 to fetch and write process variable, any one can give me a simple program or introduction

kallileo · Jun 10, 2019

Does it have RS485 or Ethernet ports?
You could AdvancedHMI (google it) and use it to communicate with your PLC.
It supports VB.Net and C#.
For Python you need a Modbus library and I believe you can easily find one if look it up.

For example:

https://sourceforge.net/projects/easymodbustcp-udp-rtu-python/

kkhabeeb · Jun 11, 2019

yes, friend, ihave a rs485 port

kallileo · Jun 11, 2019

Connect the PC to plc using a USB to rs485 converter. Then setup modbus rtu slave on your plc and use your Python code to read and write data.

kkhabeeb · Jun 11, 2019

yes , i have done the communication with moxa (usb-rs485) ,can you get me a basic python script to communicate with the plc

kwade · Jun 12, 2019

It seems like a lot of good example code already exists. It is generic, but maybe you can mod it to suit your needs.

Look here
https://pymodbus.readthedocs.io/en/v1.3.2/examples/synchronous-client.html

I don't know python, but from a quick read, it seems to support reading/writing coils/registers using pymodbus TCP, UDP, ASCII and RTU,

plc-python

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