Python ≥3.6 driver and command-line tool for Do More PLCs.

Installation

not made yet

Usage

Command Line

$ domoreplc the-plc-ip-address

This will print all the X, Y, DS, and DF registers to stdout as JSON. You can pipe this as needed. However, you'll likely want the python functionality below.

Python

This uses Python ≥3.5's async/await syntax to asynchronously communicate with a DoMorePLC. For example:

import asyncio
from domoreplc import DoMorePLC

async def get():
    async with DoMorePLC('the-plc-ip-address') as plc:
        print(await plc.get('df1-df500'))

asyncio.run(get())

The entire API is get and set, and takes a range of inputs:

>>> await plc.get('df1')
0.0
>>> await plc.get('df1-df20')
{'df1': 0.0, 'df2': 0.0, ..., 'df20': 0.0}
>>> await plc.get('y101-y316')
{'y101': False, 'y102': False, ..., 'y316': False}

>>> await plc.set('df1', 0.0)  # Sets DF1 to 0.0
>>> await plc.set('df1', [0.0, 0.0, 0.0])  # Sets DF1-DF3 to 0.0.
>>> await plc.set('y101', True)  # Sets Y101 to true

Currently, only X, Y, C, DS, and DF are supported:

x	bool	Input point
y	bool	Output point
c	bool	(C)ontrol relay
df	float	(D)ata register, (f)loating point
ds	int16	(D)ata register, (s)igned int

We personally haven't needed to use the other categories, but they are straightforward to add if needed.

Tags / Nicknames

Recent DoMorePLC software provides the ability to export a "tags file", which contains all variables with user-assigned nicknames. The tags file can be used with this driver to improve code readability. (Who really wants to think about modbus addresses and register/coil types?)

To export a tags file, open the DoMorePLC software, go to the Address Picker, select "Display MODBUS address", and export the file.

Once you have this file, simply pass the file path to the driver. You can now set variables by name and get all named variables by default.

async with DoMorePLC('the-plc-ip-address', 'path-to-tags.csv') as plc:
    await plc.set('my-nickname', True)  # Set variable by nickname
    print(await plc.get())  # Get all named variables in tags file

Additionally, the tags file can be used with the commandline tool to provide more informative output:

$ domoreplc the-plc-ip-address tags-filepath