Please, I am encountering a timeout issue while trying to request data from a Mitsubishi PLC. I have checked every configuration setting on GX Works2 as to why Node-RED isn't able to request data from the Mitsubishi Q-Series PLC, but it isn't working.
The MC Read node shows "Ready", which probably means it is connecting to the PLC, but it then shows "Timeout" when I try to read a register. Something is likely blocking this request from Node-RED, and I don't want to make any changes that I’m not well-informed about.
Here is a screenshot of my Ethernet Operation Setting, Open setting and MC Read Node Configuration window in GX Works2. Any advice on what might be blocking the data request?
So far, there is no information regarding Node-RED, this makes it very difficult to help you.
Which version of Node-RED?
Which added NR Node and Revision/method are you using to ‘talk to’ PLC?
The NR flow?
Any Debug messages?
GX Works2 What is this and what part does it play in ‘the System’?
You have to realise that there may not be too many people familiar with the equipment and software you are using. However, there are some people who may be able to help if you help them understand your configuration.
Version : v4.1.2
Node; node-red-contrib-mcprotocol version 1.2.1
No debug messages. GX Works2 is Mitsubishi’s official programming and configuration software for the PLC. Attached to this post, is a screenshot of the NR flow.
Spot the mismatch:
As documented in the node, UDP is by far the preferred / stable method.
And knowing Mitsi Q series PLCs as I do, I recommend setting up extra spare ports like 5010, 5011, 5012 for the day the just stop working and you need to reset the PLC. With spare ports setup, you can simply adjust node-red to one of the spare ports.
