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st-one-io / node-red-contrib-cip-ethernet-ip

A Node-RED node to interact with Allen Bradley / Rockwell PLCs
GNU General Public License v3.0
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eth-ip in not working as expected #7

Open riplatt opened 5 years ago

riplatt commented 5 years ago

Hi, I have found if you are writing a PLC variable via 'eth-ip out' and reading the same variable via a 'eth-ip in'. The 'eth-ip in' fails to update.

image

Node-Red reproduce: [{"id":"ddbb44b9.534618","type":"eth-ip in","z":"190d888b.33b4c7","endpoint":"dd5e958.3302d68","mode":"single","variable":"Output","program":"","name":"","x":130,"y":80,"wires":[["32fe7531.aa29ea"]]},{"id":"df38996d.81d568","type":"eth-ip in","z":"190d888b.33b4c7","endpoint":"dd5e958.3302d68","mode":"single","variable":"Toggle","program":"","name":"","x":130,"y":140,"wires":[["31a8986b.ca8ca8"]]},{"id":"c0dc92b8.c7082","type":"eth-ip out","z":"190d888b.33b4c7","endpoint":"dd5e958.3302d68","variable":"Toggle","program":"","name":"","x":330,"y":200,"wires":[]},{"id":"32fe7531.aa29ea","type":"debug","z":"190d888b.33b4c7","name":"Debug Output","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","x":360,"y":80,"wires":[]},{"id":"31a8986b.ca8ca8","type":"debug","z":"190d888b.33b4c7","name":"Debug Toggle","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","x":360,"y":140,"wires":[]},{"id":"ec282ead.135fb","type":"inject","z":"190d888b.33b4c7","name":"","topic":"","payload":"true","payloadType":"bool","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":130,"y":200,"wires":[["c0dc92b8.c7082"]]},{"id":"3d3b7aa0.2d2456","type":"inject","z":"190d888b.33b4c7","name":"","topic":"","payload":"false","payloadType":"bool","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":130,"y":240,"wires":[["c0dc92b8.c7082"]]},{"id":"dd5e958.3302d68","type":"eth-ip endpoint","z":"","address":"192.168.1.10","slot":"10","cycletime":"500","name":"Test","vartable":{"":{"Output":{"type":"BOOL"},"Toggle":{"type":"BOOL"}}}}]

Allen-Bradley test code: XIC(Toggle)OTE(Output);

Node-Red Version: 0.20.0 node-red-contrib-cip-ethernet-ip Version: 1.0.1

Let us know if you need any more info or logs.

Thanks.

youngkzy commented 5 years ago

I am working with the PCCC node for Micrologix and SLC controllers. Now I'm testing the "Ethernet/IP" node as we have some CompactLogix controllers. It seems to update the processor fine, but the read node does not work. I am using a 1769-L24ER-QBFC1B controller. How do I set up the node to read the tag value. The Node-RED Code is simple as it reads the value, increments it and then writes it to the same tag. I can force the tag to increment, but the input does not change state unless I restart the flow.

riplatt commented 5 years ago

@youngkzy I found that the eth-ip in node will fail to update when written to from node-red but if you change the value in the controller (not through node-red) then the eth-ip in node will update.

As a work around for a systems where we need to read and write inputs, we make a shadow map of the inputs to read from Node-Red.

i.e.:

XIC(Input01)OTE(shadow_Input01)

Here you would write your values to input01 with eth-ip out and read shadow_Input01 with eth-ip in

Hope that helps until a real solution can be found.

youngkzy commented 5 years ago

Thank you for your quick reply. I was connected to the PLC via Logix5000 software. I updated the tag with another value. The Node-RED input changed state!... Each time I modified the value by means of the programming software it worked. N70 was the first tag. I set up another tag. N71. Program change in Node-RED to read N71, increment and write to N70... The PLC program just copies N70 to N71. Now it works. But you still cannot monitor what you wrote to unless you monitor an alias. Thats just not handy...