We are using Node-Red 2.1.4, Node.js 16.12. Modbus is handled by node-red-contrib-modbus version 5.27.2
I am using flex-getter and setter and cascading the read requests to an EATON PLC. The only way to recover communication is to power cycle the PLC. I was told by EATON that the MODBUS requests need to explicitly close the MODBUS connecton after each request but I cannot find that option with the MODBUS TCP node.
Sounds like a cop out for their own device firmware deficiency to me
Odd. The version in the catalogue is
What frequency are you reading and writing?
Can reads be grouped to avoid unnecessary polling?
I installed the "latest" version of MODBUS TCP shown in the Github repo.
I have essentially grouped the polling reads for I/O to one flex-getter per inputs and one for outputs. Within that grouping I cascade by feeding the response from the flex-getter to trigger the next JSON payload, etc. There are about ten read requests on the Inputs and 19 for the outputs. I grouped requests as best I could by address sequences. I am trigger the polling at different intervals (2.8 seconds for inputs and 4.7 seconds) for outputs hoping to reduce the load.
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