Posted 19 May 2022 Hello everyone, I have a problem, i want to read inverter holding register using modbus tcp. I am using QJ71MT91 and ABB580 FENA-21. QJ71MT91 successfully opened and no error was detected. I want to read the address to 101 and so on. in automatic communication parameter >> I have tried changing the target MODBUS Device Head from 0 to 102, and I got error code 7360. do I also have to use the auto refresh setting? I ask for guidance PLC Q03UDECPU : 192.168.3.181 PLC QJ71MT91 : 192.168.3.121 INVERTER : 192.168.3.11 i use gx works2 best regard chelz96 Share this post Link to post Share on other sites
Posted 19 May 2022 The Modbus device assignment parameters you do not need to change this is for when you're a slave station. You should change the head adres to 101 if that is the adres you need, But since you get an exception error when you do possibly on the next 20 addresses don't exist. (101-121) Try reading just one device first by changing the accees points to 1. When this works you will need to use the auto refresh to refresh(copy) bfm 1000h ------ (where youre information is stored) to the PLC Devices you want to use 2 people like this Share this post Link to post Share on other sites
Posted 19 May 2022 (edited) I see, so the problem is maybe the next address doesn't exist, I'll try your suggestion for the memory address of the head buffer, do I need to change it from 1000h to 0000h? Is there a possibility if the address we received doesn't match the address in question? Thanks for your advice and sorry for the late reply @Gambit Edited 19 May 2022 by Chelz96 Share this post Link to post Share on other sites
Posted 20 May 2022 9 hours ago, Chelz96 said: for the memory address of the head buffer, do I need to change it from 1000h to 0000h? Is there a possibility if the address we received doesn't match the address in question? No don't change that it should remain 1000. When you read 7 registers and you do another read than you change it to 1007 or higher. You might have an offset of 1 in the address depending if they start at 0 or 1. 1 person likes this Share this post Link to post Share on other sites
Posted 24 May 2022 Sir @Gambit, Thanks for your advice and I'm sorry for the late reply it has worked according to the address. head buffer memory remains 1000 because as you said, if i change it, it will offset the address if i want to start at 0 Share this post Link to post Share on other sites
Posted 24 May 2022 It's just the first adress that stores the value of the modbus Dev you are reading. So this is what you will autorefresh to Mitsubishi Devices like D0 Share this post Link to post Share on other sites