Siemens S7-1200 PLC client connection to SUN2000-KTLxxx via ModbusTCP
Created: Aug 11, 2021 08:05:56Latest reply: Aug 12, 2021 10:15:11
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BetterMing
Reply mahak Created Aug 11, 2021 09:10:22
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Sorry, the inverter does not support Modbus-TCP protocol
BetterMing
Reply BetterMing Created Aug 11, 2021 09:11:23
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But Smartlogger devices support Modbus-TCP protocol
mahak
Reply BetterMing Created Aug 11, 2021 09:12:51
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Sorry to say, but YES inverter is supporting |
All Answers
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BetterMing
Reply mahak Created Aug 11, 2021 09:10:22
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Sorry, the inverter does not support Modbus-TCP protocol
BetterMing
Reply BetterMing Created Aug 11, 2021 09:11:23
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But Smartlogger devices support Modbus-TCP protocol
mahak
Reply BetterMing Created Aug 11, 2021 09:12:51
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Sorry to say, but YES inverter is supporting |
BetterMing
Created Aug 12, 2021 07:36:52
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When you set the answer as best, the question is automatically set as solved.
mahak
Reply BetterMing Created Aug 12, 2021 10:39:24
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Can I take it back, cancel or change the best answer |
mahak
Created Aug 12, 2021 06:37:26
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Hi I just have thought this thing, function code 103, because it seems that Huawei ModbusTCP communication is not according normal function codes. Review of Modbus Function Codes Function Code Register Type 1 Read Coil 2 Read Discrete Input 3 Read Holding Registers 4 Read Input Registers Huawei wants to use F03 to read input area 30001-39999 and F04 is meant for 40001-49999
mahak
Reply mahak Created Aug 12, 2021 06:48:58
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Maybe this MB_Mode 103 was created because of this kind of a problems, no limits for the register number.... I noticed this "MB_Mode 103" from some youtube video. I would have tested it but unfortunately my Siemens MB_Client is more according Modbus standard and do not have this, I only have MB_Mode 0 in TIA versio 14. |
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TIA V14 is pretty old. I'm on V17. May be you can select a newer version of the MB_Client:
I don't know, when Mode 103 was implemented. |
mahak
Created Aug 12, 2021 07:39:52
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Yes, I checked and I can select V4.1 from TIA14. Also there is mode 103, so far so good... Then comes this 'BUT': S7-1200 plc has firmware 4.2 and not yet sure is it supporting this V4.1 Modbus. Right now tells me 'not supported' when switched to new Modbus version...not sure yet is it just TIA which is confused about this sudden 'surprise surprice'... continue checking.
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Finally working...reading daily kWh to Siemens 1200 FWv4.2 via ModbusTCP from registers 32114-32115, method was to going arround strange function of ModbusTCP in Huawei Had to change also following 'open user communication' to the latest to achieve functional Mode103:
Already over 6000 readings, so couple of in one second... |
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