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TM172 DCLWT Communication with TM 172 PLC
HVAC and Pumping Forum
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Hello everyone.
I am able to connect a TM172 PLC with a TM172 DCLWT and send set points to the PLC from the display but the write coils modbus function which I want to use to write data to the coil registers in the display is not working. The PLC is the master.
Attached is a photo of the write coils function for more information. Somebody please help.
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Hi,
Coils are not supported on TM17x devices. Everything works normally via Holding Register. If you creat a Modbus Var as Bool (Status or EEPROM), this value is based on a 16Bit Holding Register. The information is in Bit 0 of the dedicated word.
And as tip I would suggest it will be easier if the HMI is the master and the PLC the slave. You could import the PARX file from the PLC Project (automatically created) into the Project file of TM172DCL. Then you could use directly all values of the PLC project in the dipslay tab of the HMI. If you want to use values in the Programming tab of TM172DCL then you have still to read them manually.
Link copied. Please paste this link to share this article on your social media post.
Hi,
Coils are not supported on TM17x devices. Everything works normally via Holding Register. If you creat a Modbus Var as Bool (Status or EEPROM), this value is based on a 16Bit Holding Register. The information is in Bit 0 of the dedicated word.
And as tip I would suggest it will be easier if the HMI is the master and the PLC the slave. You could import the PARX file from the PLC Project (automatically created) into the Project file of TM172DCL. Then you could use directly all values of the PLC project in the dipslay tab of the HMI. If you want to use values in the Programming tab of TM172DCL then you have still to read them manually.
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