HVAC and Pumping Forum
Support Forum for HVAC and pumping machines, Modicon M17x and EcoStruxure Machine Expert HVAC software for chillers, AHU, CRAC units for datacenters or process chillers applications - from design, implementation to troubleshooting and more, by Schneider Electric.
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Posted: 2024-04-26 01:02 AM
Hi,
I am using a TM221CE24R PLC to read, through Modbus RTU, some energy parameters from PM5100 power meter. My question is how could I convert the values of 4 registers into the value displayed on power meter?
I have tried to do it in PLC, but EcoStruxure Machine Expert-Basic doesn't the possibility of concatenating and converting the four registers into a float value. On this post, @kasmic_mike offered an excel of converting two registers into a float value. Is there an equivalent for reading and converting 4 registers?
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Posted: 2024-04-27 11:34 AM
PM5xxx register 3204 - Active Energy Delivered (Into Load) is INT64 of Wh. It's not a float.
PM5xxx register 2700 - Active Energy Delivered (Into Load) is FLOAT32 of kWh.
Read 2 registers from PM5xxx Modbus address 2699.
Result need to swapped to %MFxxx variable.
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Posted: 2024-04-28 11:13 PM
And to merge the readed values into a float should be explained in this video from LeTomas
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