stackpointer Posted August 11, 2013 Report Share Posted August 11, 2013 Dear all, I am dealing with a project to control a VFD altivar 312 with a V130-33-T2. It is my first time with a PLC, have choosed unitronics, because I think that it is a great piece of equipment with a good cost. My problem is that I do not understand how to read a register from the VFD; I want to read ETA status word (W3201), it is a 16 bit register. Every bit gives the most important information on the current status of the VFD. Then I will use these bits to perform a check, give information on the display, and make decisions. Reading the projects examples, I understand how to configure the V130 as a Master. Understand how to enable the port com and how to enable the modbus. But do not understand how do I have to read the register. I have done the following: Slave ID 3 Slave start of vector 3201 Read: vector lenght 1 Master: Start of vector MB100 Status messages MI0 Total sessions DW0 Acknowledgements DW1 And this is what I do not understand, the 16 bits will be stored in MB100 as an integer decimal number, or every bit will be stored in MB100, MB101,...,MB115? Thanks a lot for your answers, the learning curve is hard in the beginnings. Regards, Quote Link to comment Share on other sites More sharing options...
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