Host Engineering Forum

General Category => ECOMs and ECOM100s => Topic started by: plcprog1 on April 28, 2017, 09:38:58 AM

Title: reading a v-mem address from a H2-DM1E into a P3k.
Post by: plcprog1 on April 28, 2017, 09:38:58 AM

Trying to read a v-memory address ( V2) thru the domore on board Ethernet port with a P3K Modbus read instruction.
The P3K MRX seems to be working ok but not seeing the holding register. I think. With the domore I have a move instruction moving a CT0.Acc value into v2. The on the P3k side reading a holding reg. 40003. I thought possible it should be 40002 but also did not work. Do I need to setup some type of Modbus instruction in domore ( MH0 or MHR0) to make this work. Just trying to read a counter value from domore to P3K. Any suggestions would be helpful. Thanks

Title: Re: reading a v-mem address from a H2-DM1E into a P3k.
Post by: BobO on April 28, 2017, 10:24:17 AM

All Do-more Modbus servers target the Modbus guest memories MI, MC, MHR, MIR. If you are reading Modbus Holding Register 3, it will be MHR3 in Do-more.