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  1. In my project on the V120-22 I use 2 COM ports for RS485 Modbus communication. Port 2 - Master mode to communicate with another device, the Port 1 - Slave mode for communication with the upper level. After some time, the PLC stops responding via Port 1, while Port 2 is operating normally and ladder is operating normally too. Helps only restart the PLC. If Port 2 is disabled, then the connection through Port 1 is without failing. It seems, as if at the time of simultaneous access to the ports, there is a conflict. Why lost communication with Port 1? Ports settings: Port 2: 115200, 8, n
  2. Hi Has any one tried to connect a V1210 via modbus to a procon electronics PMDAIO I/O module. I have wired comms working ok but cant find the correct register locations in the PMDAIO. Any ideas ? Cheers Chris
  3. I have an application where I need to have one V130 PLC communicate to three V120 PLCs and read a bunch of MI registers. I have the V120 systems already supporting Modbus comms over RS485. So, I setup the V130 to be a Modbus Master and talk to all three Modbus slaves. I setup the Com port for RS485 with the appropriate properties. Then I have a RHR command to read from the first PLC. And this works just fine. I can read the Modbus registers from PLC1. Then I have two more nets with an RHR command to read from PLC 2 and PLC 3, but these nets don't seem to execute at all. What am I doing wrong
  4. Hi, Can i MJ10-22-CS25 cable (programming cable) for modbus communication between my PC to M91-2-T38? thanks, Nikita1
  5. Hello, Thanks all for you help in this forums, I see lot of informations that I will use for my first project with Unitronics IHM. My application is simple for most of Unitronics user but for me it is a little "hard" My project : - I have a V130-33-R34 module with an interface IO-AI4-AO2 - I will connect 2 Ana 4-20mA inputs to the V130 and 3 Ana 4-20mA inputs to the IO interface. - I will use 2 Ana Outputs 4-20 mA to the IO Interface too. The application is to transfert the 5 analogic inputs to the modbus. And have the analogic value on one or several screen(s) only for local informati
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