how do i configure the com 1 of plc pm556 for communication rs485 with HMI Delta?
ME ENTREGARON UN PROYECTO EN EL CUAL TENGO UN PLC PM556 Y UNA HMI DELTA DOP -B07S515 Y TENGO QUE COMUNICARLOS POR MEDIO DE RS485, TENGO EN DUDA EN LA CONFIGURACION DEL PLC Y LAS PALABRAS O BITS QUE DEBO DE UTILIZAR
I HAVE GIVEN A PROJECT IN WHICH I HAVE A PLC PM556 AND A HMI DELTA DOP -B07S515 AND I HAVE TO COMMUNICATE THEM THROUGH RS485, I HAVE IN DOUBT IN THE PLC CONFIGURATION AND THE WORDS OR BITS THAT I MUST USE
Check what protocol(s) supports your HMI. It seems that DOP-B07S515 is an operator panel, but at first look I found only a limited tech specification for it.
You can use integrated COM port in the CPU with RS485 and Modbus RTU. It depends what the panel can read, it should supports both bits and words - you have to check that. Usually HMI is a master in serial link, and from PM556 you can read/write both bits (%MX...) and words (%MW....).
PM556 has integrated Ethernet as a standard, I think no version of this type CPU without Ethernet.
It will be much easier to use Modbus TCP protocol, if the panel has Ethernet port with Modbus TCP.
What I found is that DOP -B07S515 (may be) have no Ethernet port - so you have to use serial port.