CCB BLOCKS

[Guest Guest_Solonel]

Hi, I chose to use PCM711 to communicate with a device via the rtu master protocol. So i installed it (using termf) and i 've been told that i have also to configure CCB blocks to achieve the succesfull communication between the cpu and the pcm. I have no idea how to do this. I assume that this can be done using the ladder. Any ideas? Thanks in advance, Solonas

[Steve Bailey 118]

If the PCM can be in charge of the data transfer, you won't need any additional ladder logic. In your MegaBasic program in the PCM, use the SYSLINK command to link a BASIC variable with a PLC address. Then use the SYSREAD command to read data from the PLC into the BASIC variable, and the SYSWRITE command to write from the BASIC variable to the PLC. If you need the PLC to control when to read and write between ladder logic and the PCM, then you will need to use the COMREQ function in ladder logic.