Chapter 3 PLC System Configuration & Settings same, and the devices where data which will be sent is stored cannot overlap the devices where data which will be received is stored. If the IP address of the remote device is 192.168.1.100, the port number used by the remote device is 65500, and the port number used by the local CPU module is 65501, the remote device and the local CPU module can transmit data through this TCP connection. If the local CPU module wants to send 10-word data to the remote device, the data will be stored in D0~D9 before the data is sent. If the local CPU module receives 20-word data from the remote device, the data will be stored in D100~D119.
If the length of data received is larger than the length set, the first 20-word data will be stored in D100~D119, and the data after the first 20-word data will be discarded. Likewise, if the length of data received is less than the length set, the data will be stored in the devices starting from D100, and the values in devices where no new data is stored will be retained. If no data is transmitted, and 60 seconds have elapsed, the CPU module will close the socket, and terminate the connection. 3.1.4.13 Ethernet Port Advance Setting – RTU Mapping In the RTU Mapping table, users can set Delta RTU-EN01 slave in connection with PLC CPU. The remote device can be controlled via Ethernet.
For the setting and operation of RTU-EN01, refer to the operation manual. Select RTU Mapping Enable checkbox to enable the function of connection between RTU module and PLC CPU. Set the update cycle in Cycle box and a timeout in Timeout box. It means a timeout when RTU does not give a reply within the timeout set. The data mapping between each group of RTU-EN01 and PLC CPU is set in the RTU Mapping section. RTU-EN01 and I/O module connected to it are set via DCISoft. For more information on DCISoft, refer to the operation manual. 3-103