12. Communication Design Examples M0 Sending request M1 M2 M3 M4 M1000 Send out the 17 bytes data in D100~D108 and store the received 17 bytes data in D120~D128 M1123 Reset M1123 M1129 Retry after receiving time-out Reset M1129 Program Description: z Initialize PLC RS-485 communication port and set the communication format as MODBUS ASCII, 9600, 7, E, 1. The RS-485 communication format of Slave should be the same with Master PLC. z There are 2 situations for RS communication: M1123 for normal communication and M1129 for receiving timeout. When communication time-out occurred, M4 can be used to retry. z When X0 = ON, Slave 1 will start running. When X0 = OFF, Slave 1 will stop.
z When X1 = ON, Slave 2 will start running. When X1 = OFF, Slave 2 will stop. DVP-PLC Application Examples 12-44 SET M1122 RS D100 K17 D120 K17 RST M1123 PLS M4 RST M1129