8 Application Instructions API 100-149 Program Example 2: Communication between PLC and VFD-S series AC motor drives (RTU Mode, M1143 = On) M1002 Set up communication protocol 9600, 8, E, 1 Retain communication protocol Set up communication time-out: 100ms Set up as sending flag X0 Set up as RTU mode X0 Set up communication instruction device address 01 data address H2000 Write in data H12 Process of receiving data The received data in hex are stored in D1070 ~ D1085. M1127 Sending/receiving of data is completed. The flag is reset. receiving completed PLC VFD-S, PLC sends: 01 06 2000 0012 02 07 VFD-S PLC, PLC receives:
01 06 2000 0012 02 07 Registers for sent data (sending messages) Registers for received data (responding messages) Program Example 3: 1. In the communication between PLC and VFD-S series AC motor drive (ASCII Mode, M1143 = Off), retry when 2. When X0 = On, PLC will write H1770(K6000) into VFD-S data adress H0100 of device 01. communication time-out, data receiving error and sending address error occur. 3. M1129 will be On when communication time-out occurs. The program will trigger M1129 and send request to M1122 for writing the data again. 4. M1140 will be On when data receiving error occurs.
The program will trigger M1140 and send request to M1122 DVP-PLC Application Manual 8-7 MOV H87 D1120 SET M1120 MOV K100 D1129 SET M1143 SET M1122 MODWR K1 H2000 H12 RST M1127 Register DATA Explanation D1089 low 01 H Address D1090 low 06 H Function D1091 low 20 H Data address D1092 low 00 H D1093 low 00 H Data contents D1094 low 12 H D1095 low 02 H CRC CHK Low D1096 low 07 H CRC CHK High Register DATA Explanation D1070 low 01 H Address D1071 low 06 H Function D1072 low 20 H Data address D1073 low 00 H D1074 low 00 H Data contents D1075 low 12 H D1076 low 02 H CRC CHK Low D1077 low 07 H CRC CHK High