9 Application Instructions API 150-199 5. After receiving the data sent back from AC motor drive is completed, PLC will auto-check if the received data are incorrect. M1140 will be On if there is an error. 6. If the device address is illegal to a designated communication device, the communication device will respond with an error message and PLC will store the error code in D1130 and M1141 = On. For example, if 8000H is illegal to VFD-S, M1141 will be On and D1130 = 2. See user manual of VFD-S for error codes. 7. After M1140 = On or M1141 = On, PLC will send another correct datum to AC motor drive. If the data sent back from AC motor drive is correct, M1140 and M1141 will be reset.
M1002 Set up communication protocol 9600, 8, E, 1 Retain communication protocol Communication time-out 100ms M1143 X10 X0 Set up sending request X0 Address of communi- cation device K1 Function code K6: write 1 word datum Data address H2000 Register for storing the data Data length (word) M1127 Process of received data ASCII mode: the received data will be stored in special registers D1070 ~ D1076 in ASCII format. RTU mode: the received data will be stored in special registers D1070 ~ D1077 in hex format. Sending/receiving of data is completed. The flag is reset. 8. ASCII Mode: When PLC is connected to VFD-S AC motor drive. PLC VFD-S, PLC sends:
“01 06 0100 1770 71” VFD-S PLC, PLC receives: “01 06 0100 1770 71” Registers for sent data (sending messages) DVP-PLC Application Manual 9-18 MOV H87 D1120 SET M1120 MOV K100 D1129 SET M1122 MODRW K1 K6 H2000 D50 K1 RST M1127 Register DATA Explanation D1256 Low ‘0’ 30 H ADR 1 ADR 0 Address of AC motor drive: ADR (1,0) D1256 High ‘1’ 31 H D1257 Low ‘0’ 30 H CMD 1 CMD 0 Command code:
CMD (1,0) D1257 High ‘6’ 36 H D1258 Low ‘0’ 30 H Data Address D1258 High ‘1’ 31 H D1259 Low ‘0’ 30 H D1259 High ‘0’ 30 H D1260 Low ‘1’ 31 H Data content The content of register D50 (H1770 = K6,000) D1260 High ‘7’ 37 H D1261 Low ‘7’ 37 H D1261 High ‘0’ 30 H D1262 Low ‘7’ 37 H LRC CHK 1 LRC CHK 0 LRC CHK (0,1) is error check D1262 High ‘1’ 31 H