9 Application Instructions API 150-199 Program Example 3: 1. Sending the function code K3(H03) through COM2 (RS-485) (H04 is used the same as H03.): For reading many data in register When PLC is connected to VFD-S AC motor drive: M1143 = Off, in ASCII mode 2. When in ASCII mode, the received data will be stored in the designated registers starting from D0 in ASCII When PLC is connected to VFD-S AC motor drive: M1143 = On, in RTU mode format and PLC will automatically convert the data into hex value and store them in special registers D1296 ~ D1311. When the conversion into hex value starts, M1131 will be On and turn Off when the conversion is completed. 3.
If necessary, the user can move the hex values stored in D1296 ~ D1131 to other general registers by using MOV, DMOV or BMOV instruction. Other instructions of ES/EX/SS do not function on the data in D1296 ~ D1311. 4. When in RTU mode, the received data will be stored in the designated registers starting from D0 in hex format. 5. When In ASCII mode or RTU mode, PLC will store the data to be sent in D1256 ~ D1295. If necessary, the user can move the data to other general registers by using MOV, DMOV or BMOV instruction. Other instructions of ES/EX/SS do not function on the data in D1256 ~ D1295. 6. The data sent back from AC motor drive are stored in the registers designated by the user.
After the transmission is completed, PLC will auto-check if the received data are incorrect. M1140 will be On if there is an error. 7. 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. 8. 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. DVP-PLC Application Manual 9-8