12. Communication Design Examples 12.3 Communication between PLC and Delta VFD-V Series AC Motor Drive (MODRD/MODWR) Control Purpose: z Repeatedly reading the master frequency and output frequency of VFD-V series AC motor drive by MODRD instruction. z Setting the drive to run forward in 30Hz by MODRW instruction when X0 is pressed. z Setting the drive to run in reverse in 20Hz by MODRW instruction when X1 is pressed. z Stopping the drive by MODWR instruction when X2 is pressed. Parameter Settings for VFD-V Series AC Motor Drive:
Ъ If AC motor drive can not run normally due to improper parameters, users can set P00-02 = 10 (factory defaults) and then set the parameters according to the above table. Devices: Control Program: M1002 Set communication format: 9600, 7, E, 1 Retain communication setting Set receiving time-out: 200ms ommunication mode: Reset D0 and D1 first when PLC runs. DVP-PLC Application Examples 12-11 Parameter Set value Explanation 00-20 1 Master frequency controlled by RS-485 communication. 00-21 0 Digital keypad (KPV-CE01) 09-00 01 Communication address: 01 09-01 9.6 Communication baud rate: 9600. 09-04 02 ASCII mode. Protocol: (7, E, 1).
Device Function X0 Forward X1 Reverse X2 Stop M0 Executing MODRD instruction to read master and output frequency M1 Executing MODWR instruction to set running direction and frequency MOV H86 D1120 SET M1120 Retain c MOV K200 D1129 Select c RST M1143 MODBU ZRST D0 D1 MOV H86 D1120 ZRST D0 D1 SET M1120 MOV K200 D1129 RST M1143