12. Communication Design Examples 12.13 Communication between Delta PLC and Siemens MM420 Frequency Inverter (RS Instruction) Control Purpose: z Controlling the start/stop of Siemens MM420 series AC motor drive through communication by master PLC. Parameter Settings for MM420 AC Motor Drive: Ъ If Siemens MM420 can not run normally due to improper parameters, users can set MM420 to factory defaults: set P0010 = 30, P0970 = 1. Then set the parameters according to the above table. Devices: Control Program:
X0 When X0 = ON, send the data which starts MM 420 to run forward in 40Hz to D100~D103 X0 When X0 = OFF, send the data which stops MM 420 to D100~D103 DVP-PLC Application Examples 12-45 Parameter Set value Function P0003 3 User access level: expert P0700 5 Selection of command source: USS on COM link (RS-485) P1000 5 Selection of frequency setpoint: USS on COM link (RS-485) P2010 6 USS baud rate: 9600bps P2011 0 USS address: 0 Device Function X0 Start/stop switch MOV H602 D100 MOV H400 D101 MOV H337F D102 MOV H7F33 D103 PLS M0 MOV H602 D100 MOV H400 D101 MOV H7A D102 MOV H7A00 D103 PLS M1