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3. Instruction Set
3-269
Program Example 1:
Communication between PLC and VFD-B series AC motor drives (ASCII Mode, M1143 = OFF)
MOV D1120H87
M1002
SET M1120
M1127
Receiving
completed
Set communication protocol as 9600, 8, E, 1
Retain communication protocol
Set receiving time-out as 100ms
Processing received data
Reset M1127
Sending request
X1
X0
MODRD K1 H2101 K6
Set communication instruction:
D
Data address: H2101
D
ata length: 6 words
evice address: 01
PLC converts the received ASCII data in
D1070~D1085 into Hex data and stores them
into D1050~D1055
MOV D1129
K100
SET M1122
RST
M1127
PLC → VFD-B , PLC transmits: “01 03 2101 0006 D4”
VFD-B → PLC , PLC receives: “01 03 0C 0100 1766 0000 0000 0136 0000 3B”
Registers for data to be sent (sending messages)
Register Data Descriptions
D1089 low byte ‘0’ 30 H ADR 1
D1089 high byte ‘1’ 31 H ADR 0
Address of AC motor drive:
ADR (1,0)
D1090 low byte ‘0’ 30 H CMD 1
D1090 high byte ‘3’ 33 H CMD 0
Command code: CMD (1,0)
D1091 low byte 2’ 32 H
D1091 high byte ‘1’ 31 H
D1092 low byte ‘0’ 30 H
D1092 high byte ‘1’ 31 H
Starting data address
D1093 low byte ‘0’ 30 H
D1093 high byte ‘0’ 30 H
D1094 low byte ‘0’ 30 H
D1094 high byte ‘6’ 36 H
Number of data (count by word)
D1095 low byte ‘D’ 44 H LRC CHK 1
D1095 high byte ‘4’ 34 H LRC CHK 0
Checksum: LRC CHK (0,1)