DVP-ES2-EX2-SS2-SA2-SX2-Operation Manual

3. Instruction Set
3. In ASCII or RTU mode, when PLC’s COM2 sends out data, the data will be stored in
D1256~D1295. The feedback data will be stored in registers starting with S and converted into
D1296~D1311 in Hex automatically.
4. Take the connection between PLC1 (PLC COM2) and PLC2(PLC COM1) for example, the
tables below explains the status when PLC1 reads Y0~Y17 of PLC2.
M1002
MOV
H87
D1120
Set communication protocol as 9600, 8, E, 1
SET
M1120
Retain communication protocol
MOV
K100
D1129
Set communication timeout as 100ms
X0
X0
RST
SET
MODRW
M1143
M1122
K1
K2
Receiving completed
M1127
Processing received data
M1143 = OFF
ASCII mode
Sending request
SET
H0500 D0 K16
M1143
M1143 = ON
RTU mode
Data length (bit)
Data storing register
Data address Y0=H0500
Function code K2
read multiple bits
Connection device
address K1
ASCII mode: The received data is stored in registers starting from D0 in ASCII format and
PLC converts the content to registers D1296~D1311 in hexadecimal automatically.
RTU mode: The received data is stored in registers starting from D0 in Hex.
RST
M1127
Reset M1127
ASCII Mode (M1143 = OFF):
When X0 = ON, MODRW instruction executes the function specified by Function Code 02.
PLC1 PLC2,PLC1 sends: “01 02 0500 0010 E8”
PLC2 PLC1,PLC1 receives: “01 02 02 3412 B5”
Registers for data to be sent (sending messages)
Register Data Descriptions
D1256 Low ‘0’ 30 H ADR 1
D1256 High ‘1’ 31 H ADR 0
Device address: ADR (1,0)
D1257 Low ‘0’ 30 H CMD 1
D1257 High ‘2’ 32 H CMD 0
Control parameter: CMD (1,0)
D1258 Low ‘0’ 30 H
D1258 High ‘5’ 35 H Y0 = H0500
D1259 Low ‘0’ 30 H Starting Data Address
D1259 High ‘0’ 30 H
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