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DVP-ES2/EX2/SS2/SA2/SX2/SE Operation Manual - Programming
3-210
Receving data: (External equipment→PLC)
D120L D122L D123L D124L D125L D126LD121L
Registers for r starting from
lower 8 bits of D120
eceived data,
Length = 7
Program Example 6: COM3 RS-485
1. Only 8-bit mode is supported. Communication format and speed are specified by lower 8 bits
of D1109.
2. STX/ETX setting function (M1126/M1130/D1124~D1126) is not supported.
3. High byte of 16-bit data is not available. Only low byte is valid for data communication.
4. Write the data to be transmitted in advance into registers starting from D100 and set M1316
(COM3 sending request) as ON
5. When X10 = ON, RS instruction executes and PLC is ready for communication. D0 will then
start to send out 4 data continuously. When data sending is over, M1318 will be automatically
reset. (DO NOT apply RST M1318 in program). After approximate 1ms, PLC will start to
receive 7 data and store the data in 7 consecutive registers starting from D20.
6. When data receiving is completed, M1318 will automatically be ON. When data processing on
the received data is completed, M1318 has to be reset (OFF) and the PLC will be ready for
communication again. However, DO NOT continuously execute RST M1318, i.e. it is
suggested to connect the RST M1318 instruction after the drive contact M1318
.
Receiving completed and flag reset
Setting communication protocol as 9600,8,E,1
Retain communication protocol
Set up communication time out as 100ms
M1002
MOV H87 D1120
SET M1136
MOV K100 D1252
X0
RS
D100
K4
D120
K7
M1318
Processing received data
RST M1318
Pulse for
sending request
Pulse
Write transmitting data in advance
Sending request
SET
M1316