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

DVP-ES2/EX2/SS2/SA2/SX2/SE Operation Manual - Programming
Receving data: (External equipment→PLC)
D120L D121L D122L D123L D124L D125L D126L
Registers for received data, starting from
lower 8 bits of D120
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.
M1002
MOV H87 D1120 Setting communication protocol as 9600,8,E,1
SET
M1136
Retain communication protocol
Pulse for
sending request
Pulse
X0
M1318
MOV K100 D1252 Set up communication time out as 100ms
Write transmitting data in advance
SET M1316 Sending request
RS D100 K4 D120 K7
Processing received data
RST
M1318
Receiving completed and flag reset
3-210