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FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (RS/RS2 Instruction)
8.2.2
Function and operation
RS2 instruction specifies the head device storing the send data from the PLC, amount of data, head device
storing the received data and maximum allowable amount of received data.
Create a program as shown below.
Command
M0
FNC 87
RS2
When the command contact (M0) is set to ON, the PLC waits for sending and receiving.
For handling of sent and received data, refer to Subsection 8.2.3.
Sending
command
(pulse operation
type)
M1
When the sending command (M1) is set to ON, write the send data to D100 and later (as many
devices as the specified amount). Give the sending command of the pulse operation type.
After writing the send data, set the sending request device (M8402) to send the data.
When sending is completed, the sending request device (M8402) is automatically reset. Do not reset
it in a sequence program.
For the operation when data is sent, refer to Subsection 8.2.4.
Receiving
complete
M8403
When the PLC receives data from the connected equipment, the receiving complete flag (M8403)
turns ON.
When M8403 turns ON, move the received data stored in D200 to another storage area.
After moving the received data, reset the receiving complete flag (M8403).
While M8403 is ON, the PLC cannot receive the next set of receive data.
For the operation when data is received, refer to Subsection 8.2.5.
D100
D0
D200
Send data is written.
SET
Receive data is moved.
RST
8 Creating Programs (RS2 Instruction)
K30
K1
Sending
request
M8402
Receiving
complete
M8403
8.2 How to Use RS2 Instruction
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F-65
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