Mitsubishi-electric QJ71C24N Manuel d'utilisateur télécharger pdf (Page 161)

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MELSEC-Q

7 DATA COMMUNICATIONS USING BIDIRECTIONAL PROTOCOL

7.1.3 Sequence program for data reception

This section explains the sequence program for data reception.

For details on the BIDIN instruction for data reception, see Chapter 9.

X3 Read request

Create control data from D0

G.BIDIN Un D0 D10 M0

M0 M1

(CH1)

Processing for normal completion

(stores receive data, etc.)

(X1E)

(X3)

Reception data read

request signal

BIDIN instruction

BIDIN instruction complete device

BIDIN instruction complete device +1

(Normal completion)

Receive data count storage area

(Buffer memory address: 600

)

Receive data storage area

(Buffer memory address: 601

to 7FF

)

Receive data

One scan

Response transmissionData reception

Q series C24 ready signal

BIDIN

(OFF)

1) Start the local station PLC.

The values specified with GX Developer are stored in the Q series C24.

2) When data is received from the external device, the reception data read request

signal turns ON.

3) After the control data for the BIDIN instruction is stored in the device, the sequence

program executes the BIDIN instruction and reads the receive data.

4) When the reading of receive data is completed, a response message (ACK

message when the operation was completed normally) is sent and the device that

has completed the BIDIN instruction turns ON.

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Mitsubishi-electric QJ71C24N Manuel d'utilisateur Page 161

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