Mitsubishi MELSEC LJ71C24, User Manual

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11 DATA COMMUNICATION USING THE BIDIRECTIONAL PROTOCOL
C24 ready (X1E)
Transmission instruction
BIDOUT instruction
BIDOUT instruction complete device
BIDOUT instruction complete 1
(Normal completion/abnormal completion)
Transmission data count (address: 400
H
)
Transmission data (address: 401
H
to)
BIDOUT
1 scan
0 n
Transmission data
Data transmission
1)
2)
3)
4)
ON when transmission
abnormal completion
Receiving response
1) Starts the host station programmable controller.
The setting values in GX Works2 are stored in the C24.
2) Inputs the user data transmission instruction signal.
3) Executes the BIDOUT instruction after storing the transmission data and the
control data for the BIDOUT instruction in the device.
Data is sent when the BIDOUT instruction is executed.
4) A response message for the data transmission (for normal completion: ACK
message; for abnormal completion: NAK message) is received.
5) When the response is received, the C24 transmission processing completes and
the device that has completed the BIDOUT instruction turns ON.
When the BIDOUT instruction ends abnormally due to the reception of an NAK
message, the complete 1 (abnormal completion signal) turns ON and the
error code is stored in the control data completion status (S1+1).