Mitsubishi MELSEC LJ71C24, Руководство пользователя

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10 DATA COMMUNICATION USING THE NONPROCEDURAL PROTOCOL
10.1.4 How to detect and check the reception errors
This section explains how to detect and confirm errors that may occur when receiving
data from external devices.
The following items are considered as the primary causes of errors that may occur
during data reception.
Cause of reception error Reference
A transmission error occurred due to noise. Section 6.2, Section 6.3
A timeout for the no-reception monitoring (timer 0) occurred.
Received data that could not be converted using the ASCII-BIN conversion.
User's Manual (Application)
Received data larger than the size that could be stored in the OS area of the C24. Section 6.1.2
(1) Confirmation using the sequence program
(a) Detecting a reception error
The following device and input signals turn ON.
• INPUT instruction complete 1
• Reception abnormal detection (X4/XB)
• ERR. occurrence (XE/XF)
(b) Checking a reception error
The reception error code can be checked using the INPUT instruction
control data ((S1) + 1).
Or, it can be checked by reading the data reception result (address:
258
H
/268
H
).
POINT
For details on how to check the error code contents and corrective actions, refer to
Chapter 15.