Mitsubishi MELSEC LJ71C24, User Manual

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11 DATA COMMUNICATION USING THE BIDIRECTIONAL PROTOCOL
11.1.4 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 occurred for the no-reception monitoring time (timer 0).
A timeout occurred for the transmission monitoring time (timer 2).
Data that could not be converted with the ASCII-BIN conversion was detected.
User's Manual (Application)
Received the data length that was too long to store in the receive area. Section 11.1.2
Simultaneous transmissions occurred. Section 11.3
(1) Confirmation using the sequence program
(a) Detecting the occurrence of a reception error
ERR. occurrence (XE/XF) is on.
(b) Confirming a reception error
The receive error code is confirmed and read in data reception result
(address: 258
H
/268
H
).
POINT
For details of how to check the error code contents and corrective actions, refer to
Chapter 15.