Mitsubishi MELSEC LJ71C24, User Manual

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10 DATA COMMUNICATION USING THE NONPROCEDURAL PROTOCOL
10.2.4 How to detect and confirm transmission errors
This section explains how to detect and confirm errors that may occur when sending
data to external devices.
The following items are considered as the primary causes of errors that may occur
during data transmission.
Cause of reception error Reference
A timeout occurred for the transmission monitoring time (timer 2). User's Manual (Application)
Designated number of transmission data was larger than the size that could be stored in the
transmission area.
Section 6.2.2
(1) Confirmation using the sequence program
(a) Detecting a transmission error
The following device and input signal turn ON.
• OUTPUT instruction complete 1
• ERR. occurrence (XE/XF)
(b) Confirming a transmission error
The transmission error code can be checked using the OUTPUT instruction
control data ((S1) + 1).
Or, it can be checked by reading the data transmission result (address:
257
H
/267
H
).
POINT
For details on how to check the error code contents and corrective actions, refer to
Chapter 15.