Mitsubishi MELSEC LJ71C24, User Manual

Page: 195 / 428

11 - 9 11 - 9
11 DATA COMMUNICATION USING THE BIDIRECTIONAL PROTOCOL
(e) Error code
The error code indicates the definition of the error during NAK response.
(For details on the error codes, refer to Chapter 15.)
1) For data communication from the external device to the C24
For error codes from the external device, transmit the codes specified by
the user.
The error codes (0022
H
to 005F
H
) that are not used by the C24 can be
used.
The C24 stores the received error codes as a completion status in the
control code for the BIDOUT instruction.
They are also stored in Data transmission result (address: 257
H
).
2) For data communication from the C24 to the external device
The error codes are added by the C24.
When an error code is transmitted, the C24 writes the same error code
in Data reception result (address: 258
H
).