Computer Link; Nak Error Code; Programmable Controller Error Code; Diagnostics 12 - Mitsubishi Electric MELSEC FX Series User Manual

FX communication

12.4 Computer Link

12.4.1

NAK Error Code

The error code is sent following a NAK response to indicate the type of error that occurred. It is
transmitted as two ASCII characters representing the hexadecimal codes ranging from 00H to
FFH.
If two or more errors occur simultaneously, the error code with the lowest number is transmitted.
Error code
(hexadecimal)
00H, 01H
02H
03H
04H, 05H
06H
07H
,
08H 09H
0AH
0BH to 0FH
10H
to
11H 17H
18H
12.4.2

Programmable Controller Error Code

With the FX series programmable controllers, the following errors are not transmitted using a
NAK, but instead are shown at the programmable controller by switching on special auxiliary
relay M8063, and storing the error code in special data register D8063.
Error code
(in D8063)
6301
6305
6306
Because these errors are not transmitted it must be programmed at the computer so as to
recognize an error by using a watchdog timer or other monitor timer.
Sum error
Protocol error (the communication protocol does not conform to the format selected
with D8120)
Character area error (the character area is incorrectly defined, or the specified
command is not available)
Character error (the data to be written to a device consists of ASCII codes other than
hexadecimal codes)
PLC number error (the PLC number is not set to "FF" or not available from this station)
PLC number error (the PLC number is not set to "FF" or not available from this station)
Remote error (remote run/stop is disabled)
Parity, overrun, framing error
Command failure receiving a command other than GW (global) when the station
number is "FF"
Monitor timer over (message to be received is insufficient)
Error description





Error description

Diagnostics 12

12-4