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16.4 Error Code List
16.4.1 Error codes and actions (for errors occurred in function execution)
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TROUBLESHOOTING
16.4 Error Code List
This section explains error codes that are returned upon error occurrence.
16.4.1
Error codes and actions (for errors occurred in function execution)
The error codes returned in bus interface or MELSEC data link function execution are
returned as a return value.
(1) Common error codes returned by bus interface functions and MELSEC
data link functions
The following table provides the error descriptions and corrective actions to individual
error code commonly returned in execution of bus interface functions and MELSEC
data link functions.
* 1 In a single CPU system, reset the C Controller module.
In a multiple CPU system, reset CPU No. 1.
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Table 16.8 Common error codes returned by bus interface and MELSEC data link functions
Return value
(HEX)
Error description
Corrective action
0
Completed normally
1
(0x1)
Driver not started
The driver has not been started.
Correct the error that occurred when starting
the driver.
Check the status of the standard ROM and
system ROM.
Check if the operating system is running
normally.
2
(0x2)
Timeout error
A timeout occurred while waiting for response.
Check the operation status and mounting
condition of the accessed station(s).
Retry from the user program.
Increase MD function timeout value in C
Controller setting utility.
66
(0x42)
Already opened
The specified channel has already been opened.
Open once.
67
(0x43)
Already closed
The specified channel has already been closed.
Close once.
69
(0x45)
Processing code error
An unsupported processing code was issued.
Use the supported processing code.
70
(0x46)
Station No. error
The specified station No. is incorrect.
This station received a request destined for another station. Or, the
station No. corresponds to the own station (0xFF) but the network
No. is not 0.
Correct the station No. in the user program.
71
(0x47)
Data reception error (When a RECV request is issued.)
Data have not been received.
Wait until data are received.
77
(0x4D)
Memory error
Sufficient memory could not be allocated.
Terminate other task(s) currently running, or
decrease the size of data to be accessed.
Check if the operating system is running
normally.
Reboot the operating system.
*1
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