Handling Of Operation Error Flag - Mitsubishi Electric MELSEC FX Series Structured Programming Manual

FXCPU Structured Programming Manual
(Application Functions)
1.3.5

Handling of operation error flag

When there is an error in the instruction construction, target device or target device number range and an
error occurs while operation is executed, the following flag turns ON and the error information is stored.
1. Operation error
Error flag
M8067
*1. When an error occurs in a step up to the step No. 32767 in the FX
error occurrence step also in D8069 (16 bits).
• When an operation error has occurred, M8067 turns ON, D8067 stores the operation error code, and the
specified device (shown in the table above) stores the error occurrence step.
• When another error occurs in another step, the stored data is updated in turn to the error code and step
number of the new error. (These devices are set to OFF when errors are cleared.)
• When the PLC mode changes from STOP to RUN, these devices are cleared instantaneously, and then
turn ON again if errors have not been cleared.
2. Operation error latch
Error flag
M8068
*2. When an error occurs in a step up to the step No. 32767 in the FX
error occurrence step also in D8068 (16 bits).
• When an operation error has occurred, M8068 turns ON, and the device shown in the table above stores
the error occurrence step.
• Even if another error occurs in another step, the stored data is not updated and remains held until these
devices are forcibly set to OFF or until the power is turned OFF.
Device which stores
FX
error code
/FX
D8067
Device which stores
FX
error code
/FX
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1.3 Cautions on Creation of Fundamental Programs
Device which stores error occurrence step
/FX /FX /FX /FX /FX
0 0S 0N U 2C 1S
/FX /FX /FX /FX
1N 2N 1NC 2NC 3G
*1
D8069
/FX
3U
Device which stores error occurrence step
0 /FX 0S /FX 0N /FX U /FX 2C /FX 1S
/FX /FX /FX /FX
1N 2N 1NC 2NC 3G
*2
D8068
/FX
3U
1 Outline
FX 3U /FX 3UC
D8315, D8314
PLC, you can check the
3UC
FX /FX
3U 3UC
D8313, D8312
PLC, you can check the
3UC
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A