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1 Outline
1.3 Cautions on Creation of Fundamental Programs
21
FXCPU Structured Programming Manual
(Application Functions)
1
Outline
2
Function List
3
Function
Construction
4
How to Read
Explanation of
Functions
5
Applied
Functions
6
Standard
Function Blocks
A
Correspondence
between Devices
and Addresses
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
*1. When an error occurs in a step up to the step No. 32767 in the FX3U/FX3UC PLC, you can check the
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
*2. When an error occurs in a step up to the step No. 32767 in the FX3U/FX3UC PLC, you can check the
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.
Error flag
Device which stores
error code
Device which stores error occurrence step
FX0/FX0S/FX0N/FXU/FX2C/FX1S
/FX1N/FX2N/FX1NC/FX2NC/FX3G
FX3U/FX3UC
M8067 D8067
D8069
*1
D8315, D8314
Error flag
Device which stores
error code
Device which stores error occurrence step
FX0/FX0S/FX0N/FXU/FX2C/FX1S
/FX1N/FX2N/FX1NC/FX2NC/FX3G
FX3U/FX3UC
M8068 -
D8068
*2
D8313, D8312