Mitsubishi Electric MELSEC FX Series - 1.3.5 Handling of operation error flag

1 Outline
1.3 Cautions on Creation of Fundamental Programs
23
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
1
Outline
2
Instruction List
3
Configuration of Instruction
4
How to Read Explanation of Instructions
5
Basic Instruction
6
Step Ladder Instructions
7
Applied Instructions
8
Interrupt Function and Pulse Catch Function
A
Relationships between devices and addresses
1.3.5 Handling of operation error flag
When there is an error in the sequence instruction configuration, 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 store.
1. Operation error
*1. When the error occurrence step is up to the 32767th step in FX3U and FX3UC PLCs, the error
occurrence step can be checked in D8069 (16 bits).
• When an operation error has occurred, M8067 is set, D8067 stores the operation error code number, and
the device storing error occurrence step (see the table above) stores the error occurrence step number.
• If 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 switches from STOP to RUN, these devices are cleared instantaneously, and then
set to ON again if errors have not been cleared.
2. Operation error latch
*2. When the error occurrence step is up to the 32767th step in FX3U and FX3UC PLCs, the error
occurrence step can be checked in D8068 (16 bits).
• When an operation error has occurred, M8068 is set, and the device storing error occurrence step (see the
table above) stores the error occurrence step number.
• Even if another error has occurred in another step, the stored data is not updated, and remains held until
these devices are forcibly reset or until the power turns OFF.
Error flag Device storing error code
Device storing 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 storing error code
Device storing error occurrence step
FX0/FX0S/FX0N/FXU/FX2C/FX1S
/FX1N/FX2N/FX1NC/FX2NC/FX3G
FX3U/FX3UC
M8068 -
D8068
*2
D8313, D8312