Справочник Пользователя для Mitsubishi Electronics Mitsubishi Digital Electronics Welding System FXCPU

1 Outline

FXCPU Structured Programming Manual
(Application Functions)

A circuit in which the current flows in both directions should be changed as shown in the right figure (so that a
circuit without D and a circuit without B are connected in parallel).

• You can program a contact on the right side of a coil. In this case, make sure to program a coil (including a 

function or function block) at the end of the circuit.

The following flags are valid in general sequence instructions:
(Examples)
M8020:Zero flag

M8021:Borrow flag

M8022:Carry flag

M8029:Instruction execution complete flag

M8090:Block comparison signal

*1

M8328:Instruction non-execution flag

*1

M8329:Instruction execution abnormal complete flag

*2

M8304:Zero flag

*1

M8306:Carry flag

*1

*1.

Supported only in FX

3U

/FX

3UC

 PLCs.

*2.

Supported only in FX

3U

/FX

3UC

/FX

3G

 PLCs.

Each of these flags turns ON or OFF every time the PLC executes a corresponding instruction. These flags
do not turn ON or OFF when the PLC does not execute a corresponding instruction or when an error occurs.
Because these flags are related to many sequence instructions, their ON/OFF status changes every time the
PLC executes each corresponding instruction.
Refer to examples in the next page, and program a flag contact just under the target sequence instruction.

A

B

C

E

D

C

E

A

B

A

E

C

D

F

F

Or

A

B

D

A

B

D

C

E

C

E

A

B

E

D

C