Mitsubishi MELSEC-F FX-TRN-BEG-E, User Manual, Page: 45 / 164

FX-TRN-BEG-E B: Let’s Study the Basics 2
B-17
3) How to write dual coils and auxiliary relays
’Writing dual coils’ means to construct a program with two or more control steps for the
same output.
If you wish to control an identical output with multiple input conditions, try to combine the
input conditions as in the program below.
Tips for using auxiliary relays
Auxiliary relays are convenient when avoiding dual coils as shown or when writing
similar input conditions as shown below.
Instruction words
LD (load) : NO contact starting from a bus
LDI (load inverse) : NC contact starting from a bus
AND (and) : NO contact connected in serial to a contact LD (or LDI)
ANI (and inverse) : NC contact connected in serial to a contact LD (or LDI)
OR (or) : NO contact connected in parallel to a contact LD (or LDI)
ORI (or inverse) : NC contact connected in parallel to a contact LD (or LDI)
OUT (out) : Coil drive instruction
* For the method to enter instruction words, refer to the ’LADDER PROGRAMS’ section or to
Appendix 1.
X000
Y000
X002
Y000
X000
Y000
X002
or
X000
M0
X002
M1
M0
Y000
M1
The output Y000 is controlled with both inputs
X000 and X002.
Example in which auxiliary relays are used
*
Example of dual coil
X000
Y000
X000
M0
M0
Y000
M0
Y001
M0
Example in which auxiliary relays are used Example in which auxiliary relay is not used
X001 X002 X003
X000
Y001
X001 X002 X004
X000
Y002
X001 X002 X005
Same set of contacts are used.
X001 X002
X003
X004
X005
Y002
The program is simplified.
The same OUT instruction should not be
operated by multiple input contacts, but the
identical input contact can be used many times
for different OUT instructions.