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FX Series Programmable Controllers Basic Program Instructions 2
2-17
2.15 Set and Reset
Program example:
Basic points to remember:
- Turnin
g
ON X0 causes Y0 to turn ON.
Y0 remains ON even after X0 turns OFF.
- Turnin
g
ON X1 causes Y0 to turn OFF.
Y0 remains OFF even after X1 turns
OFF.
- SET and RST instructions can be used
for the same device as man
y
times as
necessar
y
.
However, the last instruction activated
determines the current status.
- It is also possible to use the RST instruction to reset the contents of data devices such
as data re
g
isters, index re
g
isters etc. The effect is similar to movin
g
‘K0’ into the data
device.
Mnemonic Function Format Devices Program steps
SET
(SET)
Sets a bit device
permanentl
y
ON
Y, M, S
Y,M:1
S, special M
coils:2
RST
(ReSeT)
Resets a bit
device
permanentl
y
OFF
Y, M, S, D, V, Z
(see section
2.16 for timers
and counters
T,C)
D, special D
re
g
isters, V and
Z:3
SET
RST
X0
SET Y0
X1
RST Y0
X2
SET M0
X3
RST M0
X4
SET S0
X5
RST S0
X6
RST D0
X
Y
X
Y
X
M
X
M
0
0
0
2
0
3
0
LD
SET
LD
RST
LD
RST
SET
LD
0
1
3
4
6
7
5
2
8
9
10
11
12
LD
SET
LD
RST
LD
RST
13
X
S
X
S
X
D
1
4
0
5
0
6
0
X0
X1
Y0
Resetting timers and counters:
• Please see next pa
g
e.