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10. PLC Help Function
- 266 -
The following shows an example of operation of special relay SM from the user PLC.
(1) Two-point switch
(Example)
When two opposite switches, chip conveyer manual and chip conveyer automatic,
are provided;
Y16E
Y16F
SET M1
SM94
RST M1
SET M2
SM95
RST M2
X14E
X14E
X14E
M1
M2
X14F
X14F
RST M2
RST
M1
X14F
X14E
X14F
X14E X14F
Chip conveyer manual
X14E reversing signal
Chip conveyer automatic
X14F reversing signal
X14E
X14F
Y16E
Y16F
M1
M2
SM94
SM95
1 scan width
(a) (b) (c) (d)
(e)
(g)
(f)
Switch 15 on Switch 16 on Switch 15 on
(a) When switch 15 (X14E) is on and
switch 16 (X14F) is off, Y16E and
M1 turn on. [Initial state]
(b) When switch 16 (X14F) turns on
while being in state (a), Y16E turns
off, SM94 turns on, and M1 turns off.
(c)
Turning SM94 on reverses X14E (to off).
(d)
When X14E is off and X14F is on,
SM94 turns off and Y16F and M2
turn on.
(e)
When switch 15 (X14E) turns on
while being in state (d), Y16F turns
off, SM95 turns on, and M2 turns off.
(f)
Turning SM95 on reverses X14F (to off).
(g)
When X14F is off and X14E is on,
SM95 turns off and Y16E and M1
turn on again.