Mitsubishi Electric MELDAS C6 Programming Manual page 397

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;
Always ON
M10E M10F
M10E M10F M1
M10E M10F
M10E M10F M2
M10E M10F
Always ON
Switch 15 on
R38 bitE
(a)
R38 bitF
R138 bitE
R138 bitF
M1
M2
SM94
SM95
11. PLC Help Function
11.3 PLC Switches
MOV R38 K4M100
M20E
RST M1
SM94
RST M1
M20F
RST M2
SM95
RST M2
RST M1
RST M2
MOV K4M200 R138
Switch 16 on
(b) (c) (d)
1 scan width
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Chip conveyer manual
Switch 15 highlight signal
Chip conveyer automatic
Switch 16 highlight signal
Switch 15 on
(a) When switch 15 (R38 bitE) is on and
switch 16 (R38 bitF) is off, R138 bitE
and M1 turn on. [Initial state]
(e)
(b) When switch 16 (R38 bitF) turns on
while being in state (a), R138 bitE turns
(f)
(g)
off, SM94 turns on, and M1 turns off.
(c) Turning SM94 on reverses R38 bitE
(to off).
(d) When R38 bitE is off and R38 bitF is
on,SM94 turns off and R138 bitF and M2
turn on.
(e) When switch 15 (R38 bitE) turns on
while being in state (d), R138 bitF turns
off, SM95 turns on, and M2 turns off.
(f) Turning SM95 on reverses R38 bitF
(to off).
(g) When R38 bitF is off and R38 bitE is
on, SM95 turns off and R138 bitE and
M1 turn on again.