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*2
Since YB0 turns ON and OFF alternatively at 0.5 second
intervals, use a contactless output module (a transistor is used in
the above example).
*3
If an offdelay timer (especially miniature timer) is not available,
construct the failsafe circuit using an ondelay timer shown on the
next page.
When constructing a failsafe circuit using ondelay timers only
Internal program
M903
2
Y
B
Y
B
0
0.5
s
0.5
s
CPU module
*1
Use a solid state relay for the M1 relay.
Y
B
0
0
Y
B
1
to
Y
B
F
24V
0V
Output module
36
On-delay timer
T1
1
s
*1
M1
On-delay timer
M1
T
2
1
s
M1
M
2
T
2
M
2
Externai load
M
C
L
to
L
- +
24VDC
M
2
T1
MC
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