36
When constructing a failsafe circuit using ondelay timers only
*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.
*1 Use a solid state relay for the M1 relay.
to
to
-+
*1
0BY
Externai load
CM
2M
2M
M1
M1
2T
2M
s1
On-delay timer
2T
0V
24V
FBY
1BY
24VDC
T1
MC
L
L
Output moduleCPU module
s0.5 s0.5
0BY
0BY
M1
s1
On-delay timer
T1
2M903
Internal program
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