Safety Integrated - Industry - Siemens

Ex. No.
3
Timing diagram
The timing diagram below (explanation is provided after the
diagram) illustrates the following case:
While the hazardous machine is active, the door is opened (by
force); during this process, the actuator breaks off the door
and gets stuck in the safety position switch.
RELEASE
START
SEP_ACT
HINGED_SW
ACTUATOR
ACT_PAS
COIL
t1
t2 t3 t4 t5
206 Functional Example No. AS-FE-I-003-V10-EN
t
t
t
t
t
t
t
G_FB_XX_105
Time t1 t2 t3 t4 t5
Bit
RELEASE Enable
given
START Start request
SEP_ACT Door
closed
Alternative
Enable
reset
Door
open,
howeveractuator
breaks
and
stays in
the position
switch
HINGED_SW Door
open,
ACTUATOR "Machine"rotates
Machine
stops
ACT_PAS Slowing
down
movement
"Machine"
in
STOP
COIL Door locked Door unlocked
Door
closed
Stays reset
Start request
For enable,
the
door
must be
completely
opened
(error
uncovered)
No start
of the
"Machine"
In case of the principle of interlock by magnetic force used
here, the safety door remains locked as long as voltage is applied
to the magnet in the safety position switch.
An alternative is the principle according to which the safety
door remains closed due to spring force. The voltage applied
to the magnet of the safety position switch must drop to zero
to keep the door interlocked. This principle is described in the
Safety Integrated Functional Example No. AS-FE-I-002-V10-
EN.