SICK S3000

Operating instructions Chapter 5
S3000
8009942/WK81/2012-11-28 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 87
Subject to change without notice
Mounting
 If the timing for the switching cannot be exactly defined, e.g. due to the variable
p
rocessing speed of the machine, or advancing the switch timing results in premature
termination of the monitoring of the initial area, you must …
–
allow the two protective fields to partially overlap.
– have both hazardous areas monitored temporarily using simultaneous monitoring.
The following figure shows an example for a gantry robot that is protected using two
monitoring cases.
The gantry robot  moves to the right . On the left hand side the dangerous movement
is monitored by a monitoring case . When the gantry robot arrives at the point t
Uv
,
switching must have already been performed due to the advancing of the switching
necessary so that at time t
U
the right monitoring case  is active.
 For the movement to the left, that is for the switching to the monitoring case , the
same applies.
 The protective fields for the monitoring cases must overlap here , so that a protective
function is always provided.
How far you must advance the timing for the switching depends on …
 the input delay required for the used switching method to provide the input condition for
case switching (see section “Input delay” on page 44).
 whether you use external OSSDs via EFI.
 whether you use external control inputs (e.g. on another S3000).
How to calculate the timing for the switching:
 Calculate the timing for the switching using the following formula:
t
UFVz
=t
EVz
+ t
exOVz
+ t
StVz
Where …
t
UFVz
= Timing advance for the switching
t
EVz
= Input delay for the control inputs
t
exOVz
= Delay due to external OSSDs over EFI = 20 ms
t
StVz
= Delay due to external control inputs over EFI (0.5 × basic response time of the
slowest system in the EFI system)
Fig.
48
:
Example of
advancing the timing for the
switching
Notes



t
Uv
t
U

t
