SICK S300

Chapter 5 Operating instructions
S300
72 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 8010948/YY96/2016-02-17
Subject to change without notice
Mounting
 If the timing for the switching cannot be exactly defined, e.g. due to the variable proces-
sing speed of the machine, or advancing the timing results in premature termination of
the monitoring of the initial area, you must allow the two protective fields to partially
overlap.
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
U
v
,
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 4.5.1 “Input delay” on page 38).
 whether you use external OSSDs via EFI.
 whether you use external control inputs (e.g. on another S300).
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.
43
:
Example of ad
-
vancing the timing for the
switching
Notes


 
t
Uv
t
U

t
