Chapter
11
Operating Instructions
UE 440/470
86
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
8 010 432/P097/14-03-05
Technical data
11
Technical data
11.1
Response times of OSSDs A and B
The response time of the UE 440/470 is not to be set the same as the overall response
time of the safety application. When considering the response time, you must calculate the
response times for the individual signal paths (e.g. from input of a input device or sensor
or from an EFI connection to the OSSDs).
Take the response times into account when planning the safety distance!
The OSSDs of the UE 440/470 are subject to a response time due to the initial conditions
and the internal logic. Increase the safety distance/protective field size of the connected
ESPE accordingly.
The listed response times do not take into consideration a case where a fault occurs
during response. (This can lead to an increase of the response time.)
To set the total response time of the protective device, you must also take into
consideration the response time of the sensors, the dropout time of following contactors
and their spark supression and the stop time of the machine.
The response time of your application depends on...
$
the processing time of the safety controller.
$
the response times of the devices connected to the safety controller.
$
a configured input delay for the inputs of the UE 440/470 if the connected input devices
and sensors affect the OSSDs.
Example:
A safety switch secures the entry to a robot cell, and opening of the door
switches one of the OSSDs off. A configured input delay increases the response time of
the OSSD.
$
the transfer time of OSSD status information via EFI if it is only transferred via the EFI
connection to the safety controller and affects one of the OSSDs (see Chapter 6.3.1
"Electro-sensitive protective equipment" on Page 6).
$
a configured shutdown delay for output
Out2
of a function module if it affects one of the
OSSDs (see Section 4.2.10 "Shutdown delay of output Out2" on Page 6).
Stated simply:
Response time = 10 ms + t
DI
+ t
DO
Where ...
t
DI
=delay time at the inputs
t
DO
=shutdown delay at the outputs
Using the following calculation scheme, you determine the response time on a signal path
up to the OSSDs of the safety controller.
$
Calculate the response times of the OSSDs for each switch-off condition within your
safety application. Then use the calculated response times to define the safety distance.
$
If you have configured several operating modes, it is imperative that you calculate the
response times of the OSSDs for each operating mode in your safety application. Then
use the greatest calculated response time to define the safety distance.
%
ATTENTION
Notes