Calculating minimum distance
The calculation of the minimum distance is based on international or national stand‐
ards and statutory requirements applicable at the place of installation of the machine.
The minimum distance depends, among other things, on the following:
•
Machine stopping time (time interval between triggering the sensor function and
the end of the machine’s dangerous state, including signal propagation times in
the network and processing time in the control)
•
Response time of the protective device
•
Reach or approach speed of the person
•
Resolution (detection capability) of the device
•
Type of approach:parallel
•
Parameters specified based on the application
•
Supplements for general and, possibly, reflection-based measurement errors
•
Supplement to protect against reaching over
•
Height of the scan plane
•
Switching time between monitoring cases
8.9 Hazardous point protection
The device is mounted with a vertical scan plane in a stationary application, for exam‐
ple on a machine where the operator must stay close to the hazardous point.
There is a fixed barrier in front of the hazardous point. The required height is specific
to the particular application, and the applicable standards (for example ISO13857)
should be taken into consideration when calculating the height.
The operator can reach over the barrier and through the scan plane into the hazardous
point. But the operator cannot climb over the barrier. If there is no such barrier availa‐
ble, access protection may be required.
During hazardous point protection, the device detects the arm or another part of a
person’s body. The protective field is orthogonal to the direction of approach of the body
part. A resolution of 40mm is required to ensure detection of the arm during hazardous
point protection.
8 PROJECT PLANNING
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O P E R A T I N G I N S T R U C T I O N S | TiM361S 8022483/1LM2/2024-03-27 | SICK
Subject to change without notice
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