Pilz PSENvip RL D P - Manual (Page 123)

Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: +49 711 3409-0, Telefax: +49 711 3409-133, E-Mail: [email protected]
10-1
10.1 Requirements of the user program
10 System Connections
10 10000 System Connections System Connections 10- 10.1 Requirements of the user program 10100 Requirements of the user program 10- Systemanbindung_PSS4000
The automation system PSS 4000 from Pilz is required to run PSENvip.
In the PSS 4000 user program the following safety functions must be im-
plemented to safeguard the dynamic muting of PSENvip:
 Monitoring of the pinch point
– Calculating an expectation for switching off the outputs Mute 1/2,
based on the process data of CNC (pinch point) The pinch point
must be safety-related in the user program to do this.
– Press stop when switching off of the outputs Mute 1/2 of PSENvip
does not correspond to the expectation. This is the case, for exam-
ple, when an obstacle (e.g. a hand) rests on the plate and the out-
puts Mute 1/2 are switched off earlier than expected.
– The monitoring of the pinch point must be performed in each press
stroke.
 Monitoring of the braking ramp
PSENvip reduces its protected field during dynamic muting. The
monitoring of the press brake ramp must ensure that also the re-
duced protected field can at any time stop the movements of the up-
per tool in time. This is only possible when the press speed is
reduced accordingly.
If for example the brake ramp is launched too late, the PSS 4000
stops the press.
 Determining of a safe position and a safe speed of the upper tool
Safe evaluation of the encoders (e.g. incremental encoders) is the
prerequisite for monitoring the pinch point and the press brake ramp.
For the safety functions described Pilz offers a certified evaluation pro-
gram for the PSS 4000.
In chapter 4.7 "System cycle" the signal behaviour of the outputs OSSD
and Mute are described in detail.