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System Connections
10
System Connections
10.1
Requirements of the user program
The automation system PSS 4000 from Pilz is required to run PSENvip. In the PSS 4000
user program the following safety functions must be implemented 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 pro-
– Press stop when switching off of the outputs Mute 1/2 of PSENvip does not corres-
– 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 reduced protected field can at any time stop the
movements of the upper tool in time. This is only possible when the press speed is re-
duced 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 monit-
oring the pinch point and the press brake ramp.
For the safety functions described Pilz offers a certified evaluation program for the PSS
4000.
In chapter 4.7 "System cycle" the signal behaviour of the outputs OSSD and Mute are de-
scribed in detail.
10.2
Communication with the safety system
For communication between PSENvip and the programmable safety system, please note
the following information in this operating manual:
}
Information on the inputs and outputs used for communication and information on the
communication sequence: Section entitled "Communication with the programmable
safety system", under "Function Description"
}
Safety guidelines on tool shapes, under "Safety"
}
Information on tool detection, in the section entitled "Adjustment during tool change", un-
der "Commissioning"
The user program in the programmable safety system must support communication with
the PSENvip, if tools of tool class 2 or 3 are used. The user program does not need to sup-
port this communication if tools of tool class 1 are used exclusively.
Operating Manual PSENvip RL D P Set
1001641-EN-09
cess data of CNC (pinch point) The pinch point must be safety-related in the user pro-
gram to do this.
pond to the expectation. This is the case, for example, when an obstacle (e.g. a hand)
rests on the plate and the outputs Mute 1/2 are switched off earlier than expected.
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