Folding Function; Access Protection - Siemens Simotion TM 121C Applications Manual

Procedural functions of press brakes
changes to the slow downward movement.
This function can be deactivated (default).
•
External safety device 1 (2)
This signal can be used to query 2 one-channel safety devices. A LOW level at
one of the inputs de-energizes the valves. This can be used, for example, to
implement a "Tilt monitor" (Chapter 7.6.2).

7.5 Folding function

Functions specific to die bending presses are parameterized in the "Folding
function" menu. These functions include:
•
Access protection (moving safety devices, distance protection)
•
Valve monitor (watchdog or dynamic)
•
Emergency off output signal
•
Valve control
7.5.1

Access protection

Figure 7-2
Two safety devices can be parameterized for access protection (light curtain or
laser safety device). Each access protection can be activated as required for the
mode. If the access protection is deactivated in a specific operating mode, it must
be switched off. Preferably this will be implemented via the ESPE supply (0.5 A
output). One dual-channel input is used per access protection. The fast downward
movement for foot operation is only possible when the access protection is active
(for exceptions, see Chapter 7.6.1). If access protection 1 and access protection 2
are active in a particular operating mode, they are ANDed. A falling edge on an
active access protection de-energizes the valves. The access protection is not
evaluated beyond the mute point (function required for light curtain).
7-54
Access protection
© Siemens AG 2003 All Rights Reserved
SIMOTION Safety Unit (AP) - Edition 06.2003