Procedural functions of press brakes
© Siemens AG 2003 All Rights Reserved
7-60
SIMOTION Safety Unit (AP) - Edition 06.2003
7.6.3 "Moving"
and
"distance" access protection
In the following figure, two safety devices can be parameterized for access
protection for an operating mode. If both are parameterized in the same operating
mode, the enable is ANDed. A falling edge at one of the safety devices always
brings about a stop. To enable the fast downward movement, the safety devices
parameterized in the respective operating mode must provide a HIGH level signal.
Application example:
Activation of distance protection (zone protection) from the MUTE point onward.
Figure 7-10 Distance protection
In this example, the downward movement was started in mode 2 (e. g. foot).
The "DOWN" request signal of the higher level control is reset at the MUTE point
(or any point). This brings about a machine stop. The system can then switch to
operating mode 3. Access protection 2 is now active. In this case, a MUTE point
cannot be parameterized in operating mode 3 since access protection would
otherwise be deactivated beginning with the MUTE point.
