Procedural functions of press brakes
© Siemens AG 2003 All Rights Reserved
7-56
SIMOTION Safety Unit (AP) - Edition 06.2003
7.5.3
Dynamic valve monitoring
Figure 7-4 Dynamic valve monitoring
Three valves can be monitored dynamically.
Switching is monitored every time the corresponding valve is activated.
The feedback input can be defined as an NO or NC contact.
To be able to control the valve, the read back input must be at LOW level
before
the valve is activated.
During switching, at least one leading edge must be received at the read back input
(for NO contact.
Note
The valve can be activated on short start pulses from the command devices, but
it does not switch through due to valve run times. Since in this case there would
also be no feedback at the read back input, this would result in a valve switching
fault. For this reason, a response delay can be parameterized for the valve. The
response delay for the valve monitor can be variably set to between 20 and
2000 ms.
Содержание Simotion TM 121C
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