© Siemens AG 2003 All Rights Reserved
SIMOTION Safety Unit (AP) - Edition 06.2003
3-21
3 Safety components
The contacts can be wired directly in the control unit. Additional contactors or
relays are not required. The following cyclical monitoring procedures are performed
in the program:
• Short circuit monitor between the two mutually isolated signal circuits.
• Discrepancy check of whether both switch-off circuits carry out a signal
change when the button is activated. The change between the two signals is
also monitored over time. The only elements that do not adhere to the preset
discrepancy time are the safety gate components.
The following components are available and can be combined as required:
• EMERGENCY OFF with restart inhibit (4x)
• EMERGENCY OFF without acknowledge (4x)
• Engaging lock (without acknowledge) (2x)
• Safety guard with restart inhibit (4x)
• Safety guard without acknowledge (4x)
• Safety gate with manual acknowledge (3x)
• Safety gate without manual acknowledge (3x)
Light curtains that are only used in the safety mode can be connected to the
existing safety guard components. For a description of their mode of operation, see
the Operating Elements chapter.
The parameterization of light curtains that are switched in safety and clock mode is
presented in the Operating Elements chapter.
Comments
• The EMERGENCY OFF that is activated in the parameterization is always
active for the entire control unit. It can, however, be deactivated for individual
operating modes (e.g. useful when creating different EMERGENCY OFF
circuits).
• The same applies to the engaging lock and the safety gate and safety guard
components. In this case, the safety devices can be specifically deselected in
the operating modes in which they are to be inactive.
Note
Without the implementation of additional safety measures, safety gates and
safety guards without a restart inhibit are not suitable for hazardous areas that
can be walked through.
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