A trend that has been growing
in industrial automation is the use of PLCs and Safety type IOs, which are
usually identified by yellow or red color. The Safety Input cards are used
to receive signals, coming from an emergency button, a laser curtain or a
safety door for example, which are used in the PLC program to compute the logic
and communicate the resulting actions to other devices, either by hardware via
Safety Output cards or by network, with special protocols such as
PROFISAFE.
A practical example is the use
of E-Stops on a production line. When triggered, the goal is to safely
switch off an engine. To reactivate the system, just reset the emergency
button, press the global reset and then the button turns on. In this post
we will show this implementation in TIA Portal and simulate with PLCSIM.
Program configuration using
the existing blocks and libraries.
Testing with PLCSIM: Idle / Start / Stop / E-Stop Reset / Global reset
Safety Signatures, whether
Software or Hardware can be seen in the Safety Administration:
An example project can be
downloaded from the Siemens website.
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