Safety systems - General information
4.3 Basic terminology
3SK1 safety relays
34 Manual, 04/2013, A5E02526190021A/RS-AA/01
4.3.7 Automatic start
For an automatic start, the device is started without manual confirmation, but only after the
input image has been checked and a positive test of the safety relay has been conducted.
This function is also known as dynamic operation and is not permissible for EMERGENCY
STOP devices. Safety devices for prohibited danger zones (e.g. position switches, light
arrays, safety shutdown mats) can use the automatic start function if this does not pose any
risk.
Note
An automatic start is not permitted for EMERGENCY STOP devices.
4.3.8 Manual start
For a manual start, the device is started by operating the START button, but only after the
input image has been checked and a positive test of the safety relay has been conducted.
On a manual start, the START button is not monitored for correct operation, a positive edge
of the START button is sufficient for starting.
Note
The "Manual start" function is only available with the 3SK1111 safety relays (slide switch at
Autostart position).
Note
Manual start is not permitted for EMERGENCY STOP devices.
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Figure 4-3 Start function "Manual start"
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