Functional Safety – Supplementary manual for series SK 500P
22 BU 0630 en-2020
In this example, there is no reset circuit as is the case with the protective switching devices. If the
result of risk analysis shows that cancellation of the stop command must be acknowledged by a
deliberate manual action, the resetting requirements can be fulfilled organisationally (e.g. by an
emergency stop button with key release and storage of the key away from the machine).
If the Safe Pulse Block is triggered for an enabled frequency inverter, this results in the error E018
(18.0 “Safety circuit”).
With the Automatic Fault Acknowledgement (P506) and Automatic Starting (P428) functions (see BU
0600), the drive starts immediately after the emergency stop button is released. For this reason, it is
urgently recommended that these functions are not used in combination and especially not for safety-
relevant applications.
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2.4.4 Example without Safe Pulse Block
Hazardous movement
If the safety functions STO/SS1-t are exclusively implemented via the Safety Digital Input, the drive
can be unexpectedly supplied with power at any time, even after it has been stopped. Under some
circumstances this may cause hazardous movement. In this c
ase, the fault response action is
performed at the latest after the maximum fault response time (see technical data 35 ms).
• Implement the safety function with the Safe Pulse Block.
It is possible to implement the safety function STO or SS1 with the Safety Digital Input and a
protective switching device only. However, according to DIN EN ISO 13849-1, with this switching
variant, the maximum safety category that can be achieved is category 2. However, the condition for
this is that in addition to the digital input, all other components (protective switching device, emergency
stop button, wiring) also fulfil the requirements for category 2.
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