The diagnostics for the contacts of S11 is performed on the HT 8 together with the diagnostics
of the emergency stop button.
Note
Make sure that the emergency stop override is implemented with the S11 button in accordance
with the safety goals required by the risk analysis of the machine. Actuation of the emergency
stop override results in failure of the emergency stop safety function on the HT 8. To this end, you
must implement suitable organizational and/or technical procedures to achieve the safety goals.
As a technical measure, the signaling contacts on the S11 emergency stop override: 31/32 and
61/62 can be used to trigger an "emergency stop" by the PLC after a monitoring time has expired
(maximum ve minutes) (see Remark 1 in the following gure). However, this measure alone
does not satisfy the requirements of Category 3, PL d according to EN ISO 13849-1:2008.
If the risk analysis of your machine has shown that the technical measure for monitoring the
emergency stop override (S11) is not sucient, the signaling contacts 31/32 and 61/62 of S11
can be evaluated, e.g. by a safe PLC or the SPL of the SINUMERIK 840D sl. The requirements of
category 3, PL d according to EN ISO 13849-1:2008 can be met with this measure.
Wire these contacts accordingly.
All other functions can be found in the following gure:
Connecting
6.5 Emergency stop override S11
Machine Pushbutton Panel: MPP 464 IE H
56 Equipment Manual, 03/2021, A5E50810237B AA
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