Pn Basic Terminal Box - Siemens SINUMERIK 840D sl Equipment Manual

7.2.3

PN Basic terminal box

In contrast to the PN Plus terminal box, the "Stop loop through" function is not implemented on
the PN Basic terminal box. Relays are so not required.
Figure 7-4
Note
The emergency stop circuit is controlled via the emergency stop button when the HT 8 is
connected. If the connecting cable of the HT 8 is disconnected from the PN Basic terminal box,
the emergency stop circuit is interrupted. This leads to a safe machine stop or an Emergency Stop
of the system to be monitored.
Switching states of the emergency stop circuit
HT 8
Connected
Connected
Not connected
Danger of death resulting from the premature emergency stop unlocking
If you have shut down the system to be monitored, you can only release the emergency stop
button or put the system to be monitored back into operation if the condition that triggered the
emergency stop function has been corrected and a safe restart is carried out.
Handheld Terminal HT 8
Equipment Manual, 02/2024, A5E52918633B AA
PN Basic terminal box
Emergency
Stop button
Not pressed
Pressed
WARNING
Switching status, emergency stop circuit
Emergency Stop circuit in the terminal box remains closed.
The emergency stop circuit in the terminal box is open.
The system to be monitored is stopped.
- The emergency stop circuit in the terminal box is open.
The system to be monitored is stopped.
Connecting
7.2 Terminal Box PN
103