Siemens SINUMERIK 804D sl Equipment Manual

7.2.2 PN Plus terminal box
The PN Plus terminal box di󹪜ers from a PN Basic terminal box in that it has four relays mounted
on the board.

① Board
② Relays
Figure7-3 Inner view of the PN Plus terminal box
Switching states of the emergency stop circuit
HT 8 Emergency
Stop button
Switching status, emergency stop circuit
Connected Not pressed Emergency Stop circuit in the terminal box remains closed.
Connected Pressed The emergency stop circuit in the terminal box is open.
The system to be monitored is stopped.
Not connected - Emergency Stop circuit in the terminal box remains closed.
WARNING
Danger of death resulting from the inadvertent disconnection of the HT 8
If you disconnect the HT 8 from the PN Plus terminal box, the emergency stop circuit is closed,
thereby clearing the stop state of the system to be monitored. This occurs irrespective of
whether the emergency stop button has been pressed on the HT 8.
Connecting
7.2Terminal Box PN
Handheld Terminal HT 8
102 Equipment Manual, 02/2024, A5E52918633B AA

Siemens SINUMERIK 804D sl Specifications

General

Brand	Siemens
Model	SINUMERIK 804D sl
Category	Control Systems
Language	English