Siemens SIMATIC HMI Mobile Panel 277 RO - STOP Button on the Connection Box Plus

Operator controls and displays
5.1 Operator controls and displays on the Mobile Panel 277 RO
Mobile Panel 277 RO
66 Operating Instructions, 10/2015, A5E36824256-AA
5.1.3.3
STOP button on the connection box Plus
Overview
The "Stop loop" function is implemented on the connection box PN Plus. The double-circuit
loop is provided by four relays mounted on the printed-circuit board.
①
Board
②
Relays
Switching states of the Stop or Emergency Stop circuit with connection box Plus
Switching states of the Stop or Emergency Stop circuit for a connected Mobile Panel 277 RO
with STOP button and connection box PN Plus:
Mobile Panel 277 RO
STOP button
Status of the Stop or Emergency Stop circuit
Is connected
Not pressed
The Stop or Emergency Stop circuit remains closed.
Is connected Pressed The Stop or Emergency Stop circuit is open.
The system being monitored is shut down.
Is not connected
–
The Stop or Emergency Stop circuit remains closed.
WARNING
Disconnecting the Mobile Panel 277 RO
If you disconnect the Mobile Panel 277 RO from the connection box PN Plus, the Stop or
Emergency Stop circuit is closed and the Stop status of the system being monitored is
nullified. This is independent of whether or not the STOP button was pressed on the
Mobile Panel 277 RO.
Note
Approximately 100 ms elapse between the time the STOP button is pressed and response of
the Stop contacts at the connection box Plu
s.