Terminal Box Pn; Description - Siemens SINUMERIK 840D sl Equipment Manual

The system keys (machine control panel functionality / override) are transferred to a
SINUMERIK PLC as well as also to a SIMATIC CPU in a DB interface.
The safety signals for emergency stop and enabling are retrieved from the connection box,
the connection module or MPP via the connecting cable and connected to the safety relays in
the control cabinet.
If no HT 2 is connected, observe the following:
NOTICE
Unauthorized access
• After disconnection, the HT 2 must be locked away.
• Emergency stop buttons that are inactive must not be identified as such or must be
: compatible from FS 10
1
4.3.2

Terminal Box PN

4.3.2.1

Description

①
②
③
④
⑤
Figure 4-7
Handheld units
Equipment Manual, 04/2024, A5E53284668B AB
inaccessible. This is to prevent the emergency stop button from being used inadvertently.
LED displays
Screwed joint for power supply cable and shield
Screwed joint for cable with supplementary stop and agreement button signals and for PLC-ac‐
companying signals
Connecting socket for the connector plug of the connecting cable (covered with dummy cap)
Screwed joint for process data line (Ethernet)
Terminal Box PN
Handheld Terminal HT 2
4.3 Connecting
39