Siemens SINUMERIK 840D sl Equipment Manual page 107

Note
Use this terminal for simple routing of the emergency stop cables, optional.
The connector is only used to assist looping through. The connected pins 1 and 2 as well as 3 and
4 have no additional function on the connection module.
X20: Enabling buttons
Connector designa‐
tion:
Connector type:
Table 7-3
X21: Emergency Stop and key-operated switch
Connector designa‐
tion:
Connector type:
Table 7-4
Handheld Terminal HT 8
Equipment Manual, 02/2024, A5E52918633B AA
Pin
3
4
X20
8-pin Phoenix terminal
Assignment of the interface enabling buttons X20
Pin Signal name
1 ZUST1P
2 ZUST1M
3 ZUST2P
4 ZUST2M
5 N.C.
6 N.C.
7 N.C.
8 N.C.
X21
10-pin Phoenix terminal
Assignment of the interface Emergency Stop and Module Supply Voltage
Pin Signal name
1 STOP23
2 STOP24
3 STOP13
4 STOP14
5 M
6 N.C.
Protective circuit
On-board jumper
between 3 and 4
Signal type
I Electronic enabling button 1 P
O Electronic enabling button 1 M
I Electronic enabling button 2 P
O Electronic enabling button 2 M
-
-
-
-
Signal type
B
P
-
Connecting
7.3 PN Basic connection module
Meaning
Not connected
Not connected
Not connected
Not connected
Meaning
Emergency Stop circuit
Emergency Stop circuit
Emergency Stop circuit
Emergency Stop circuit
Ground
-
107