Siemens SINUMERIK 840D sl Manual page 31

Optional customer buttons IN (X51 / X52 / X55)
Only switches (passive inputs) may be connected via the X51, X52 and X55 connectors. X51
and X52 are typically used for connecting illuminated pushbuttons. The lamps in the buttons
are activated via X53 and X54. X55 has no corresponding outputs.
Note
Connection miniature handheld unit
Alternatively, at the inputs X51, X52 and X55, one miniature handheld unit may be operated.
For details, please refer to the corresponding section.
Figure 1-5
Connector designation:
Connector type:
Max. cable length:
Table 1-17
Pin
1
2
3
4
Operator panel front: OP 012
Manual, 09/2016, A5E36371591B
Main circuit diagram of the input circuit for X51, X52 and X55
X51 / X52 / X55
4-pin plug connector
0.6 m
Assignment of connector X51
Name
KT-IN1
KT-IN2
KT-IN3
M
General information and networking
Type Meaning
Customer key 1
I
Customer key 2
Customer key 3
V Ground
1.3 Connecting
31