Siemens SINUMERIK 840D sl Function Manual page 622

Measurement (M5)
Hardware requirements
I/O device interface X121
The interface connection for a probe is made via the
● I/O device interface
37-pin D-sub plug connector (X121), a maximum of 2 probes can be connected;
The 24 V load power supply is also connected by means of this connector.
Table 8- 3
X121
The interfaces with pin assignment are displayed and described in detail:
References:
/PHC/ CCU Configuration Manual
PROFIBUS-DP drives
It is possible to operate a distributed probe directly on the PROFIBUS-DP drive for the
SINUMERK 840D with an NCU 573.2/3/4. This method is more accurate than NC
interpolation of cyclic position values from a centralized probe.
The type of measuring function for PROFIBUS-DP drives, e.g. with SIMODRIVE 611
universal, is specified by the following machine data:
MD13210 $MN_MEAS_TYPE
Value = 0: A probe connected centrally to the NC or
Value = 1: A distributed probe wired for all drives.
622
Extract from PIN assignment table for X121 front connectors
PIN
1 M24EXT
2 M24EXT
... ...
9 MEPUS 0
10 MEPUC 0
... ...
20 P24EXT
21 P24EXT
... ...
28 MEPUS 1
29 MEPUC 1
... ...
Name
External power supply
External ground
External ground
...
Probe connection 1
Measuring pulse signal input
Measuring pulse common input
...
External power supply
P 24 V external
P 24 V external
...
Probe connection 2
Measuring pulse signal input
Measuring pulse common input
...
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions