Siemens CM 1243-5 - D-sub socket pinout

Installing, connecting up and commissioning
3.4 Pinout of the D-sub socket
CM 1243-5
Operating Instructions, 04/2011, C79000-G8976-C246-01
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Table 3- 3 Pin assignment of the socket for the external power supply
Pin Labeling Function
1 L+ + 24 VDC
2 M Ground reference for + 24 VDC
3 Ground connector
3.4 Pinout of the D-sub socket
PROFIBUS interface
Table 3- 4 Pinout of the D-sub socket
Pin Description Pin Description
1 - not used - 6 VP: Power supply +5 V only for bus
terminating resistors;
not for supplying external devices
2 - not used - 7 - not used -
3 RxD/TxD-P: Data line B 8 RxD/TxD-N: Data line A
4 CNTR-P: RTS 9 - not used -
5 DGND: Ground for data signals
and VP
Housing Ground connector
PROFIBUS cable and connector
CAUTION
Contacting the shield of the PROFIBUS cable
The shield of the PROFIBUS cable must be contacted.
To do this, strip the insulation from the end of the PROFIBUS cable and connect the shield
to functional earth.
NOTICE
If you use a 180° PROFIBUS or a PG connector, the lower panel cannot be completely
closed.