
6-31
Cabling and Wiring the System
SIMATIC 545/555/575 System Manual
Figure 6-21 shows the pinout for the PROFIBUS-DP port for the products
(e.g., CPUs, RBCs) that are described in this manual.
NOTE: Pins 2 and 7 are “No Connect” for the products described in this
manual. For some PROFIBUS products, these pins are used to provide
24 VDC for powering a programming or configuration tool. Such tools are
not powered by the products described in this manual. It is acceptable for an
externally-powered PROFIBUS programming or configuration tool to drive
pins 2 and 7 to 24 VDC.
1
2
*3
NO CONNECT
TX/RX+
4
5
6
RTS
7 NO CONNECT
*8 TX/RX–
9
Pin Signal
Female 9-Pin D-Connector
* For Pin 3: Terminal B on Siemens connector.
* For Pin 8: Terminal A on Siemens connector.
BIAS SUPPLY GND (5)
TX/RX+ (3)
TX/RX– (8)
6
1
9
5
BIAS SUPPLY GND
CHASSIS GND or NC
BIAS SUPPLY +5V
BIAS SUPPLY GND
(D-shell)
CHASSIS GND
Figure 6-21 PROFIBUS-DP I/O Port Pinouts
CAUTION
Pin 5 (BIAS SUPPLY GND) and Pin 6 (BIAS SUPPLY +5V) on the PROFIBUS-DP
connector are designed to support the PROFIBUS-DP I/O channel only. These
pins have a limited output power capability of approximately 0.45 W, which
greatly exceeds the typical PROFIBUS-DP load; however, overloading these
pins may cause internal component damage.
If the pins are overloaded, the PROFIBUS-DP port can be rendered
non-functional, requiring the unit to be returned to the factory for repair.
Do not overload the pins on the PROFIBUS-DP connector.
PROFIBUS-DP Port
Pinout
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