Prosoft-technology PS69-DPS User Manual download pdf (Page 65)

PS69-DPS ♦ CompactLogix or MicroLogix Platform Reference

Profibus DP Slave Communication Module User Manual

ProSoft Technology, Inc. Page 65 of 108

May 9, 2014

5.1.4 PROFIBUS Interface

Isolated RS-485 interface per EN 50170.

RxD/TxD-P

Receive/Send Data-P respectively connection B plug

DGND

Reference potential

Positive power supply

RxD/TxD-N

Receive/Send Data-N respectively connection A plug

Please ensure that termination resistors are available at both ends of the cable. If

special PROFIBUS connectors are being used, these resistors are often found

inside the connector and must be switched on. For baud rates above 1.5 MBaud

use only PROFIBUS connectors, which also include additional inductance. It is

not permitted to have T stubs at high baud rates.

Use only a special cable which is approved for PROFIBUS-DP. Make a solid

connection from the cable shield to ground at every device and make sure that

there is no potential difference between the grounds at the devices.

If the PS69 is linked with only one other device on the bus, both devices must be

at the ends of the bus line. The reason is that these devices must deliver the

power supply for the termination resistors. Otherwise the Master can be

connected at any desired position.

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Prosoft-technology PS69-DPS User Manual Page 65