ProSoft Technology PS69-DPM - Manual (Page 106)

Contents PS69-DPM ♦ CompactLogix or MicroLogix Platform
User Manual PROFIBUS DPV1 Master
Page 106 of 130 ProSoft Technology, Inc.
October 1, 2014
6.1.2 PROFIBUS Interface
Isolated RS-485 interface per EN 50170.
3 RxD/TxD-P Receive/Send Data-P respectively connection B plug
5 DGND Reference potential
6 VP Positive power supply
8 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.
6.1.3 Functional Specifications
Specification Description
Slaves max. 125
Input/Output max. 244 Bytes per Slave
Input Data max. 408 Bytes (*)
Acyclic Data DPV1
Status data 88 Bytes
Output data max. 480 Bytes (*)
Command data 16 Bytes
DPV1 services Read / Write class 1, Alarm
Services Global-Control, Slave-Diag, Set-Parameter
Sync, Freeze Command supported
Up to 32 PROFIBUS devices can be connected to one bus segment. If several bus
segments are linked to each other with repeaters, there can be up to 127 devices on the
network.