Siemens SPC3 Specifications download pdf (Page 13)

Introduction To ProfiBus DP

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Acromag, Inc. Tel:248-624-1541 Fax:248-624-9234 Email:sales@acromag.com http://www.acromag.com

Slave_Family = 3

Min_Slave_Interval = 1 ; Min_Slave_Interval is 100us

Modular_Station = 0 ; 0-compact, 1-modular

Max_Diag_Data_Len = 6 ; No User Diagnostics are Sent

; I/O Byte

Module = “12 CH DIG I/O:xxxx1198 76543210” 0x11,0x21

EndModule

;

Leading PLC manufacturers offer configuration software for their

products that make it easy to generate the master parameter record for their

devices. This software is generally master-specific and depends on the

design of the master device. In order to setup a ProfiBus system, you will

need a software configuration tool, such as Allen Bradley’s Plug and Play

software, or the Siemens COM ProfiBus package. This software configures

the active stations and tells them what devices are present on the bus and

how much data it needs to exchange with them.

Recall that the master parameter record contains all the required data

for the bus system, including an address allocation list and the bus

parameters of the connected slaves. The address allocation list assigns

each remote I/O byte a unique address in the I/O space of the master’s I/O

space.

As an alternative method to PLC specific software, Siemens offers an

easy to use configuration tool called COM PROFIBUS that can be run on

any PC (offline version). An online version of COM PROFIBUS requires an

interface card.

The configuration software utilizes the GSD files (device master data) of

the connected slaves to create the master parameter record. This record is

typically transferred or downloaded to the class 1 master from floppy disk,

dual port RAM, or Flash EPROM. Typically, if you need to add another slave

to an existing system, you simply upload the current master parameter

record, add the new parameterization data for the slave (imported from the

GSD file), then download the new master record to the master again. Since

an active bus station automatically detects a new active bus station, you can

then perform a reset, and the bus system will reconfigure itself.

In addition to the slave-specific data which the configuration tool

gathers from the GSD file, you may also have to provide the following bus

and protocol-related data via the configuration tool:

•

The Protocol Used (DP, FMS, or mixed network).

•

The transmission baud rate (the tool checks to determine whether

all stations or slaves actually support this speed).

•

The GAP factor (number of bus passes after which an additional

active station is searched for). A master automatically detects the

connection of other masters via a periodic search driven by this

factor.

•

The Highest Station Address (HSA).

•

The Watchdog Time.

•

Within a PLC, the CPU type and type of addressing used.

REQUIRED SOFTWARE

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Siemens SPC3 Specifications Page 13

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