profibus-dp各种报文的数据所表达的详细意义

PROFIBUS DP the fastest field bus system

class 1 master -

central controller which exchanges data with the

several class1 masters are permitted, typical devices are

diagnostic and startup tool, typically a configuration tool

master-master, master-

Reading Configuration

a device can consist of multiple functions, e.g.... class1 and class2, class1 and slave

A device can consist of multiple functions, e.g... class1

and class2, class1 and slave, which allows:

a simple master master communication via the master -

whenever one master has the token the other PLC can be a

PLC

Master -Master communication by using a DP-DP gateway combination of two mono master systems

simple data exchange between the two masters up to 244

PLC

Open Configuration permits Plug and Play

GSD file

each slave or master class 1 device on PROFIBUS DP needs to have a device description file, the characteristic of each PROFIBUS-DP device is described in the GSD-File

the GSD-file contains all device specific parameters e.g.:

GSD-Files are created by the device vendors

the PROFIBUS Trade Organization provides an GSD-Editor the GSD-Editor contains a GSD-Checker which guarantees a library of GSD-Files is provided at the PROFIBUS web

#P r o fib u s_D P

:

P r m T e x t=

……..

E n d M o d u le ext. user parameter data (O) mandatory general data (M) generic slave data (M)

#Profibus_DP

device name (which will be displayed in the

- unique Identification number, each slave

and master class 1 device needs to have

Protocol_Ident=0defines supported protocols, 0- DP, 1- DP/FMS

all supported baudrates, between 9.6kBaud

max. answering time related to the baudrate

Freeze_Mode_supp=1

The application interface needs to offer a capability for the

Master Phys. Outputs

?t

?t

synchronized

?t

Master Phys. Outputs

?t

?t

synchronized

?t

Auto_Baud_supp=1device is able to detect the baudrate

station address can be set via the PROFIBUS

s e.g 100 x 10 = 1ms

Slave_Family=0

defines a expandable or a fixed station,

defines the max. length of Output data

Fail_Safe=1

indicates the behavior of the slave in case of a failure

atchdog expired, …)

for outputs, in case of a fail

safe device the device is either keeping the last value

Slave state machine

Power_ON/

Character Format

Character/Message attributes

1 character consists of 11 bits