Profibus



Profisafe Network .pdf (331Kb)

Profibus General Notesl

The basic principles to take into account...

a) The data rate of the Profibus segment must be defined according to the slowest equipment, which very often is the radio modem. So, if you are willing to use wireless communication and cables in the same site, you should have a dedicated segment for radios.

b) If the device is a touch panel or some other kind of control panel, there may occur some lack of communication capacity.

c) The interfacing can be done either by using the CRS-PB (YC0501) cable or by using the NARS-2 interface adapter, depending on the most practical approach for connecting the cables to the PLC.


1. Master-to-Slave,  or Master-to-MultiSlaves


1a) Radio modem parameters


Model =

SATELLINE-3AS-NMS


Channel spacing = 25 kHz


Com port 2 = RS-485, 9600-8-E-1


FEC = OFF


Firmware = 4.0.13


Other parameters as defaults.


Identical settings for all the modems in a system.


1b) Profibus parameters


HSA = equal to the real highest station address in the system


Data speed = 9600 bps


Tslot_Init = 1000
Max. Tsdr = 980
Min. Tsdr = 36
Tset = 1
Tqui = 0
Gap factor = 50
Retry Limit = 5


Ttr = 46001


Watchdog = 87837


2. Master-to-Repeater-to-Slave,  or Master-to-Repeater-to-MultiSlaves


2a) Radio modem parameters


Model = SATELLINE-3AS-NMS


Channel spacing = 25 kHz


Com port 2 = RS-485, 9600-8-E-1


FEC = OFF


Firmware = 4.0.13


Radio modem addresses (examples):


Master


Tx addresses = 0001/0001


Rx addresses = 0004/0004


Repeater


Tx addresses = 0004/0002


Rx addresses = 0003/0001


Slave or Slaves


Tx addresses = 0003/0003


Rx addresses = 0002/0002


Other parameters as defaults.


2b) Profibus parameters


Tslot_Init = 2000
Max. Tsdr = 980
Min. Tsdr = 36
Tset = 255
Tqui = 20
Gap factor = 50
Retry Limit = 5


Ttr = 62612


Watchdog = 119508

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