8Bus Parameters for PROFIBUS TM System Bus on ASx88/TM and WinCC

Parameter description

DOS_CONF.DAT

in AS488 and

Bridge

L2AMPRO.INI

 

Configura-

in

 

tion dialog in

ASx88

 

Windows NT

 

 

for WinCC

 

 

 

Value

Highest station address

Local device address

Baud rates (index)

Slot time

Quiet time

Setup time

Minimum station delay time

Maximum station delay time

Token rotation time

GAP factor

Call repetitions

Ready time

Idle time 1

Idle time 2

l2_hsa

l2_ts

l2_baud_rate

l2_tsl

l2_tqui

l2_tset

l2_max_tsdr

l2_min_tsdr

l2_ttr

l2_g

l2_retry_ctr

-

-

-

l2_hsa

l2_ts

l2_baud_rate

l2_tsl

l2_tqui

l2_tset

l2_max_tsdr

l2_min_tsdr

l2_ttr

l2_g

-

-

-

-

Highest Sta- tion Address

Local Station Address

Transmission Rate

Tslot

Tqui

Tset

Max Tsdr

Min Tsdr

Ttr

Gap factor

Retry Limit

Trdy

Tid1

Tid2

 

1 ....

126

 

 

 

....1

99

 

 

 

1,5 Mbits/s

3000

0

240

980

150

min.

90000 *)

30**)

The PROFIBUS bus parameters for WinCC are specified in the user-defined profile. But for the Ttr parame- ter, the values of the general-purpose profile will be transferred to the user-defined profile if the general- purpose profile is selected beforehand. In this case, these values are almost identical to the above- mentioned ones.

*) Use the following formula to calculate the Ttr parameter, and enter it: Ttr (l2_ttr) = 9000 * [number of active PROFIBUS-TM devices].

Note: The factor 9000 in the formula is only valid for a baud rate of 1.5 Mbits/s.

**) For the baud rate of 1.5 Mbits/s, the default value of the gap factor is 30 – 50. Entering a smaller value may be necessary in exceptional cases.

All specified bus parameters are tuned to the baud rate of 1.5 Mbits/s. Any change/optimization requires a deep knowledge of the PROFIBUS standard.

The bus parameters for all TELEPERM components (e.g. OS525 and PROGRAF AS) on the PROFIBUS TM system bus must be selected accordingly.

Product Information

PCS7/TM V2.02

24.10.2001

© Siemens AG 2001

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Siemens PCS7, TM manual Parameter description, AS488 Bridge, Configura, Tion dialog, ASx88 Windows NT For WinCC Value

PCS7, TM specifications

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