Siemens Computer Hardware TM Uživatelský manuál stáhnout pdf (Strana 17)

Product Information PCS7/TM V2.02 24.10.2001

 Siemens AG 2001 17 of 21

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

and WinCC

Parameter

description

DOS_CONF.DAT

in AS488 and

Bridge

L2AMPRO.INI

ASx88

Configura-

tion dialog in

Windows NT

for WinCC

Value

Highest station address

l2_hsa

Highest Sta-

tion Address

1 .... 126

Local device address

l2_ts

Local Station

Address

1 .... 99

Baud rates (index)

l2_baud_rate

Transmission

Rate

1,5 Mbits/s

Slot time

l2_tsl

Tslot

3000

Quiet time

l2_tqui

Tqui

Setup time

l2_tset

Tset

240

Minimum station delay

time

l2_max_tsdr

Max Tsdr

980

Maximum station delay

time

l2_min_tsdr

Min Tsdr

150

Token rotation time

l2_ttr

Ttr

min.

90000 *)

GAP factor

l2_g

Gap factor

30 **)

Call repetitions

l2_retry_ctr

Retry Limit

Ready time

Trdy

150

Idle time 1

Tid1

515

Idle time 2

Tid2

980

• 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.

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