PROFIBUS Manual

FDL parameters

FDL parameters

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FDL parameters

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This table summarizes the main FDL parameters that can be read and written with management services.

 

Times are consistently given with the transmission period of one bit in tBit. Protocol-dependent parameters are therefore independent of the bit rate.

 

Name

M

S

Meaning

Range

TS

x

x

FDL address of target station

0 – 126

Baud rate

x

x

Bit rate setting

9,6; 19,2; 31,25; 45,45; 93,75; 187,5; 500; 1500, 3000; 6000; 12000 kbit/s

Medium_red

x

x

Does this station have a redundant bus connection?

single; redundant

HW Release

x

x

HW version number

0 to 32 readable characters

SW Release

x

x

SW version number

0 to 32 readable characters

TSL

x

x

Time-slot, i.e. the in period during which the initiator - a master - awaits an answer from the responder

52 to 216-1 tBit

min TSDR

x

x

Minimum response time

20 to 216-1 tBit

max TSDR

x

 

Maximum response time (maximum value of all stations in network)

20 to 216-1 tBit

TQUI

x

 

How long it takes after transmission of a signal until the quiescent level prevails again.

0  to 28-1  tBit

TSET

x

 

How long the transmitting direction has to be switched on before one can begin with the data.

20 to 28-1  tBit

TTR

x

 

Planned token circulation time

20 to 224-1 tBit

G

x

 

GAP update factor

1 to 100

in_ring_desired

x

 

Here the master indicates whether it wants the token or not.

true;  false

HSA

x

 

Highest projected station address. The GAP update is only performed up to this address.

2 to 126

max_retry_limit

x

 

Number of telegram retries if no answer is received.

1 to 8

Frame_sent_count

opt.

 

Number of telegrams sent.

0 to 232-1

Retry_count

opt.

 

Number of telegram retries.

0 to 216-1

SD_count

opt.

opt.

How many start delimiters have been received correctly?

0 to 232-1

SD_error_count

opt.

opt.

How many start delimiters have been received incorrectly?

0 to 216-1

TRR

x

 

Token Real Rotation Time

20 to 224-1 tBit

LAS

x

 

List of active masters on bus

Array of addresses

GAPL

x

 

List of all stations on bus

Array of 127 addresses with FDL status

M = mandatory service for a master

S = mandatory service for a  slave