Siemens SPC3 Specifications download pdf (Page 17)

Introduction To ProfiBus DP

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Format Value Data Field Length

SD1 10H 0 bytes (No Data Field)

SD2 68H 1 to 32 bytes (or up to 244)

SD3 A2H 8 bytes fixed.

SD4 DCH 0 bytes (No Data Field)

SC E5H 0 bytes (No Data Field), Short Acknowledge.

Start Delimiter SD1 (SD=10H)

Request_FDL_Status

Telegram with fixed information section and no data field…

SD1

DA SA FC FCS ED

10H xx Xx x x 16H

An active station sends this telegram to look for new active stations on

the bus after the GAP time has expired.

Start Delimiter SD2 (SD=68H)

Telegram w/ variable DU.

Telegram with variable information section and data field length…

SD2

LE LEr SD DA SA FC DSAP SSAP DU FCS ED

68H X x 68H xx xx x 3CH 3EH x..x X 16H

←-----------VAR LENGTH

-------------

→

Data telegram with variable data length. Used in SRD service (Send

and Request Data with acknowledge) which allows output data to be sent

and input data to be received in one telegram cycle.

Start Delimiter SD3 (SD=A2H)

Telegram w/ fixed DU.

Telegram with fixed information section and data field length…

SD3

DA SA FC DU FCS ED

A2H xx xx x x..x x 16H

This delimiter is used for data telegrams with fixed data length (the DU

data is always 8 bytes long).

Start Delimiter SD4 (SD=DCH)

Token Telegram

Master-to-master token telegram…

SD4

DA SA ED

DCH xx xx 16H

This delimiter is used between 2 active bus stations to grant bus access

rights.

No Start Delimiter

No Start Delimiter - Short Acknowledgement Telegram…

E5H

The short acknowledgement frame SC is a 1 byte

message that can be used to positively acknowledge

an SDA request (ProfiBus FMS only), or negatively

acknowledge an SRD request.

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Siemens SPC3 Specifications Page 17

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