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Introduction To ProfiBus DP

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The response telegram format is the same as noted above, but with the

DSAP/SSAP mirrored (swapped) and the DU bytes embedded.

Read_Outp Telegram – SAP 57

The master can use the Read Outputs telegram to

asynchronously

read

the output data (Outp_Data) of any slave in Data_Exchange mode.

SD LE LEr SD DA SA FC DSAP SSAP FCS ED

68H 05H 05H 68H 8x 8x X 39H

(57)

3EH

(62)

X 16H

The response telegram format is the same as noted above, but with the

DSAP/SSAP mirrored (swapped) and the DU bytes embedded.

Global_Control Service – SAP 58

ProfiBus DP uses the Global Control function to send special

commands addressed to a single slave, a specific group of slaves (multi-

cast), or to all slaves at once (broadcast). ProfiBus sends broadcast and

multi-cast messages as global control telegrams using address 127 (an

optional group number is included for a select group with multi-cast).

Using SDN transmission (Send Data with No acknowledge), a class 1

master will use the Global_Control service to inform the slaves of his mode

(Operating or Clear Mode), or to send commands such as sync, unsync,

freeze, unfreeze, and clear data to a group of slaves, typically for

synchronization purposes. Note that a slave will only accept this command

from the same master that parameterized and configured it. There is no

response returned to an SDN telegram.

Global_Control Telegram

SD LE LEr SD DA SA FC DSAP SSAP DU FCS ED

68H X X 68H 8x 8x X 3EH

(62)

3AH

(58)

X.. X 16H

DU Byte 1 (Control_Command To Be Executed)

765 4 3 2 1 0

Res. Res.

Sync Unsync Freeze Unfreeze Clear_Data

All outputs

cleared.

Res.

0 0 00=No Function

01=Deactivated

10=Activated

11=Deactivated

00=No Function

01=Deactivated

10=Activated

11=Deactivated

0=Do Not

Clear Outp

1=Clear

Outputs

Sync:

The output states transferred in Data_Exchange are delivered and

frozen. The output data which follows is held until the next Sync

command or Unsync command.

Unsync:

This control cancels the sync command.

Freeze:

This causes the states of the inputs to be read and frozen until the

next Freeze command or Unfreeze. Slaves must ensure that following

a freeze command, the last frozen values of the inputs must be

transferred in the next data exchange cycle.

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Siemens SPC3 Especificaciones Pagina 34

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