Siemens SPC3 Specifications download pdf (Page 24)

Introduction To ProfiBus DP

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Set_Prm Telegram – SAP 61

This function is used to set the parameters of a slave at startup, after a

restart or system reset, and at any time except within data exchange mode.

At a minimum, the parameterization telegram contains 7 bytes of specific

information required by the ProfiBus standard. This includes: Response

Monitoring/Watchdog Time T

, T

SDR

time for Master/Slave timing,

Freeze/Sync Mode Enable/Disable, Lock/Unlock Slave for this Master,

Group Assignment, Master Address, and Identification Number. Additionally,

it may also contain other user-related parameters in bytes 8 to 32, or up to

244.

Set_Prm Parameterization Telegram With Header

SD LE LEr SD DA SA FC DSAP SSAP

DU FCS ED

68H X X X 8x 8x X 3DH

(61)

3EH

(62)

X.. X 16H

Note that with SRD transmission, the DSAP specifies the Set_Prm

function (61) request, while the SSAP requests that the Chk_Cfg function

(62) follows (return response).

Set_Prm Parameterization Telegram DU Byte 1 – Station_status

76 5 43210

Lock_Req Unlock_Req Sync_Req Freeze_Req WD_On

Reserved –Set to 0

WD_Fact_1

WD_On (Watchdog On):

Set this bit to 1 to activate the watchdog control.

Refer to the Watchdog section for more information.

Freeze_Req (Freeze Mode Request):

If this bit is set, the slave will operate

in the Freeze Mode as soon as the Global_Control function is received.

If a slave does not support the Freeze control, it sets the

Diag.Not_Supported bit within the diagnostic information.

Sync_Req (Sync Mode Request):

If this bit is set, the slave will operate in

Sync Mode as soon as the Global_Control function is received. If a

slave does not support the Sync control, it sets the Diag.Not_Supported

bit within the diagnostic information.

Unlock_Req (Unlock Request):

See Table below.

Lock_Req (Lock Request):

See Table below.

Lock

Bit 7

Unlock

Bit 6 Description

0 0 The Min T

SDR

parameter may be changed. All other

parameters remain unchanged.

0 1 DP Slave is unlocked/released for other masters.

1 0 DP Slave locked for other masters. All parameters are

accepted and can be carried over (except min T

SDR

= 0).

1 1 DP Slave is unlocked/released for other masters.

Set_Prm Telegram DU Byte 2 – WD_Fact_1, Range 1 to 255

76543210

XXXXXXXX

WD_Fact_1

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 37 38

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Siemens SPC3 Specifications Page 24

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