Siemens SPC3 Specifications download pdf (Page 25)

Introduction To ProfiBus DP

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Set_Prm Telegram DU Byte 3 – WD_Fact_2, Range 1 to 255

76543210

XXXXXXXX

WD_Fact_2

The watchdog is switched on or off via the WD_On bit of DU byte 1.

Bytes 2 & 3 are factors used for setting the watchdog control (T

) time.

The watchdog time is calculated between 10ms and 650 seconds as follows:

=10ms * WD_Fact_1 * WD_Fact_2. The watchdog control causes the

slave outputs to go to a failsafe state if the master fails to communicate with

the slave before this time expires.

Set_Prm Telegram DU Byte 4 – Min T

SDR

, Range 11 to 255 Tbit

76543210

XXXXXXXX

Min T

SDR

: Minimum time in Tbit (bit time) after which a slave is allowed to answer. This

value must be less than Max T

SDR

. 11 Tbits are specified permanently in the standard.

Byte 4 sets the minimum T

SDR

time (in bit time, 11-255) a slave will wait

before it is allowed to send a response to the master. If 00H is specified, the

previous or default value is used.

Set_Prm Telegram DU Byte 5 (Ident_Number, High Byte)

76543210

XXXXXXXX

Set_Prm Telegram DU Byte 6 (Ident_Number, Low Byte)

76543210

XXXXXXXX

The Ident_Number of the slave is transmitted for security purposes.

The Set_Prm parameters will not be accepted if this number does not match

that of the slave. However, the min T

SDR

can still be set if the Ident_number

doesn’t match and both the Lock_Req and Unlock_Req bits are set to 0.

Set_Prm Telegram DU Byte 7 (Group_Ident)

76543210

XXXXXXXX

Group_Ident

ProfiBus DP supports multi-cast messaging via a Global_Control

telegram function directed to a specific group of connected slaves identified

via this group number. Each bit represents a unique group. Note that

Group_Ident is only accepted if the Lock_Req bit is also set.

Set_Prm Telegram DU Bytes 8 to 32 or 244 (Optional, User_Prm_Data)

76543210

XXXXXXXX

Spec_User_Prm_Byte 8 (SPC3 ASIC related)

00000

WD_

Base

Dis_

Stopbit

Dis_

Startbit

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 37 38

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Siemens SPC3 Specifications Page 25

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