Siemens SIMATIC NET PROFIBUS Manual de Serviço descarregar pdf (Página 198)

Description of the DP Functions, Data, and Error Codes

DP Base Programming Interface for CP 5613/CP 5614

198

C79000-G8976-C108-01

Byte 1 (Station_status)

Byte 1 "Station_status" has the following structure:

Each bit in the "station_status“ byte has a special meaning.

Bit Meaning

7 and 6

Lock_Req and Unlock_Req

Bit 7 Bit 6 Meaning

The min T

SDR

is overwritten when parameters

are assigned. All other parameters remain

unchanged.

0 1 The DP slave is released for other masters.

The DP slave is disabled for other masters, all

parameters are adopted

(exception: min T

SDR

= 0).

1 1 The DP slave is released for other masters.

Sync_Req

This bit indicates to the slave that it must operate in the Sync mode

as soon as the command is transferred with the dpn_global_crtl()

function.

Freeze_Req

This bit indicates to a DP slave that it must operate in the freeze

mode as soon as the command is transferred with the

dpn_global_ctrl() function.

Watchdog

If this bit is set to zero, the watchdog monitoring is deactivated. If the

bit is set, the watchdog monitoring is activated on the DP slave.

2 to 0 reserved

Bytes 2 and 3 (WD_Fact_1 and WD_Fact_2)

These two bytes contain factors for setting the watchdog time (T

The watchdog ensures that if this time expires after a DP master has failed, the

outputs are set to a safe state.

[ms] = 10 * WD_Fact_1 * WD_Fact_2

1 2 ... 193 194 195 196 197 198 199 200 201 202 203 ... 237 238

Sem comentários

Siemens SIMATIC NET PROFIBUS Manual de Serviço Página 198