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Kuhnke Electronics Instruction Manual

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6.2.2 Receive Parameter Data (Prm_Data)<br />

PROFIBUS<br />

The parameters of passive stations (slaves) are set during<br />

DP system startup. The master transmits all parameter<br />

data to the DP slave (here: Ventura Remote PLC DP).<br />

The master is also allowed to send/change parameter<br />

settings during operation.<br />

The first 7 bytes (octets 1...7) contain the general bus<br />

parameters. They are obligatory for all DP slaves and<br />

generally supported by the usual configuration tools.<br />

Starting with byte 8, you can transmit device-specific<br />

parameters. These parameters deserve special attention<br />

because they affect the functions of the unit concerned.<br />

6.2.2.1 General Bus Parameters<br />

Octet 1: Station_status<br />

See EN 50170, "Parameter Data Transmission" for details<br />

Octet 2: WD_Fact_1<br />

Range: 1...255<br />

Octet 3: WD_Fact_2<br />

Range: 1...255<br />

Octets 2 and 3 use the following equation to define the<br />

response monitoring timeout (watchdog time, TWD):<br />

TWD [s] = 10 ms * WD_FACT_1 * WD_FACT_2<br />

This allows you to set times between 10 ms and 650 s<br />

that are entirely independent of the baud rate. When the<br />

watchdog control reacts the unit reports the event as error<br />

no. 3 (� section 8.3.3).<br />

157

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