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PROFIBUS Optional Board Operating instructions
30
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½
A request or a response can only ever refer to one parameter.
½
The master must repeat a request continuously until it has received the
appropriate response.
½
The master detects the response to a request it has sent by
♦
evaluating the response identifier,
♦
evaluating the parameter number PNU,
♦
evaluating the parameter index IND if necessary, or
♦
evaluating the parameter value PWE if necessary.
½
The complete request must be sent in one telegram. Request telegrams
cannot be split. The same applies to responses.
½
In the case of response telegrams which contain parameter values, the drive
always returns the momentary parameter value when repeating response
telegrams.
½
If no information needs to be fetched from the PKW interface in cyclical
operation (only PZD data are relevant), then the "No request" request telegram
must be issued.
Содержание Micromaster Profibus
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