Functions
8.7 Communication via USS
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
8-33
Rules for processing requests/responses
● A request or a response can only ever refer to one parameter.
● The master must repeat a request continuously until it has received the appropriate
response.
● 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.
● The complete request must be sent in one telegram. Request telegrams cannot be split.
The same applies to responses.
● In the case of response telegrams which contain parameter values, the drive always
returns the momentary parameter value when repeating response telegrams.
● 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.
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