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Service Access Points
In the FLC, a data transfer service is handled using a Service Access Point,
SAP). On each node, up to 64 SAPs are possible (SAP [0..63] and the DEFAULT
SAP).
Communication between a DEFAULT SAP and a SAP is possible. The SPC 4-2
performs a validation of the request SSAPs.
Each service access point (including the DEFAULT SAP) has special entries in the
SAP list with which the FLC provides receive resources. If the SPC 4-2 receives a
frame a non-existent SAP, it replies with "no service activated" (SD1 response).
Individual registers are assigned to each SAP in the SAP list once this has been
written.
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PROFIBUS Controller SPC 4®-2 LF
C79000-G8976-C157-3
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