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Service Access Point (SAP) and PROFIBUS Services
PROFIBUS
Services
G-2
Messages from the connected programmable controller are converted by the
CP 541 to the PROFIBUS services given in Table G-2.
Table G-2
PROFIBUS Services
Communication mode
PLC-PLC connection
Broadcast
DP connection
1
SDA: Send Data with Acknowledge
2
SDN: Send Data with No Acknowledge
3
SRD: Send and Request Data
PROFIBUS service
1
SDA
Low priority
2
SDN
Low priority
3
SRD
See DIN E 19245, Part
3
Communications Processor CP 541
Priority
EWA 4NEB 812 6188-02
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