Acyclic communication (DP/V1 and PCP)
7725_en_01
PHOENIX CONTACT
3-21
For the bus coupler the service is finished as soon as the last fragment has been
transmitted. If the next service byte differs from the previous one, the next read/write access
can be started immediately. Alternatively, the last fragment can be acknowledged or "Clear"
can be sent.
Acknowledgment of the last fragment:
or
Clear:
Read request (master -> slave) - End fragment acknowledgment
Data (4 words VC1)
Data structure
C0 I 00 00 00 00 00 00 00
End fragment acknowledgment/7 bytes unused
Read response (slave -> master)
Data (4 words VC1)
Data structure
00 00 00 00 00 00 00 00
Clear
Clear request (master -> slave)
Data (4 words VC1)
Data structure
00 I 00 00 00 00 00 00 00
Clear request/7 bytes unused
Clear response (slave -> master)
Data (4 words VC1)
Data structure
00 00 00 00 00 00 00 00
Clear response