Acyclic communication (DP/V1 and PCP)
7725_en_01
PHOENIX CONTACT
3-23
Example 5:
In the event of an error: Reading a faulty object index on the connected
IB IL AI4/EF (slot 3, index 0180)
Status byte 44
hex
indicates an error during execution. In this case, the PCP read request is
sent to the I/O terminal first. However, the I/O terminal does not recognize index 0180
hex
and acknowledges it using error code 06 07. According to "Appendix" on page A-1, this
means that this object does not exist. The last 2 bytes are also part of the PCP error data,
however, they are not used in this example. If they do not equal zero, refer to the relevant
device data sheet for more detailed information.
The communication data can be reset to the initial state via "Clear".
Read request (master -> slave) - Start fragment
Data (4 words VC1)
Data structure
06 03 00 01 80 00 I 00 00
Read request (I/O)/Slot/Invoke ID/
Index high/Index low/Subindex/
2 bytes unused
Write response (slave -> master)
Data (4 words VC1)
Data structure
86 44 06 07 00 00 I 00 00
Read response/Status/4 bytes of error code/
2 bytes unused
Clear request (master -> slave)
Data (4 words VC1)
Data structure
00 I 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