GFK-1911B
Chapter 8 Communications
8-27
8
Example 6, In the Event of an Error: Reading an Object on an I/O Module
Without PCP Functions (Access to 5FF0, Subindex 0 on an 8-Point
Discrete Output Module at Slot 2)
Read request (master -> slave)
Data (4 Words VC1)
Data Structure
01 02 5F F0 00 I 00 00 00
Read PCP/Slot/Index high/Index low/Subindex I 3
bytes unused
Read response (slave -> master)
D2
hex
in the read response indicates an error.
An error has occurred if the second byte of the response (= status byte) does not
equal 0, see "Error Codes for DP/V1 and VC1Communication".
Data (4 Words VC1)
Data Structure
81 D2 00 I 00 00 00 00 00
Read response/Status or 2 bytes of error code I 5
bytes unused
Abort request (master -> slave)
Communication can be reset using 60
hex
so
that all buffers involved in the communication are set to their initial status.
Data (4 Words VC1)
Data Structure
60 xx xx xx xx xx xx xx
Abort
Abort response (slave -> master)
Data (4 Words VC1)
Data Structure
E0 00 00 00 00 00 00 00
Abort response
Clear request (master -> slave)
Data (4 Words VC1)
Data Structure
00 xx xx xx xx xx xx xx
Clear
Clear response (slave -> master)
Data (4 Words VC1)
Data Structure
00 00 00 00 00 00 00 00
Clear response
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