GE VersaPoint IC220PBI002 User Manual page 147

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)
01 02 5F F0 00 I 00 00 00
Read response (slave -> master) D2
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)
81 D2 00 I 00 00 00 00 00
Abort request (master -> slave) Communication can be reset using 60
that all buffers involved in the communication are set to their initial status.
Data (4 Words VC1)
60 xx xx xx xx xx xx xx
Abort response (slave -> master)
Data (4 Words VC1)
E0 00 00 00 00 00 00 00
Clear request (master -> slave)
Data (4 Words VC1)
00 xx xx xx xx xx xx xx
Clear response (slave -> master)
Data (4 Words VC1)
00 00 00 00 00 00 00 00
GFK-1911B Chapter 8 Communications
Data Structure
Read PCP/Slot/Index high/Index low/Subindex I 3
bytes unused
in the read response indicates an error.
hex
Data Structure
Read response/Status or 2 bytes of error code I 5
bytes unused
Data Structure
Abort
Data Structure
Abort response
Data Structure
Clear
Data Structure
Clear response
8
so
hex
8-27