GE VersaPoint IC220PBI002 User Manual page 146

8
Example 5, Reading a Non-Existent Object on an I/O Module with PCP
Functions (Access to 5C00, Subindex 0 on a VersaPoint RS-232
Communications Module2, Slot 3)
Read request (master -> slave)
Data (4 Words VC1)
01 03 5C 00 00 I 00 00 00
Read response (slave -> master) 44
fragment indicates an error. 06
which indicates that the addressed index does not exist, see also "Error Codes for
PCP Communication" on page7-19.
Data (4 Words VC1)
81 44 06 07 00 00 I 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
8-26 VersaPoint™ I/O System Profibus-DP NIU User's Manual – August 2005
Data Structure
Read PCP/Slot/Index high/Index low/Subindex I 3
bytes unused
in the read response of the start
hex
and 07 in this example are the error code,
hex hex
Data Structure
Read response/Status/4 bytes of error code I 4
bytes unused
Data Structure
Abort
Data Structure
Abort response
Data Structure
Clear
Data Structure
Clear response
so
hex
GFK-1911B