GE VersaPoint IC220PBI002, User Manual

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8-22 VersaPoint™ I/O System Profibus-DP NIU User’s Manual – August 2005 GFK-1911B
8
Examples of Communications using a Virtual C1 Module
The same examples are used here as for DP/V1 services..
Example 1, Reading the Connected Local PCP Devices and Their Status
(Slot 0, Index 5 on the NIU)
Read request (master -> slave)
Data (4 Words VC1) Data Structure
03 00 00 05 00 I 00 00 00 Read/Slot/Index high/Index low/Subindex I 3 bytes
unused
Read response (slave -> master)
Data (4 Words VC1) Data Structure
83 00 03 03 01 00 I 00 00 Read response/Status/Actual length/3 bytes of object
data I 2 bytes unused
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