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ii Table of Contents

Item Names .................................................................................................................... 26

Siemens SIMATIC S7 PLC Item Naming .............................................................. 26

Data Blocks DB (Datenbausteine)................................................................... 27

Flag Bytes (Merker)......................................................................................... 28

Input Bytes (Eingänge) .................................................................................... 30

Output Bytes (Ausgänge)................................................................................. 32

Peripheral Input Bytes (Peripherieeingänge) ................................................... 33

Peripheral Output Bytes (Peripherieausgänge) ................................................ 35

Counters........................................................................................................... 37

Timers.............................................................................................................. 37

Block Items...................................................................................................... 37

Alarms and Events ........................................................................................... 39

Predefined Item/Point Names......................................................................................... 42

UPDATEINTERVAL Item..................................................................................... 42

MAXINTERVAL Item........................................................................................... 42

STORESETTINGS Item......................................................................................... 43

ITEMCOUNT Item................................................................................................. 43

ERRORCOUNT Item ............................................................................................. 43

WRITECOMPLETE Item ...................................................................................... 44

STATUS Item......................................................................................................... 44

READCOMPLETE Item ........................................................................................ 45

POLLNOW Item..................................................................................................... 45

Monitoring the Status of Communications with a PLC.................................................. 46

Using the Status Item in Excel ................................................................................ 46

Monitoring the Status of Communications with InTouch............................................... 46

Using DDEStatus and IOStatus in Excel................................................................. 46

Reading Values from the I/O Server into Excel............................................................. 47

Writing Values to the I/O Server from Excel................................................................. 48

Troubleshooting I/O Server Communication Problems ................................................. 49

Debugging Communication Between InTouch and an I/O Server .......................... 49

Debugging Communication Between SuiteLink and an I/O Server ........................ 51

Debugging Communication Between an I/O Server and a PLC.............................. 52

Special Wonderware Logger Messages.......................................................................... 60

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