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Series 90 PLC Modem Serial Link .....................................................................1-2
Multidrop Series 90 PLC Serial Connection.......................................................1-3
Using this Manual .............................................................................................................1-5
Communications Architecture ..........................................................................................1-5
Configuration Layer............................................................................................1-5
Session Layer......................................................................................................1-5
Application Layer ...............................................................................................1-5
Service Requests Available to the SNP User ....................................................................1-6
Change Privilege Level.......................................................................................1-6
Read and Write PLC Memory ............................................................................1-6
PLC Short Status.................................................................................................1-7
Return Control Program Name ...........................................................................1-7
Return Controller TYPE and ID .........................................................................1-7
Return PLC Time/Date .......................................................................................1-7
Return Fault Table ..............................................................................................1-7
Clear Fault Table ................................................................................................1-7
Programmer Logon .............................................................................................1-7
Set Control ID (CPU ID) ............