System parameters

Here you can unpack the complete PLC sources: TutorialSample.zip

The common ASDU address and the user functions of the controlling station are configured via the system parameters.

In our introduction we configure the following system parameters:

• The common ASDU address is set to 7. (asduAddr);
• The octet size of cause of transmission is set to two octets (one octet COT + one octet originator address) (eCOTSize);
• The octet size of common asdu address is set to two octets (eAsduAddrSize);
• The octet size of information object address is set to three octets (eObjAddrSize);
• Logging of debugging messages in the application log is activated (dbgMode). Logging of device state changes and link layer errors is enabled;

Add the following PLC code to your PLC project:

IF init THEN
    init := FALSE;
...


    client.sysPara.asduAddr := 7;
    client.sysPara.asduFmt.eCOTSize := eIEC870_COT_TwoOctets;(* cause of transfer octet size *)
 client.sysPara.asduFmt.eAsduAddrSize := eIEC870_AsduAddr_TwoOctets;(* common ASDU address octet size *)
 client.sysPara.asduFmt.eObjAddrSize := eIEC870_ObjAddr_ThreeOctets;(* information object address octet size *)
 client.sysPara.dbgMode := IEC870_DEBUGMODE_DEVSTATE OR IEC870_DEBUGMODE_LINKERROR;(* IEC870_DEBUGMODE_ASDU OR IEC870_DEBUGMODE_LINKLAYER *)

...

ELSE
    client( pInputs := ADR( inputs ),
        cbInputs := SIZEOF( inputs ),
        pOutputs := ADR( outputs ),
...

END_IF

The documentation for all system parameters can be found here: ST_IEC870_5_101SystemParams.