ISG_HliInterface

For each PLC system that PLC library contains the function block its urgent to call an instance of the function block if the application needs to get access to the HLI.

Rasing edge at input bStart starts a request to NC-Kernel to get information about number of channels, number of axes of actual configuration. The result of the request is checked against the values inside the PLC. If differences occur output bError becomes TRUE and at output bErrorId appears an error value. If the check is successful output bInitialized changes to TRUE and the PLC application can access via global defined pointers (see Table 15-1) the specific areas of the HLI (see PLC program frame).

Block diagram

Parameters of FB

VAR_INPUT
	bStart	BOOL	Raising edge leads to check if HLI definition on PLC side is the same as on NC-Kernel side.
VAR_OUTPUT
	bBusy	BOOL	Request of information about HLI from NC-Kernel and checking of information is still active.
	bInitialized	BOOL	Check was successful and now its first time allowed to access the HLI.
	bError	BOOL	Is TRUE, if error occurs.
	iErrorId	UDINT	Errror identification. Possible values see Table 15-2.
	iPlcErrorId	UDINT	Specific error value of used PLC system. Detailed explanations see Table 15-2, error value 9 (ISG_PLC_PFORM_ERROR).
	expectedHli	HLI_DIAGNOSTIC	Information about characteristic of HLI on side of PLC. Data structure contains number of some HLI areas and version identifier.
	actualHli	HLI_DIAGNOSTIC	Information about characteristic of HLI on side of NC-Kernel.

Behaviour of the FB

Table of error identifiers

Table 15-2: Values for ErrroID of ISG_HliInterface
Error ID	Global constant	Description
0	ISG_NO_ERROR	All OK no error occurred
1	ISG_WRONG_PARAMETER	Version identifier of HLI of and NC-Kernel are different.
2	ISG_WRONG_PARAMETER	Different characteristic (number channels, number axes, ) of HLI at PLC and NC-Kernel.
9	ISG_PLC_PFORM_ERROR	Error occured in relation with used PLC system. PLC system specific error value is displayed at output iPlcErrorId if available. Example: In case of TwinCAT this may be a ADS error. ADS error value than will be displayed.