Lenze PLC Designer PLC Designer (R3-1) Instrukcja Użytkownika Pobierz pdf (Strona 55)

L-force | PLC Designer

Lenze Specific Functions

 DMS 4.1 EN 03/2011 TD29 53

2.3 PLC program for documentation of a cycle time violation

In the logbook of the L-force controller, you can document a cycle time violation by

means of the code described below.

When you are specifying the required cycle time of a PLC project, please follow the

procedures described in the communication manuals "Control Technology CANopen"

and "Control Technology EtherCAT" (section: "Specifying the minimum cycle time of

the PLC project").

Function:

• Information about a task can be requested from the "CmplecTask" system library

by means of variables of the type "Task_Info".

• The function "L_AddLog" can be used to generate a log entry in the logbook of the

L-force controller from the PLC.

• If the measured jitter is greater than the cycle time, a task cycle has failed and a

corresponding log entry is created in the logbook of the L-force controller.

Precondition:

• The libraries "CmpIecTask" and "SysTypes" have been integrated in the PLC

Designer project.

• The code indicated below must be called cyclically in the task to be examined.

Example of cycle time monitoring:

VAR

pIecTaskResult : POINTER TO RTS_IEC_RESULT;

tIecTaskHandle : RTS_IEC_HANDLE;

pIecTaskInfo : POINTER TO Task_Info;

tTaskInfo : Task_Info;

END_VAR

------------------------------------------------------------------------

tIecTaskHandle := IecTaskGetCurrent( pIecTaskResult );

pIecTaskInfo := IecTaskGetInfo2( tIecTaskHandle, pIecTaskResult );

tTaskInfo := pIecTaskInfo^;

IF ABS(tTaskInfo.iJitter) > TIME_TO_DINT(tTaskInfo.tInterval) THEN

L_AddLog(eSeverity:= L_TSeverity.L_LogWarning,

eFacility:= L_TFacility.L_PLC_USER_LOG_SCOPE1,

sLogPayLoad:= 'Violation of cycle time PRG');

END_IF

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Lenze PLC Designer PLC Designer (R3-1) Instrukcja Użytkownika Strona 55