How to validate 2 channel DI

Epec Programming and Libraries Manual

Supported platforms: CODESYS 3.5, CODESYS 3.5 SAFETY

This section describes how to read and validate a 2 channel digital input.

This example uses the following libraries:

S_ADCToVoltageOrCurrent, S_VoltageToDI and S_DebounceDI POUs are included in the code template generated by MultiTool Creator.

The following image is an architecture example for a 2 channel DI validation.

When the following example is used with non-safety I/O, the I/O variables are generated in Inputs program instead of S_Inputs.

The following example shows the validation of 2 safety related DIs done by Switch1 and Switch2 DI inputs defined in MultiTool Creator.

Safe PRG:

Init method:

IF NOT initDone THEN

ValidateSwitchDI.Init(

S_i_InvertedCh2:=TRUE ,

S_i_DiagnosticDelay:=30 ,

S_i_SafeOutputState:=FALSE ,

i_pEventCode:=ADR(S_Inputs.o_EventCode_Switch1) ,

i_pEventCodeCh2:=ADR(S_Inputs.o_EventCode_Switch2) );

initDone:=TRUE;

END_IF