FB_CheckIoMapping

This class checks for an I/O element that supports I_InputBase or I_OutputBase whether the ProcessValue (or, in the case of outputs, the ProcessFeedback) is cyclically synchronized via a TwinCAT mapping (e.g. with I/O).

	Mapping analysis generates artificial noise For analysis purposes, the function block describes the values to be interpreted with an artificial noise. If other parts of the program also read out the signal, this noise can lead to misinterpretations! The effects of synchronized mappings can be minimized by placing the I/O check as the last access to the I/O element within the PLC cycle.

Syntax:

FUNCTION_BLOCK FB_CheckIoMapping EXTENDS FB_MessageBase

Properties

Name	Type	Access	Description
Busy	BOOL	Get	A check is currently being carried out.
Done	BOOL	Get	The mappings have been checked.
Error	BOOL	Get	An error has occurred while checking the mappings.
ErrorId	UDINT	Get	Error code of the last error that occurred.
IoDevice	I_IoBase	Get, Set	I/O object to be checked.
IsMapped	BOOL	Get	TRUE if an active mapping was detected during the check.

Methods

Name	Description
Cyclic()	Cycle method
DoCheck(`bExecute`)	Starts the check of the assigned I/O object.

Interfaces

Type	Description
I_CheckIoMapping	Standard interfaces on FB_CheckIoMapping.

Requirements

Development environment	Target platform	PLC libraries to include
TwinCAT v3.1.4024.71	PC or CX (x64, x86)	Tc3_PlasticFunctions (>= v12.12.0.0)