ONLEVT: Online event

Function description

This procedure can enter online events in the diagnostics buffer. The error recognition E_EFB_ONLEVT and the PARAM input are used for this.

NOTE: If EVT is set permanently to TRUE, each acknowledgement of an event will lead to a new entry in the diagnostic buffer. In addition, keeping EVT input permanently on TRUE will generate unnecessary runtime, due to checking the diagnostic buffer in each scan. Therefore it is recommended to use a rising edge detection at the EVT input in the application.

and can be configured as additional parameters.

Representation in FBD

Representation:

Representation in LD

Representation:

Representation in IL

Representation:

LD DiagBufferFlag
ONLEVT Parameter

Representation in ST

Representation:

ONLEVT (DiagBufferFlag, Parameter);

Parameter description

Description of input parameters:

Parameter	Data type	Description
DiagBufferFlag	BOOL	"1": Entry in diagnostics buffer.
Parameter	WORD	Parameter transferred to the diagnosis buffer.

Runtime error

NOTE: For a list of all block error codes and values, see Diagnostics.

EN stands for ENable; it is an optional block input. When the EN input is enabled, an ENO output is set automatically.

If EN = 0, the block is not enabled; its internal program is not executed, and ENO is set to 0.

If EN = 1, the block's internal program is run and ENO is set to 1. If an error occurs, ENO is set to 0.

If the EN input is not connected, it is set automatically to 1.

ENO

ENO stands for Error NOtification; this is the output associated with the optional input EN.

If ENO is set to 0 (because EN = 0 or in case of an execution error):

the status of the function block outputs remains the same as it was during the previous scanning cycle that executed correctly;
the output(s) of the function, as well as the procedures, are set to "0".

WORD

The type WORD is encoded in a 16 bit format and is used to perform processing on series of bits.

This table shows the upper/lower limits of each of the bases that can be used:

Base	Lower limit	Upper limit
Hexadecimal	16#0	16#FFFF
Octal	8#0	8#177777
Binary	2#0	2#1111111111111111

Examples of representation

Data	Representation in one of the bases
0000000011010011	16#D3
1010101010101010	8#125252
0000000011010011	2#11010011