Description

Function description

These functions are used to specify the dead zone for controlled variables.

and can be configured as additional parameters.

Formula

Block formula:

Assuming: DZ ≥ 0

Y = GAIN x X for -DZ ≤ X ≤ DZ

Y = (X - DZ) + GAIN x DZ for X > DZ

Y = (X + DZ) - GAIN x DZ for X < -DZ

Appearance in FBD

Block Presentation DEAD_ZONE:

Appearance in LD

Block Presentation DEAD_ZONE:

Appearance in IL

Block Presentation DEAD_ZONE:

LD Input
DEAD_ZONE HalfWidth, Gradient
ST Output

Appearance in ST

Block Presentation DEAD_ZONE:

Output := DEAD_ZONE (Input, HalfWidth, Gradient) ;

Parameter description

Description of input parameters:

Parameter	Data type	Description
X	REAL	Input variable
DZ	REAL	Half width of the dead zone
GAIN	REAL	Gradient within the dead zone

Description of output parameters:

Parameter	Data type	Description
Y	REAL	Output variable

Runtime error

For a list of all block error codes and values, see Measurement.

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".

REAL

The REAL type is encoded in a 32 bit format.

The possible value ranges are shown in the figure below:

When a result is:

between -1,175494e-38 and 1,175494e-38, it is considered to be a DEN;
less than -3.402824e+38, the symbol -INF (for - infinity) is displayed;
greater than +3.402824e+38, the symbol INF (for + infinity) is displayed;
undefined (square root of a negative number), the symbolNAN is displayed.

NOTE: The IEC 559 standard defines two classes of NAN: the silent NAN (QNAN) and the signaling NAN (SNAN). A QNAN is a NAN with a most significant fraction bit while an SNAN is a NAN without a most significant fraction bit (bit number 22). QNANs can be propagated via most arithmetic operations without throwing an exception. As for SNANs, they generally indicate n invalid operation when they are used as operands in arithmetic operations (see %SW17 and %S18).

NOTE: When a DEN (non-standardized number) is used as an operand, the result is not significant.