Sine wave generator
- Block name
- ST call
- Library
- Version
- Description
- Inputs
- Outputs
- Function
- Application example

Sine wave generator

Block name

B3_SINUS_GENERATOR

ST call

PROGRAM B3_TEST
VAR 
    O1,O2: REAL;
    FB: LIB.CORE.V1_1.B3_SINUS_GENERATOR:= (T:= T#10S, MINIMUM:= -10, MAXIMUM:= 10);
END_VAR
 
 FB(OUT => O1, TRES => O2);
END_PROGRAM

Library

LIB\CORE

Version

V1.1

Description

The block generates a sine signal at which period, and minimum and maximum values can be set. Remaining time until end of the period is also indicated at the output.

Version V1.1

Correction of a combination of short cycles and long periods (eg cycle 1 ms and period 60 s). The generator did not hold time base and generated incorrect timing.

Inputs

Input	Type	Description	Default value
ENABLE	BOOL	Block function enable	True
T	TIME	Output signal period	5s
MINIMUM	REAL	Minimum value (low peak) of the output signal	0
MAXIMUM	REAL	Maximum value (high peak) of the output signal	1
PAUSING	BOOL	Behaviour when Disabled	True

Outputs

Output	Type	Description
OUT	REAL	Output sine signal
TRES	TIME	Time remaining until the end of the period

Function

The output signal OUT provides a sine wave signal with period of T a and lower/upper peaks MINIMUM and MAXIMUM respectively. There is a Tres signal which is time remaining until the end of the period T, see figure below. The block has a Boolean input ENABLE, which stops the generator (stopped: ENABLE: = false). The behavior after the block has been stopped depends on the PAUSING parameter (see figure below):

PAUSING=FALSE and ENABLE=FALSE: the output OUT is set to MINIMUM + MAXIMUM / 2. As soon as ENABLE goes to TRUE, the period time starts from the beginning.

PAUSING=TRUE and ENABLE=FALSE: the output OUT is frozen. As soon as ENABLE goes to TRUE, the sine wave continues from where it has been stopped.

Application example

Function B3 generates a sine signal at the O1 output with period of 10 seconds, minimum value of -10, and maximum value of 10.

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