Documentation

Bool Scheduler (T17)

Time scheduler, bool

Block name

T17_BOOLEAN_SCHEDULER

ST call

PROGRAM TEST_T17
	VAR 
		FB : LIB.HVAC.V1_0.T17_BOOLEAN_SCHEDULER := (TPGVALUE := [(STARTTIME := 0, STATE := FALSE),
		(STARTTIME := 210, STATE := TRUE),
		(STARTTIME := 420, STATE := FALSE)],
		EXCEPTIONS := [(STARTTIME := 1000, ENDTIME := 2000, STATE := FALSE)]);
		DT1:DT;
		BOOL1:BOOL;
	END_VAR
	DT1:=getlocaltime();
	FB(CURRENTTIME:=DT1, OUT=>BOOL1);
END_PROGRAM

Library

LIB\HVAC

Version

V1.0

Description

Time scheduler is a source of a binary signal which changes according to a weekly schedule with maximum 42 events (changes of state). Exception events (exceptions) defined by date, time, and state can be inserted.

Inputs

Outputs

Description of internal structures

Function

The time scheduler compares current date and time with the definition table and sends the actual state to the output. The output is either true or false. The time scheduler can be edited from Idekit Studio or HMI - LCD display, web interface, touchscreen, SCADA or another client).

Application example

Time scheduler is used to enable plant operation according to the operating hours plan, for night depressions, etc. (Use T19_INT_SCHEDULER for multistate output, and T18_REAL_SCHEDULER for direct output of analogue values.)

The image illustrated switching between day and night heating curve. At the daytime the scheduler output is on TRUE, at the nighttime it is on FALSE.

In the editor, the scheduler plan is set up to be TRUE from 6:00 to 22:00, and FALSE otherwise: