Codesys Ladder Programming Timer: TOF,TON And TP

Published on May18, 2021 | Category: timer

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in codesys ladder programming have three types of timer, pulse timer TP, turn-off delay TOF and turn on delay timer TON, input IN and preset time (PT) are input and elapsed time (ET) and output Q are output.To add an enable input and enable output to the instruction, select [With EN/ENO] from the Instructions pane (LD, FBD or IL editor).

codesys pulse timer TP

The function block TP allows you to program a pulse timer with a defined clock period. input IN and Preset time PT are input variables of the BOOL and TIME data types respectively. output Q and elapse time ET are output variables of the BOOL and TIME data types. when IN is False or set to 0 then Q is FALSE and set to 0 and ET is 0. if IN set to true or set to 1 then timer begin to be counted in milliseconds until PT = ET then remain constant. Q is TRUE or set to 1 if IN is set to TRUE and ET is less than or equal to PT. Otherwise it is FALSE.

instance TP_instance data type TP
IN start_timer data type BOOL. Rising edge starts the pulse timer and sets Q to TRUE
PT preset TIME for example t#10s or t#10ms . Length of the pulse.
ET data type time. Elapsed time since pulse timer started. It will then remain constant after PT is reached.
Q output data type bool

codesys turn-off delay timer TOF

The function block TOF allows you to program a switch-off delay. in TOF input variables are IN and PT data type BOOL and TIME. Q and E are output variables BOOL and TIME are data types. If IN is TRUE, the outputs are TRUE. when IN becomes true to false, timer start counting in milliseconds until its value is equal to PT, then It will then remain constant. Q is FALSE when IN is FALSE and ET equal to or less then PT. Otherwise it is TRUE.

instance name data tye TOF
IN data type is BOOL. Falling edge: starts delay counter and Rising edge: resets delay counter
PT preset TIME for example t#10s or t#10ms .Time for the delay counter [ms].
ET data type time. Elapsed time since falling edge at IN.
Q output data type bool

codesys turn-on delay timer TON

The function block Timer On Delay implements a turn-on delay.TON(IN, PT, Q, ET) means: IN and PT are input variables of the BOOL and TIME data types respectively. Q and ET are output variables of the BOOL and TIME data types respectively. If IN is FALSE , Q is FALSE and ET is 0. As soon as IN becomes TRUE, the time will begin to be counted in milliseconds until ET = PT then remain constant and output Q is TRUE. Q is True PT = ET Otherwise it is FALSE. Thus, Q has a rising edge when the time indicated in PT in milliseconds has run out.

instance name data tye TON
IN data type is BOOL. Rising edge: starts delay counter,Falling edge: resets delay counter
PT preset TIME for example t#10s or t#10ms .Time for the delay counter [ms].
ET data type time. Elapsed time since falling edge at IN.
Q output data type bool, FALSE if IN is FALSE TRUE if IN is TRUE and delay time PT elapsed

Time Constant

TIME constants can be declared in CoDeSys. These are generally used to operate the timer in the standard library. A TIME constant is always made up of an initial "t" or "T" and a number sign "#".

days identified by d. example t#1d
hours identified by h. example t#10h;
minutes identified by m. example t#10m;
seconds identified by s. example t#10s;
milliseconds identified by ms. example T#10ms;

codesys convert another data type into time

so if you want to convert int, DINT, DWORD etc. in TIME format so you can use convert block like DATATYPE_TO TIME and if you want to conver time into another data type use TIME_TO_DATATYPE.

WORD_TO_TIME, WORD in TIME
DWORD_TO_TIME, DOUBLE WORD in TIME
INT_TO_TIME, INTEGER into TIME
DINT_TO_TIME, DOUBLE INTEGER into TIME
REAL_TO_TIME, REAL into TIME

codesys conversion of time value to other data types

for conversion of time value into another data type used following blocks

TIME_TO_WORD, TIME into WORD
TIME_TO_DWORD, TIME into DOUBLE WORD
TIME_TO_INT, TIME into INTEGER
TIME_TO_DINT, TIME into DOUBLE INTEGER
TIME_TO_REAL, TIME into REAL

"NOTE:_in codesys you can convert more data types into time but above are useful in industry purpose."

codesys example of timer

consider a simple example, in this programming example timer input bit (IN) is depended on equal compare block output. compare block compare preset (PT) and elapsed time(ET) value if both are equal output of compare block set to true this condition stop timer as soon as when timer stop estimate timer(ET) value set to 0 and not equal to preset value so output of compare block set to false then timer again start from begining.