Ton; Tof; Function Block; Implemented Languages - Satec Expertmeter PM180 Reference Manual

LE_THRESHOLD function is shown in the figure below.

2.3.9 TON

TON function is used for making time delays.
TON function returns TRUE if input IN changes from FALSE to TRUE with
the delay set via input PT.
In this function IN is control input (BOOL), input PT is used for setting
time delay in milliseconds.
TON function is shown in the figure below.

2.3.10 TOF

TOF function is used for making time delays.
TOF function returns FALSE if input IN changes from TRUE to FALSE
with the delay set via input PT.
In this function IN is control input (BOOL), input PT is used for setting
time delay in milliseconds.
TOF function is shown in the figure below.

2.4 Function block

Function Block (FB) is a type of Program Organization Unit. It has set of
input variables and output variables. Each block has an algorithm,
which enables evaluation of all its inputs and produces set of output
values. Unlike functions, function blocks also have temporary variables,
which store intermediate values during its evaluation. The execution of
a function block can also depend on its own output in a previous
instance of execution.
Function block can include build-in functions.

2.5 Implemented languages

There are two graphical languages implemented in PLC Configurator:
 Function Block Diagram (FBD).
 Ladder Diagram (LD).
Figure 8 - LE_THRESHOLD
Figure 9 - TON
Figure 10 - TOF
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