Eaton easyE4

6. Function blocks
6.1 Manufacturer function blocks
Parameter set
 Description Note
Function block release by
EN is necessary
If this checkbox is enabled, the
state of function block input EN will
be evaluated. If the checkbox is dis-
abled instead, the function block
will be enabled and function block
input EN will not do anything.
This parameter ensures that
when existing programs are
copied, the functionality of the
function blocks that are carried
over will be retained. The para-
meter will be automatically set to
0 or 1 depending on the function
block.
Parameter display
+ Call enabled
Constants can be edited on the
device, as can function block para-
meters when using the EDP pro-
gramming language.

Simulation possible


Other
Retention
The function block does not recognize retentive data.
Heating and cooling
Actual value I1 (temperature) is higher than setpoint I2, meaning that cooling is
required.
Function block output Q1 =1 switches the cooling system on as soon as (I1-I2) > XH.
Actual value I1 (temperature) is lower than setpoint I2, meaning that heating is
required.
Function block output Q2 = 1 switches the heating system on as soon as (I1-I2) > XH
Hysteresis values H1 and H2 determine how long cooling or heating is required and,
accordingly, the cooling/heating energy content.
Fig. 204: Signal diagram for three-step controller
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