User Manual

Function blocks
125
08/04 AWB2528-1423GB
Analog value comparator/threshold value switch
easy800 provides 32 analog value comparators from A 01 to
A 32.
With an analog value comparator or threshold value switch
you can, for example, compare analog input values with a
setpoint value.
All easy800 DC variants have analog inputs.
The following comparisons are possible:
• Function block input
>I1 greater than or equal to,
equal to, less than or equal to function block input
>I2
• Using the factors >F1 and >F2 as inputs enables you to
amplify and adjust the values of the function block inputs.
•The
>OS function block input can be used as an offset for
the
>I1 input.
•The
>HY function block input is used for the positive and
negative switching hysteresis of the input
>I2. The
contact switches in accordance with the comparison mode
of the function block.
h
Attention!
The function blocks are designed so that a function block
output can be assigned directly to the input of another
function block. This enables you always to have an
overview which value is transferred.
If different data formats are used, such as if the first
function block uses 32 bits and an 8-bit or 16-bit format is
used for further processing, sign value errors or value
errors may occur when transferring from one function
block to another one.