Technical
Manual
Temperature
Controller
SCN
‐
RT1
MDT technologies GmbH •
51766 Engelskirchen • Papiermühle 1
Tel.: +49-2263-880 • Fax: +49-2263-4588 • [email protected] • www.mdt.de
30
4.6
Controller
settings
4.6.1
Control
value
The
following
settings
are
available
at
the
ETS
‐
Software:
Illustration
17:
Control
value
The
following
chart
shows
the
dynamic
range
for
this
parameter:
ETS
‐
text
Dynamic
range
[default
value]
comment
Control
value
PI
control
continuous
PI
control
switching
(PWM)
2
‐
step
control
(switching)
The
control
variable
defines
the
used
control
method.
Chart
32:
Control
value
The
controller
contains
of
three
different
controlling
methods,
which
control
the
control
value.
Further
parameterization
options
are
dependent
to
the
adjusted
control
method.
The
following
controller
can
be
chosen:
PI
control
continuous
[4.5.2]
PI
control
switching
(PWM)
[4.5.3]
2
‐
step
control
(switching)
[4.5.4]
The
following
chart
shows
the
relevant
communication
objects:
Number
Name
Length
Usage
8
Control
value
heating
1
Byte/
1
Bit
controlling
of
the
actuator
for
heating
8
Control
value
heating/cooling
1
Byte/
1
Bit
controlling
of
the
combined
actuator
for
heating
and
cooling
9
Control
value
cooling
1
Byte/
1
Bit
controlling
of
the
actuator
for
cooling
Chart
33:
Communication
objects
control
value
According
to
the
adjusted
controller
type
(4.5.1),
the
control
value
controls
a
heating
and/or
a
cooling
process.
If
the
control
value
is
chosen
as
PI
control
continuous,
the
communication
objects
will
have
the
size
of
1
Byte,
because
the
object
can
assume
several
states.
If
the
control
value
is
chosen
as
PI
control
switching
or
2
‐
step
control,
the
communication
object
will
have
the
size
of
1
Bit,
because
the
communication
object
can
only
assume
the
states
on
or
off.
