54
Setting and Operation
Type 8745 Ethernet, 8745 Analogue
10.9 Choose the source giving the set-
point value (MFC)
The process set-point value can be set by different sources. You
can choose which source is active at a time. The source for the
set-point value can be changed during operation.
If you change the source for the set-point value, then the operating
mode of the MFC is changed.
To change the source for the set-point value, change the setting of
the parameter
set-point value source
with the Bürkert Communi
-
cator software. To connect the product to the Bürkert Communicator
software, refer to chpt. 10.4
On a product variant Ethernet you can alternatively change the
related object. Refer to the related procedure in the product-spe
-
cific help in the documentation of the initiation files. Download the
initiation files and the related documentation at
.
The setting of the parameter
set-point value source
is
kept after a restart, except when the product performs the
function
analyze system
.
The possible choices for the parameter
set-point value source
are:
•
Product variant Ethernet:
automatic
:
the set-point value is set
via the fieldbus.
•
Product variant Analogue:
analog set-point value
:
the set-
point value is set via the analogue input.
•
manual set-point value
: to manually give in a set-point value
for testing purposes or to make sure that the set-point value is not
overwritten by other fieldbus participants.
•
stored set-point value
:
to use a fixed set-point value (w). If
the product is restarted, then the fixed set-point value remains
active.
•
Open-loop control mode
:
to directly set the set-point position
(y) to the control valve. The value given in the menu
actuator
parameter
actuating variable
is the set-
point position (y) that is used. A restart of the product sets the
set-point position (y) to zero.
•
analyze system
: the product operates in the normal operating
mode, but according to a predefined chronological sequence
with set-point values. Use the resulting diagram in combination
with the graphical representation of process values to analyse
the system with the Bürkert Communicator software.
10.10 Set-point values without
communication (MFC Ethernet)
The function makes it possible to specify the set-point values of
an MFC even if the communication with the external set-point
value provider (for example a PLC) is broken. If the function is
used, then the set-point is kept constant.
By using the function, the fluid can continue to flow even
if the communication is broken.
▶
Make sure that the process is safe when you use
the
function.
→
To use the function, refer to the related procedure in the prod
-
uct-specific help in the documentation of the initiation files.
English
Содержание 8745 MFC Ethernet
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