Bürkert 8619 multiCELL WM AC, Operating Instructions Manual

Page: 98 / 194

CMD SAFE : Confirm (select "Mode: ON") or do not confirm (select "Mode:OFF") the use of a fallback position
on the output when the "System switch" event (see section 8.10.7) has the state "ON". When use of the fallback
position is confirmed, enter a fallback position value of between 0 and 100% for each output.
1
13:40
1
0
0
press this dynamic key to enter
the setpoint value.
F2:ONOFF
250.0
µS/cm
PV
500.0
µS/cm
SP-PV:
0.00
%
CMD1
Off F3 Dos.St
Measured value of the process variable chosen
Value of the standard setpoint
result of the ONOFF function
Associated Time dosing; dosing status is "Off".
See Fig. 63 : Combination of "ONOFF" and "TIME DOSING" functions on a con-
ductivity measurement for the various states of a dosing operation
SP-PV: MENU
29/06/2010
MANUAL
Fig. 64 : Example of a view, in Process level, of the ONOFF function associated with a time dosing function
8.10.15 Configuring a PID (proportional integral derivative) control
function
This function is available as an option. See section 8.10.4.
Only up to 6 PID functions can be active simultaneously (see section 8.8)
Setpoint
(internal or
external)
(SP)
Process
input
(PV)
Splimit
Cutoff
PID function
A single
channel
Two channels
Direction of the
actuator
Demarcation of
the result
Fallback
position
PID function
Direction of the
actuator
Demarcation of
the result
Fallback
position
system
switch
result
(Fx:PID1)
result
(Fx:PID2)
Fig. 65 : PID function
Once the function has been configured and activated, the result "Fx:" calculated is available in the list of
process variables on the "M0:MAIN" board. This list appears in the output configuring, user view config-
uring and datalogging menus to:
• Assign the result "Fx:" calculated to a physical output (analogue, AO, or digital, DO) (see sec-
tions 8.10.22 and 8.10.23).
• Display the result "Fx:" on one of the user defined "Ux" views: see section 8.10.8.
• Logging the values of "Fx:" using the datalogger: see section 8.10.19.
98
Adjustmentandcommissioning
Type 8619
English