8.10.14 Configuring an "ONOFF" control function
This function is used to set the on/off control.
A conductivity control system can be combined with the "time dosing" function (see section 8.10.16) to carry out
a purging step (prebleed) before dosing.
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.
Setpoint (SP)
prebleed
ONOFF
fallback
position
"Time dosing"
function ("Dos. St.")
Process input
(PV)
result (Fx: CMD1)
System
switch
Fig. 60 : "ONOFF" function
1
13:40
1
0
0
29/06/2010
F2:ONOFF
250.0
µS/cm
PV
500.0
µS/cm
SP-PV:
0.00
%
CMD1
No Link
F3 Dos.St
Value of the process variable chosen
Value of the setpoint
Result of the ONOFF function
No associated time dosing
press this dynamic key to enter the setpoint value.
SP-PV:
MENU
Fig. 61 : Example of a view of an "ONOFF" function in Process level with no associated time dosing
95
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