CD600 Plus - User's Manual
4.18
Fig 4.9.1 - PI Sampling
ACTION (CACT)
There are processes that require the output signal to increase when the Process Variable increases,
hile others require the other way around. w
Parameter CACT selects the type of action:
TYPE 0, 2, 4 or 6 - Output signal decreases when PV increases
eS
P
=−
()
YPE 1, 3, 5 or 7 - Output signal ncreases when PV increases. T
eS
=−
()
P
In order to standardize operation, it is recommended to consider that an output signal equal to 100%
means valve open and that an output signal equal to 0% means valve closed. Operation of the front
s follows the same principle: panel key
OPENS THE VALVE
CLOSES THE VALVE
100%
0%
0
C
According to this procedure MV=100% means always valve open and MV=0% means always valve
closed.
If the actuated valve is "Air-to-open", MV=100% must be equivalent to 20 mA. Valves type Air-to-
close will require 100% being equivalent to 4 mA. This may be selected in Function 02 - Current
Output.
uning by the Front Panel T
Parameter CACT also defines if the block allows changes on the tuning parameters through the
PID constants ahead). front panel push buttons or not (see
ront panel adjustment is selected when CACT=0, 1, 4 or 5. F
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