YOKOGAWA F3CU04-0S User Manual

C6-1
IM 34M06H62-02E 2nd Edition : June 2008-00
C6. Control and Computation Function
C6.1 Forward Operation and Reverse Operation
Forward operation or reverse operation defines the direction of change (increase or
decrease) of the control output value corresponding to a positive difference between the
CSP and PV. (Switching between forward operation and reverse operation is, however,
not available in Heating/Cooling Control mode.)
You can switch between forward operation and reverse operation even in Run mode.
In reverse operation (default factory setting), the control output value is decreased if PV
is larger than CSP, and is increased if PV is smaller than CSP (see Figure C6.1 below).
Relation between PV and CSP
On/Off Output
Continuous Output
Time Proportional Output
Direction of Output
Change
PV > CSP
OFF
Current decreases
On-time decreases
Reverse Operation
Forward Operation
CSP
Output value
Increases
Decreases
Minimum
(Low PV)
Maximum
(High PV)
0%
PV
100%
ON
Current increases
On-time increases
ON
Current increases
On-time increases
OFF
Current decreases
On-time reduces


Output value
Increases
Decreases
PV < CSP
PV > CSP PV < CSP
CSP
Minimum
(Low PV)
Maximum
(High PV)
0%
100%
Control output value=(PV-CSP)+50%
Control output value=(CSP-PV)+50%
PV
Reverse Operation
Forward Operation


Figure C6.1 Output Directions in Forward Operation and Reverse Operation
Table C6.1 Parameters Related to Forward Operation and Reverse Operation
Data Position Number
Symbol Description Unit
Data Range
Default
Value
Attribute
Stored
Loop1 Loop2 Loop3 Loop4
213 413 613 813 1.DR
Forward/reverse
switch
None
0: Reverse operation;
1: Forward operation
(Always 0 in heating/cooling control)
0 RW 
233 433 633 833 2.DR
Forward/reverse
switch
None
0: Reverse operation;
1: Forward operation
(Always 0 in heating/cooling control)
0 RW 
253 453 653 853 3.DR
Forward/reverse
switch
None
0: Reverse operation;
1: Forward operation
(Always 0 in heating/cooling control)
0 RW 
273 473 673 873 4.DR
Forward/reverse
switch
None
0: Reverse operation;
1: Forward operation
(Always 0 in heating/cooling control)
0 RW 

YOKOGAWA F3CU04-0S Specifications

General

Brand	YOKOGAWA
Model	F3CU04-0S
Category	Control Unit
Language	English