Omron RX User Manual page 137

PID Operation
P Operation
•Operation where the control volume is proportional to the target value
Target value
Control volume
I Operation
•Operation where the control volume increases linearly according to time
Target value
Control volume
D Operation
•Operation where the control volume is proportional to the variation ratio of the target value
Target value
Control volume
•PI operation is the combination of the above P and I operations; PD is P and D operations; PID is
P, I and D operations.
Feedback Selection
•Select a terminal used for feedback signals in PID feedback selection A076.
•The target value depends on the terminal selected in frequency reference selection A001 other
than that in A076.
When A001 is set to "01" (terminal), the setting of O/OI selection A005 is disabled.
•When analog input is selected for PID feedback and A001 is set to "01" (terminal), the PID target
value is selected depending on the A006 set value, as shown in the following table.
PID feedback selection (A076)
00 (OI-L)
01 (O-L)
OI included in operands
10 O included in operands
(operation result)
OI and O are the
operands
•To select RS485 for PID feedback, transfer data as described below.
Step transition
Ramp transition
Large
A072
Small
Small
A073
Large
Large
A074
Small
A006 = 00 A006 = 01
O + O2 (Not reversible)
OI + O2 (Not reversible)
O + O2 (Not reversible)
OI + O2 (Not reversible)
4-2 Function Mode
Large
A072
Small
Small
A073
Large
Large
A074
Small
PID target value
A006 = 02
O + O2 (Reversible)
OI + O2 (Reversible)
O + O2 (Reversible)
OI + O2 (Reversible)
O2 (Reversible)
4
A006 = 03
O
OI
O
OI
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