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6 PID CONTROL INSTRUCTION
6.1 PID Control Instruction (Inexact Differential)
229
6
(s)+10
MV change rate
limit (
MVL)
Set the variation limit
between the previous MV
and the present MV.
When the MV variation is
greater than the limit value,
bit 1 (b1) of the alarm device
is set to '1'.
MV variation is not limited.
(Even if the MV variation
exceeds the limit value, the
actual MV variation is used
as it is for calculating the
MV.)
0 to 2000
-32768 to 32767
User
In the case of "With PID
limits", the PID operation is
performed after values are
replaced as follows:
• If the
MVL value is less
than 0, the value is clipped
to 0.
• If the
MVL value is
greater than 2000, the
value is clipped to 2000.
(s)+11
PV change rate
limit (
PVL)
Set the variation limit
between the previous PV and
the present PV.
When the PV variation is
greater than the limit value,
bit 0 (b0) of the alarm device
is set to '1'.
PV variation is not limited.
(Even if the PV variation
exceeds the limit value, the
actual PV variation is used as
it is for performing the PID
operation.)
0 to 2000
-32768 to 32767
User
In the case of "With PID
limits", the PID operation is
performed after values are
replaced as follows:
• If the
PVL value is less
than 0, the value is clipped
to 0.
• If the
PVL value is greater
than 2000, the value is
clipped to 2000.
(s)+12
(Fixed value)
0
0
User
(s)+13
Derivative gain
(K
D
)
Set a duration (delay in
action) for derivative action.
As the setting value
increases, the duration
becomes smaller and action
becomes closer to exact
differential.
Ideal value K
D
= 8.00
0 to 32767
(unit: 0.01)
If setting value
> 30000
K
D
= Infinite (
)
0 to 32767
(unit: 0.01)
If setting value
> 30000
K
D
= Infinite (
)
User
An error occurs and the PID
operation for the
corresponding loop is not
performed.
(s)+14
(Fixed value)
0
0
User
(s)+15
(Fixed value)
0
0
User
Setting data for No. 2 loop (device: (s)+16 to (s)+29)
Device
Data item
Description
Setting range
Setting
side
Processing when the
setting data are outside
the setting range
With PID limits
Without PID
limits
Содержание MELSEC System Q
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