6 PID CONTROL INSTRUCTION
6.2 PID Control Instruction (Exact Differential)
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6
*1 For the PID operational expression set in the operational expression selection, refer to the following.
MELSEC-Q/L/QnA Programming Manual (PID Control Instructions)
Precautions
The following table shows the CPU modules applicable to the PID control instructions (inexact differential) and the PID control
instructions (exact differential).
: Applicable,
: Not applicable
(s)+9
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 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.
CPU module model
Inexact differential
Exact differential
Basic model QCPU
The first five digits of the serial number are '04121' or lower.
The first five digits of the serial number are '04122' or higher
High Performance model
QCPU
The first five digits of the serial number are '05031' or lower.
The first five digits of the serial number are '05032' or higher.
Redundant CPU
Universal model QCPU
LCPU
Device
Data item
Description
Setting range
Setting
side
Processing when the
setting data are outside
the setting range
With PID limits
Without PID
limits
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