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6 PID CONTROL INSTRUCTION
6.1 PID Control Instruction (Inexact Differential)
*1 For process value after filtering (PVf), the value calculated based on the process value of input data are stored.
For the operational expression, refer to the following.
MELSEC-Q/L/QnA Programming Manual (PID Control Instructions)
(s)+16
Alarm
ALARM
• Used to determine if the
change rate of the MV
(manipulated value) and
the PV (process value) is
within or outside the limit
value range.
• Once set, the alarm data
are maintained until the
user resets it.
When the MV variation is outside the limit
range, bit 1 (b1) is set to '1'.
When the PV variation is outside the limit
range, bit 0 (b0) is set to '1'.
User
System
(s)+17
(s)+32
PID control work area
(reserved by the system)
I/O data area for No. 2 loop (device: (s)+28 to (s)+45)
(s)+33
Setting
value
SV
The same as I/O data area for No. 1 loop
(s)+34
Process
value
PV
(s)+35
Automatic
manipulated
value
MV
(s)+36
Process
value after
filtering
PVf
(s)+37
Manual
manipulated
value
MV
MAN
(s)+38
Manual/
automatic
selection
MAN/
AUTO
(s)+39
Alarm
ALARM
(s)+40
(s)+55
PID control work area
(reserved by the system)
I/O data area for No. n loop
(s)+(m+0)
Setting
value
SV
The same as I/O data area for No. 1 loop
m=(n-1)
23+10
n: number of loops
(s)+(m+1)
Process
value
PV
(s)+(m+2)
Automatic
manipulated
value
MV
(s)+(m+3)
Process
value after
filtering
PVf
(s)+(m+4)
Manual
manipulated
value
MV
MAN
(s)+(m+5)
Manual/
automatic
selection
MAN/
AUTO
(s)+(m+6)
Alarm
ALARM
(s)+(m+7)
(s)+(m+22)
PID control work area
(reserved by the system)
Device
Data name
Description
Setting range
Setting
side
Processing when the
setting data are outside
the setting range
With PID limits
Without PID
limits
…
b15
0
(2)
b1 b0
(1)
Содержание MELSEC System Q
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