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Device
Data name
(s)+16
Alarm
(s)+17
PID control work area
(reserved by the system)
(s)+32
I/O data area for No. 2 loop (device: (s)+28 to (s)+45)
(s)+33
Setting
value
(s)+34
Process
value
(s)+35
Automatic
manipulated
value
(s)+36
Process
value after
filtering
(s)+37
Manual
manipulated
value
(s)+38
Manual/
automatic
selection
(s)+39
Alarm
(s)+40
PID control work area
(reserved by the system)
(s)+55
I/O data area for No. n loop
(s)+(m+0)
Setting
value
(s)+(m+1)
Process
value
(s)+(m+2)
Automatic
manipulated
value
(s)+(m+3)
Process
value after
filtering
(s)+(m+4)
Manual
manipulated
value
(s)+(m+5)
Manual/
automatic
selection
(s)+(m+6)
Alarm
(s)+(m+7)
PID control work area
(reserved by the system)
(s)+(m+22)
*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)
6 PID CONTROL INSTRUCTION
234
6.1 PID Control Instruction (Inexact Differential)
Description
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.
SV
The same as I/O data area for No. 1 loop
PV
MV
PVf
MV
MAN
MAN/
AUTO
ALARM
SV
The same as I/O data area for No. 1 loop
m=(n-1) 23+10
n: number of loops
PV
MV
PVf
MV
MAN
MAN/
AUTO
ALARM
Setting range
With PID limits
Without PID
limits
...
b15
b1 b0
0
(2)
(1)
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'.
Setting
Processing when the
side
setting data are outside
the setting range
User
System
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