Mitsubishi Electric MELSEC iQ-R Series - Page 1244

1242
11 PROCESS CONTROL INSTRUCTIONS
11.3 Control Operation Instructions
■Loop tag past value memory
The system uses this area as a work area.
To start the control from the initial status, clear data by using a sequence program.
The loop tag past value memory occupies 32 words after the loop tag memory.
+64
+65
 Two-degree-
offreedom
parameter 
0 to 1
Increasing  decreases the manipulated value variation relative
to the set value change. (It will take time to stabilize.)
Decreasing  increases the manipulated value variation relative
to the set value change. However, it strengthens the
compensation operation and accordingly makes hunting greater.
Single-precision
real number
0.0 User
+66
+67
 Two-degree-
offreedom
parameter 
0 to 1
Increasing  decreases the effect of derivative control on the set
value change.
Decreasing  increases the effect of derivative control on the set
value change.
Single-precision
real number
1.0 User
Operand: (d2)
Position Symbol Name Recommended range Data type Standard
value
Set by
+96  Control cycle
counter
initialization
completion flag
System
+97 Control cycle
counter (The
value is rounded
off to the nearest
whole number.)
+102
+103
B
n-1
Last value
+104
+105
PV
n
Process value
+106
+107
PV
n-1
Last process
value
+108
+109
PV
n-2
Last-but-one
process value
+110
+111
DV
n-1
Last deviation
value
+112
+113
DV
n-2
Last but one
deviation value
+114
+115
D
n-1
Last value
+116 ALM2 Alarm detection
2
MHA2, MLA2
0: No alarm
1: Alarm
Operand: (d2)
Position Symbol Name Recommended range Data type Standard
value
Set by
b15 b0b1b2
MHA2 MLA2
...