Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 1244

Operand: (d2)
Position Symbol

+64
+65

+66
+67
■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.
Operand: (d2)
Position Symbol
+96 
+97
+102 B
n-1
+103
+104 PV
n
+105
+106 PV
n-1
+107
+108 PV
n-2
+109
+110 DV
n-1
+111
+112 DV
n-2
+113
+114 D
n-1
+115
+116 ALM2
11 PROCESS CONTROL INSTRUCTIONS
1242
11.3 Control Operation Instructions
Name Recommended range
Two-degree- 0 to 1
Increasing  decreases the manipulated value variation relative
offreedom
parameter 
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.
Two-degree- 0 to 1
Increasing  decreases the effect of derivative control on the set
offreedom
parameter 
value change.
Decreasing  increases the effect of derivative control on the set
value change.
Name Recommended range
Control cycle 
counter
initialization
completion flag
Control cycle
counter (The
value is rounded
off to the nearest
whole number.)
Last value
Process value
Last process
value
Last-but-one
process value
Last deviation
value
Last but one
deviation value
Last value
Alarm detection
b15
2
MHA2, MLA2
0: No alarm
1: Alarm
...
b2 b1 b0
Data type Standard Set by
value
Single-precision 0.0 User
real number
Single-precision 1.0 User
real number
Data type Standard Set by
value
  System