User`s manual

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MELSEC-Q
9 CONTROL OPERATION INSTRUCTIONS
Specified position Symbol Name Recommended range
*1
Unit Data format
Standard
value
Store
D2
+60
+61
GG Gap gain 0 to 999999
Real
number
1.0 U
+62
+63
MVP
MV inside
operation
value
(-999999 to 999999) %
Real
number
0.0 S
+64
+65
2 degree-of-
freedom
parameter
*5
0 to 1
Real
number
0.0 U
Loop tag
memory
*2
+66
+67
2 degree-of-
freedom
parameter
*6
0 to 1
Real
number
1.0 U
+96
Loop tag
past value
memory
*2 *3
+115
Used by the system as a work area. S
Set value
*4
S3
+0
+1
E2 Set value -10 to 110 %
Real
number
0.0 U
*1: The data of the item(s) where the values within the recommended range are given in the parentheses are stored by the system.
Users cannot set the data.
*2: The loop tag memory and loop tag past value memory occupy a total of 128 words. (Refer to Section 3.3.1 for details.)
*3: The applications of the loop tag past value memory are indicated below.
Specified position Description
D2
+96 Control cycle counter initial preset flag
+97 Control cycle counter
+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
(Process value before last)
+110
+111
DV
n-1
(Last deviation value)
+112
+113
DV
n-2
(Deviation value before last)
+114
+115
D
n-1
(Last value)
When control is to be started from the initial status, the data must be cleared with the sequence program.
*4: The set value (E2) becomes valid when the set value pattern (SVPTN) is set to "E2 is used".
When using the MV of the upper loop as the set value (E2), specify the device where the manipulated value (MV) of the upper loop is set
(offset + 12: MV).
When not using E2 as the set value, make sure to specify a dummy device.
(Special register SD1506 can be specified as a dummy device.)
*5: 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, since a compensation operation will be stronger, hunting may become greater.
*6: Increasing
decreases the effect of differentiation on the set value change.
Decreasing
increases the effect of differentiation on the set value change.
(2) Execution cycle ( T)
Set the execution cycle in SD1500 and SD1501 as real numbers.