User`s manual

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MELSEC-Q
8 I/O CONTROL INSTRUCTIONS
Specified position Symbol Name Recommended range
*1
Unit Data format
Standard
value
Store
D2
+18
+19
MH
Output upper
limit value
-10 to 110 %
Real
number
100.0 U
+20
+21
ML
Output lower
limit value
-10 to 110 %
Real
number
0.0 U
+48
+49
DML
Output change
rate limit value
0 to 100 %
Real
number
100.0 U
+54
+55
I
Integral
constant
0 to 999999 s
Real
number
10.0 U
+62
+63
MVP
MV inside
operation
value
(-999999 to 999999) %
Real
number
0.0 S
Loop tag
memory
*2
+68
+69
CTDUTY
Control output
cycle
0 to 999999 Note that
32767
CTDUTY
T
s
Real
number
1.0 U
D2
+118Loop tag
past value
memory
*2 *3
+121
Used by the system as a work area. S
*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
+118 Control output cycle counter initial preset flag
+119 Control output cycle counter
+120 Output counter
+121 Output ON counter
When control is to be started from the initial status, the data must be cleared with the sequence program.
(2) Execution cycle ( T)
Set the execution cycle in SD1500 and SD1501 as real numbers.