Mitsubishi MELSEC-Q series Programming Manual page 90

S.PSUM
Specified position Symbol
Loop tag
past value
+116
D2
––
memory
+117
*2 *3
*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 Page 27, Section 3.3.1 for
details.)
*3 The applications of the loop tag past value memory are indicated below.
Specified position
D2
When control is to be started from the initial status, the data must be cleared with the sequence program.
Set Data
Processing contents
(1) Upper limit check processing
In the upper limit check processing, the following operation is performed and the result of the operation is output to BB2
and PHA.
e1 e2
0 0
0 1
1 0
1 1
(2) Integrated value operation processing
In the integrated value operation processing, the following processing is performed for the input value increment (T1).
e1 e2
0 0
0 1
1 0
1 1
*1 At an integration stop/reset (e1 = 0), processing is performed on the assumption that integration hold is canceled (e2 = 0).
88
Name
Recommended range
–– Used by the system as a work area.
+116
E1 (Last input value)
n-1
+117
Input value increment (T1)
––
––
E1 - E1
n-1
––
Integration value (Integer part) (T2), Integration value (Fraction part) (T3)
T2 = 0
T3 = 0
T2 = 0
*1
T3 = 0
T4 = quotient of {(T1 × W) / U} <integer part>
T5 = remainder of {(T1 × W) / U} <fraction part>
T2 = SUM1 + T4 + [quotient of {(SUM2 + T5) / U}] <integer part>
T3 = remainder of {(SUM2 + T5) / U} <fraction part>
T2 = SUM1
T3 = SUM2
Data
*1
Unit
format
–– ––
Description
Standard Set
value by
–– S