Mitsubishi MELSEC-Q series Programming Manual page 85

Specified position Symbol
Loop tag
+124
D2
past value
––
memory
*2 *3
+127
*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
+124 Change rate monitor counter initial preset flag
D2
+125 Change rate monitor counter
+126
X
n-m
+127
When control is to be started from the initial status, the data must be cleared with the sequence program.
*4 The change rate monitor counter rounds off the data to the nearest whole number.
(2) Execution cycle ( T)
Set the execution cycle in SD1500 and SD1501 as real numbers.
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.
Condition
E1 > PH
Others
*1 When PHI or ERRI in the alarm detection inhibition (INH) is set to 1, PHA and BB2 show 0 since the alarm is prohibited.
Name
Recommended range
–– Used by the system as a work area.
Description
*4
BB2, PHA
*1
1
0
*1
Unit Data format
–– ––
S.BC
Standard Set
value by
1
–– S
2
3
4
4
6
7
8
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