Mitsubishi MELSEC-Q series Programming Manual page 142

S.R
Specified position Symbol
+52
D2
RMAX
+53
Loop tag
+54
RMIN
*2
memory +55
+56
R
n
+57
Loop tag
+96
D2
past value
––
*2
memory
+99
*3
+0
S3
*4
E2
Set value
+1
*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.
*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 The control cycle 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) Tracking processing
(a) When all of the following conditions hold, tracking processing is performed.
1) The tracking bit (TRK) of the operation constant is 1.
2) The set value (E2) is used.
3) The operation mode (MODE) is any of MAN, AUT, CMV, CMB, CAB, LCM, LCA and LCC.
100
E2 =
RMAX-RMIN
(b) When the set value (E2) is the manipulated value (MV) of the upper loop, the tracking flag (TRKF) of the alarm
detection inhibition (INH) in the upper loop turns to 1.
140
Name
Recommended range
Rate upper
-999999 to 999999
limit value
Rate lower
-999999 to 999999
limit value
Rate current
(-999999 to 999999)
value
–– Used by the system as a work area.
Set value -10 to 110
+96 Control cycle counter initial preset flag
*5
+97 Control cycle counter
+98
R (Last value)
n-1
+99
(SPR-RMIN)
*1
Unit Data format
Real
––
number
Real
––
number
Real
––
number
–– ––
Real
%
number
Description
Standard Set
value by
100.0 U
0.0 U
0.0 S
–– S
0.0 U