User`s manual

9 - 51 9 - 51
MELSEC-Q
9 CONTROL OPERATION INSTRUCTIONS
Specified position Symbol Name Recommended range
*1
Unit Data format
Standard
value
Store
D2
+52
+53
RMAX
Rate upper
limit value
-999999 to 999999
Real
number
100.0 U
+54
+55
RMIN
Rate lower
limit value
-999999 to 999999
Real
number
0.0 U
Loop tag
memory
*2
+56
+57
R
n
Rate current
value
(-999999 to 999999)
Real
number
0.0 S
D2
+96
Loop tag
past value
memory
*2 *3
+99
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
+98
+99
R
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.)
(2) Execution cycle ( T)
Set the execution cycle in SD1500 and SD1501 as real numbers.
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
(SPR
RMIN)
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.