Mitsubishi MELSEC-Q series Programming Manual page 136

S.BPI
Specified position Symbol
+58
D2
GW
Loop tag
+59
*2
Memory +60
GG
+61
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
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) SV setting processing
Either of the following processings is performed depending on the operation mode (MODE) setting.
(a) When the operation mode (MODE) is any of CAS, CCB and CSV
1) When the set value (E2) is specified, engineering value conversion is performed with the following expression
and then "(2) Tracking processing" is performed.
RH RL
SV
n
100
2) When the set value (E2) is not specified, "(2) Tracking processing" is performed without the engineering value
conversion being performed.
(b) When the operation mode (MODE) is any of MAN, AUT, CMV, CMB, CAB, LCM, LCA and LCC, "(2) Tracking
processing" is performed.
134
Name
Recommended range
Gap width 0 to 100
Gap gain 0 to 999999
–– Used by the system as a work area.
Set value -10 to 110
+96 Control cycle counter initial preset flag
D2
*5
+97 Control cycle counter
+98
CT
DV
I
T
+99
I
E2 RL
*1
Unit Data format
Real
%
number
Real
––
number
–– ––
Real
%
number
Description
Standard Set
value by
0.0 U
1.0 U
–– S
0.0 U