Mitsubishi Electric MELSEC iQ-R Series - Page 1281

11 PROCESS CONTROL INSTRUCTIONS
11.3 Control Operation Instructions
1279
11
■Set value
The set value (E2) is valid only when b0 of the set value pattern (SVPTN) is set to 0 (Used). To use the upper loop MV as the
set value (E2), specify the device (offset +12) where the manipulated value (MV) of the upper loop is set.
If E2 is not used, specify a dummy device (SD820).
■Execution cycle (T)
Set the execution cycle (T) in SD816 and SD817 in single-precision real number.
Processing details
This instruction performs ratio calculation when the specified control cycle is reached.
At this time, the instruction also performs the following steps: control mode (MODE) determination, engineering value
transformation, tracking, and variation rate limiter.
SPR: Set value, R
n
: Current ratio value, DR: Variation rate limit value, Cy: Control cycle
The following is the processing block diagram of the S.R instruction. (The numbers (1) to (6) in the diagram indicate the order
of the processing.)
Operand: (s3)
Position Symbol Name Recommended range Data type Standard
value
Set by
+0
+1
E2 Set value -10 to 110 [%] Single-precision
real number
0.0 User
t
1
t
0
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
t
10
t
11
t
12
DR
SPR
R
n
SPR
R
n
Cy
E2
BW
MAN
MODE
SPA
CT
E1
(1)
(2)
(3)
(4)
(5)
(4)
(6)
(6)
Loop stop
processing
RUN (SPA=0)
STOP (SPA=1)
Control
cycle
determination
Tracking
(When used)
Reached
Not reached
Engineering
value
conversion
Variation
rate limiter
Ratio
calculation
Mode
determination
Other than CAS, CCB, CSV
CAS, CCB, CSV
BW=Last value
Loop
stop
determination
RMIN, RMAX
DR
Rn BIAS