Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 1281

■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).
Operand: (s3)
Position Symbol Name
+0 E2 Set value
+1
■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
R
n
t t t t t
0 1 2 3 4
SPR: Set value, R : Current ratio value, DR: Variation rate limit value, Cy: Control cycle
n
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.)
E1
(6)
E2
(When used)
CT
RUN (SPA=0)
(4)
Loop
stop
determination
SPA
MODE
Recommended range
-10 to 110 [%]
DR
t t t t t t
5 6 7 8 9 10
RMIN, RMAX
(1)
Engineering
value
Tracking
conversion
Other than CAS, CCB, CSV
CAS, CCB, CSV
(5)
Control
cycle
determination
STOP (SPA=1)
(4)
Loop stop
MAN processing
SPR
R
n
Cy
t t
11 12
Rn
DR
(2)
Variation
rate limiter
(6)
Reached
Mode
determination
Not reached
BW=Last value
11 PROCESS CONTROL INSTRUCTIONS
11.3 Control Operation Instructions
Data type Standard Set by
value
Single-precision 0.0 User
real number
BIAS
(3)
Ratio
calculation
11
BW
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