Mitsubishi Electric MELSEC iQ-R Series, Programming Manual

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11 PROCESS CONTROL INSTRUCTIONS
11.3 Control Operation Instructions
■
Block memory
■
Operation constant
■ Execution cycle (

T)
Set the execution cycle (

T) in SD816 and SD817 in single-precision real number.
Processing details
This instruction limits the varying speed and outputs it (BW) when the variation rate of input (E1) exceeds the limit.
The S.VLIMT1 instruction performs the following operations.
Operand: (d1)
Device Symbol Name Recommended range Data type Standard
value Set by
+0
+1 BW Output value -999999 to 999999 [%] Single-precision
real number  System
+2 BB BB1 Positive
direction limit
alarm
0: No alarm
1: Alarm
16-bit unsigned
binary  System
BB2 Negative
direction limit
alarm
Operand: (s2)
Device Symbol Name Recommended range Data type Standard
value Set by
+0
+1 V1 Positive
direction limit
value 0 to 999999 [%/s] Single-precision
real number 100.0 User
+2
+3 V2 Negative
direction limit
value 0 to 999999 [%/s] Single-precision
real number 100.0 User
+4
+5 HS1 Positive
direction
hysteresis 0 to 999999 [%] Single-precision
real number 0.0 User
+6
+7 HS2 Negative
direction
hysteresis 0 to 999999 [%] Single-precision
real number 0.0 User
Pd: Positive direction
Nd: Negative direction
Condition Input (E1-BW) BW BB1 BB2
Positive direction E1

BW (E1-BW)

(V1

T) BW=BW+V1

T 1 0
(E1-BW)<(V1

T-HS1) BW=E1 0 0
Others BW=E1 Last value Last value
Negative direction E1<BW (BW-E1)

(V2

T) BW=BW-V2

T 0 1
(BW-E1)<(V2

T-HS2) BW=E1 0 0
Others BW=E1 Last value Last value
b15 b1 b0
...
BB1 BB2
1
0
t
BB1
BW
t
BB2
BW
1
0
t t
E1 E1
BW BW
Pd Nd