Hitachi L300P User Manual
Page 144
Using Intelligent Input Terminals
Oper
ations
a
nd Moni
tor
ing
4–14
The Bit Operation method of speed control uses up to five intelligent inputs to select any of up
to six speeds from a total of eight speeds. (At least two of the SF1–SF7 functions will be
unused, since there are only five inputs.) Since the all-switches-OFF combination selects the
first speed, you only need N-1 switches to select N speeds. With Bit Operation speed control,
only one input is normally active at a time. If multiple switches are ON, the lower numbered
input takes precedence (determines the speed). The table and figure below show how the input
combinations work.
The following table lists the option codes for assigning [SF1 to [SF7] to the intelligent inputs.
0th
SF1
SF2
SF3
3rd
4th
2nd
5th
1st
Speed
Switches
Fwd Run
SF4
SF5
Note: Input functions SF6 and SF7 may be substituted
for any of SF1–SF5, to access Speed 7 or Speed 8.
Multi-
speed
Input Function
SF7
SF6
SF5
SF4
SF3
SF2
SF1
Speed 0
0
0
0
0
0
0
0
Speed 1
—
—
—
—
—
—
1
Speed 2
—
—
—
—
—
1
0
Speed 3
—
—
—
—
1
0
0
Speed 4
—
—
—
1
0
0
0
Speed 5
—
—
1
0
0
0
0
Speed 6
—
1
0
0
0
0
0
Speed 7
1
0
0
0
0
0
0
Opt.
Code
Symbol
Function Name
Description
32
SF1
Bit-level speed select 1
Bit-level speed select, Bit 0
33
SF2
Bit-level speed select 2
Bit-level speed select, Bit 1
34
SF3
Bit-level speed select 3
Bit-level speed select, Bit 2
35
SF4
Bit-level speed select 4
Bit-level speed select, Bit 3
36
SF5
Bit-level speed select 5
Bit-level speed select, Bit 4
37
SF6
Bit-level speed select 6
Bit-level speed select, Bit 5
38
SF7
Bit-level speed select 7
Bit-level speed select, Bit 6
Valid for
inputs:
C001, C002, C003, C004,
C005
Required
settings:
F001, A020 to A035
A019=00
Notes:
• When all [SFx] inputs are OFF, the speed is
set by default to the value in F001.
• When a multi-speed setting more than
50Hz(60Hz) is to be set, it is necessary to
program the maximum frequency A004 high
enough to allow that speed.
5
3
1
4
2
FW
TH
PLC
P24
CM1
SF2
SF1
SF4
SF3
SF5
Example (requires input configuration—
see page
See I/O specs
on page
.