Bcnt (Bit Count) - IDEC FC4A-C10R2 User Manual

BCNT (Bit Count)

BCNT
*****
Applicable CPU Modules
FC4A-C10R2/C FC4A-C16R2/C
—
Valid Operands
Operand
S1 (Source 1)
S2 (Source 2)
D1 (Destination 1)
For the valid operand number range, see pages 6-1 and 6-2.
▲
Internal relays M0 through M1277 can be designated as D1. Special internal relays cannot be designated as D1.
When T (timer) or C (counter) is used as S2, the timer/counter current value is read out. When T (timer) or C (counter) is
used as D1, the data is written in as a preset value which can be 0 through 65535.
Valid values for S2 to designate the quantity of bits searched are 1 through 256. Make sure that the search area designated
by S1 plus S2 is within the valid value range. If the source data is out of the valid range, a user program execution error
will result, turning on special internal relay M8004 and the ERR LED.
Since the BCNT instruction is executed in each scan while input is on, a pulse input from a SOTU or SOTD instruction
should be used as required.
Examples: BCNT
BCNT
M4
I0
M17
M37
M57
M77
M97
M117
BNCT
D10
I1
Bit 15 14 13 12 11 10
D10
D11
D12
D13
D14
D15
S1 S2 D1
***** *****
FC4A-C24R2/C
— —
Function
First bit to start search
Quantity of bits searched
Destination to store quantity of ON bits
S1 S2 D1
64 D100
S1 S2 D1
60 D100
9 8 7 6 5
« FC4A M
When input is on, bits which are on are sought in an array of consecu-
tive bits starting at the point designated by source operand S1. Source
operand S2 designates the quantity of bits searched. The quantity of
bits which are on is stored to the destination designated by operand D1.
FC4A-D20K3/S3
—
I
X
X
—
When input is on, bits which are on are sought in an array of 64 bits
starting at internal relay M4 designated by source operand S1.
Since 3 bits are on in the searched area, the quantity is stored to data
register D100 designated by destination operand D1.
M0
M20
M40
M60
M80
M100
When input I0 is on, bits which are on are sought in 60 bits starting
at bit 0 of data register D10 designated by operand S1.
Since 2 bits are on among the 60 bits, 2 is stored to data register
D100 designated by operand D1.
4 3 2 1 0
S U ' M
ICRO MART SER S ANUAL
14: D C
ATA ONVERSION
FC4A-D20RK1/RS1 & FC4A-D40K3/S3
X
Q M R T C D
X X X — — X
X X X X X X
▲
X X X X X
D100
2
D100
ON
Searched area
»
I
NSTRUCTIONS
Constant Repeat
— —
1-256 —
— —
3
ON
Searched area
14-13