IDEC MICROSmart FC6A Series Ladder Programming Manual

FC6A S ERIES MICROS MART L ADDER P ROGRAMMING M ANUAL FC9Y-B1726 9-1
9: SHIFT / ROTATE INSTRUCTIONS
Introduction
Bit shift instructions are used to shift the data string starting with source device S1 to the left or right by 1 to 15 bits as designated.
The data string can be 1 to 65,535 bits. The result is set to the source device S1 and special internal relay M8003 (carry or
borrow). The LSB or MSB is filled with 0 or 1 as designated.
Bit shift and rotate instructions are used to shift the 16- or 32-bit data string in the designated source device S1 to the left or right
by the quantity of bits designated. The result is set to the source device S1 and special internal relay M8003 (carry or borrow).
The BCD left shift instruction shifts the BCD digits in two consecutive data registers to the left.
The word shift instruction is used to move 16-bit data to a destination data register and shifts down the data of subsequent data
registers as many as designated.
SFTL (Shift Left)
Valid Devices
For valid device address ranges, see "Device Addresses" on page 2-1.
Special internal relays cannot be designated as S1.
Since the SFTL instruction is executed in each scan while input is on, a pulse input from a SOTU or SOTD instruction should be used.
CY ← S1
When input is on, N_B-bit data string starting with source device S1 is shifted
to the left by the quantity of bits assigned by device Bits.
The result is set to source device S1, and the last bit status shifted out is set to
special internal relay M8003 (carry or borrow). Zero or 1 assigned by source
device S2 is set to the LSB.
S1
*****
Bits
**
SFTL S2
*****
N_B
*****
0Before shift: 1 0 1010 1 0 1 1 1101 0 0
CY
M8003
MSB LSB
S1
1After shift: 00 1010 1 0 1 1 1101 0 0
CY
M8003
MSB LSB
S1
Shift to the left
• S2 = 0, N_B = 16, Bits = 1
S2
Device Function I Q M R T C D P Constant Repeat
S1 (Source 1) First data for bit shift — X X — — X — — —
S2 (Source 2) Data to shift into the LSB X X X X — — — — 0 or 1 —
N_B Number of bits in the data string — — — — — — X — 1-65,535 —
Bits Quantity of bits to shift — — — — — — X — 1-15 —

IDEC MICROSmart FC6A Series Specifications

General

Brand	IDEC
Model	MICROSmart FC6A Series
Category	Computer Hardware
Language	English