168
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
7 Basic Instruction
7.5 LDP, LDF, ANDP, ANDF, ORP, ORF
2. LDF, ANDF, and ORF instructions (initial logical operation of falling/trailing edge pulse,
serial connection of falling/trailing edge pulse, and parallel connection of falling/trailing
edge pulse)
In the example shown above, M0 or M1 is ON during only one operation cycle when X000 to X002 turn OFF
from ON.
3. Bit specification of a data register (D)
A bit in data register (D) can be specified as a device used in LDP, LDF, ANDP, ANDF, ORP and ORF
instructions.
When specifying a bit in data register, input "."
after a data register (D) number, and then
input a bit number (0 to F) consecutively.
Only 16-bit data registers are available.
Specify a bit number as "0, 1, 2, ... 9, A, B, ...
F" from the least significant bit.
Example: In the example shown on the left,
LDP contact turns ON (becomes
conductive) or OFF (becomes non-
conductive) when the bit 3 of D0
turns ON or OFF.
X000
X001
M0
M8000
X002
M1
RUN monitor
0000 LDF
X000
0002 ORF
X001
0004 OUT
M0
0005 LD
M8000
0006 ANDF X002
0008 OUT
M1
ON
ON
ON
ON
Timing chart
ORF instruction
LDF instruction
X000
M0
X001
ON
ON during
one opera-
tion cycle
M8000
ANDF instruction
M1
X002
ON
ON
ON
ON during
one opera-
tion cycle
Circuit program
List program
LDF instruction
ORF instruction
ANDF instruction
D0.3
Y000
Circuit program
List program
LDP
OUT
0000
0001
D0.3
Y000