FX Series Programmable Controllers Basic Program Instructions 2
2-8
2.8 Load Pulse, Load Trailing Pulse
Pro
ram example:
Basic points to remember:
- Connect the LDP and LDF instructions directl
to the left hand bus bar.
- Or use LDP and LDF instructions to define a new block of pro
ram when usin
the ORB
and ANB instructions (see later sections).
- LDP is active for one pro
ram scan after the associated device switches from OFF to ON.
- LDF is active for one pro
ram scan after the associated device switches from ON to
OFF.
Mnemonic Function Format Devices Program steps
LDP
(LoaDPulse)
Initial lo
ical
operation -
Risin
ed
e
pulse
X, Y, M, S, T, C 2
LDF
(LoaD Fallin
pulse)
Initial lo
ical
operation Fallin
/ trailin
ed
e
pulse
X, Y, M, S, T, C 2
LDF
LDP
X0
Y0
M100
X1
X0
0LDP X 0
2OR X 1
3 OUT M 100
4LDF X 0
6 OUT Y 0
Single Operation flags M2800 to M3071:
• The pulse operation instructions, when used with auxiliar
rela
s M2800 to M3071,
onl
activate the first instruction encountered in the pro
ram scan, after the point in
the pro
ram where the device chan
es. An
other pulse operation instructions will
remain inactive.
• This is useful for use in STL pro
rams (see chapter 3) to perform sin
le step
operation usin
a sin
le device.
•An
other instructions (LD, AND, OR, etc.) will operate as expected.
For more details please see pa
e 4-5.
