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FX Series Programmable Controllers

2-8

Program example:

Basic points to remember:

-

Connect the LDP and LDF instructions directly to the left hand bus bar.

-

Or use LDP and LDF instructions to define a new block of program when using the ORB
and ANB instructions (see later sections).

-

LDP is active for one program scan after the associated device switches from OFF to ON.

-

LDF is active for one program scan after the associated device switches from ON to
OFF.

LDP
(LoaDPulse)

Initial logical 
operation - 
Rising edge 
pulse

X, Y, M, S, T, C

2

LDF
(LoaD Falling 
pulse)

Initial logical 
operation Falling 
/ trailing edge 
pulse

X, Y, M, S, T, C

2

FX

1S

FX

1N

FX

2N

FX

2NC

LDF

LDP

X0

Y0

M100

X1

X0

0

LDP

X

0

2

OR

X

1

3

OUT

M 100

4

LDF

X

0

6

OUT

Y

0

•

The pulse operation instructions, when used with auxiliary relays M2800 to M3071, 

only activate the first instruction encountered in the program scan, after the point in 
the program where the device changes. Any other pulse operation instructions will 
remain inactive.

•

This is useful for use in STL programs (see chapter 3) to perform single step 
operation using a single device.

•

Any other instructions (LD, AND, OR, etc.) will operate as expected. 

For more details please see page 4-5.