Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 165

Setting data
■Description, range, data type
Operand Description
(s) Device used as a contact
EN Execution condition
ENO Execution result
• In safety programs executed by the Safety CPU, only safety devices and safety labels of data types described in the table
can be used.
■Applicable devices
Operand Bit
X, Y, M, L,
SM, F, B, SB,
FX, FY

(s)
• In safety programs executed by the Safety CPU, only the following safety devices and constants can be used.
Operand Bit
SA\X, SA\Y, SA\M, SA\SM, SA\B

(s)
Processing details
■LDP, LDF
• LDP is a rising edge pulse operation start instruction, and turns on only at the rising edge (off to on) of the specified bit
device. When a bit-specified word device is used, this instruction turns on only when the specified bit changes from 0 to 1.
In cases where there is an LDP instruction only, it acts identically to instructions for conversion to pulses that are executed
during on (P).
The following figure shows an example when a ladder using the LDP instruction is replaced with a ladder not using the LDP
instruction.
X0
MOV K0 D0
M0
X0
• LDF is a falling edge pulse operation start instruction and turns on only at the falling edge (on to off) of the specified bit
device. When a bit-specified word device is used, this instruction turns on only when the specified bit changes from 1 to 0.
• If the LDP instruction is used in the program written in ST language or FBD/LD, ENO turns on at the rising edge (off to on)
of the specified bit device (s).
• If the LDF instruction is used in the program written in ST language or FBD/LD, ENO turns on at the falling edge (on to off)
of the specified bit device (s).
• If the LDP or LDF instruction is used in the program written in ST language, set EN to be always on.
• If the LDP or LDF instruction is used in the program written in FBD/LD, use a left rail or a variable/constant which is always
on for EN.
Word
J\ T, ST, C, D, W, U\G, J\,
SD, SW, FD, R, U3E\(H)G
ZR, RD
  
Word
SA\T, SA\ST, SA\C, SA\D, SA\W, SA\SD

X0
MOVP
X0
Range Data type

Bit

Bit
 Bit
Double word
Z LT, LST, LZ
LC
  
K0 D0
PLS M0
Data type (label)
ANY_BOOL
BOOL
BOOL
Indirect Constant Others
specification (DX)
K, H E $
    
Constant
K, H

5 SEQUENCE INSTRUCTIONS
5.1 Contact Instructions
5
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