Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 168

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
■LDPI, LDFI
• LDFI is a rising edge pulse NOT operation start instruction, and turns on when the specified device is off, on, or at the falling
edge (on to off). When a bit-specified word device is used, this instruction turns on when the specified bit is 0 or 1 or when
the bit changes from 1 to 0.
• LDFI is a falling edge pulse NOT operation start instruction, and turns on when the specified bit device is at the rising edge
(off to on), off, or on. When a bit-specified word device is used, this instruction turns on when the specified bit is 0 or 1 or
when the bit changes from 0 to 1. The following table lists the on/off information used by the LDPI and LDFI instructions.
Device specified by LDPI or LDFI
Bit device
OffOn
Off
On
OnOff
• If the LDPI instruction is used in the program written in ST language or FBD/LD, ENO turns on at the timing except the
rising edge (off to on) of the specified bit device (s).
• If the LDFI instruction is used in the program written in ST language or FBD/LD, ENO turns on at the timing except the
falling edge (on to off) of the specified bit device (s).
• If the LDPI or LDFI instruction is used in the program written in ST language, set EN to be always on.
• If the LDPI or LDFI instruction is used in the program written in FBD/LD, use a left rail or a variable/constant which is always
on for EN.
5 SEQUENCE INSTRUCTIONS
166
5.1 Contact Instructions
Word
J\ T, ST, C, D, W,
SD, SW, FD, R,
ZR, RD
 
Bit-specified word device
01
0
1
10
Range



Double word
U\G, J\, Z LT, LST,
U3E\(H)G LC
  
Word
SA\T, SA\ST, SA\C, SA\D, SA\W, SA\SD

LDPI status
Off
On
On
On
Data type Data type (label)
Bit ANY_BOOL
Bit BOOL
Bit BOOL
Indirect Constant
specification
LZ K, H
  
Constant
K, H

LDFI status
On
On
On
Off
Others
(DX)
E $
  