166
5 SEQUENCE INSTRUCTIONS
5.1 Contact Instructions
Setting data
■
Description, range, data type
• 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
• In safety programs executed by the Safety CPU, only the following safety devices and constants can be used.
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.
• 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.
Operand
Description
Range
Data type
Data type (label)
(s)
Device used as a contact
Bit
ANY_BOOL
EN
Execution condition
Bit
BOOL
ENO
Execution result
Bit
BOOL
Operand
Bit
Word
Double word Indirect
specification
Constant
Others
(DX)
X, Y, M, L,
SM, F, B, SB,
FX, FY
J
\
T, ST, C, D, W,
SD, SW, FD, R,
ZR, RD
U
\G
, J
\
,
U3E
\(H)G
Z
LT, LST,
LC
LZ
K, H
E
$
(s)
Operand
Bit
Word
Constant
SA\X, SA\Y, SA\M, SA\SM, SA\B
SA\T, SA\ST, SA\C, SA\D, SA\W, SA\SD
K, H
(s)
Device specified by LDPI or LDFI
LDPI status
LDFI status
Bit device
Bit-specified word device
Off
On
0
1
Off
On
Off
0
On
On
On
1
On
On
On
Off
1
0
On
Off
Summary of Contents for MELSEC iQ-R Series
Page 1: ...MELSEC iQ R Programming Manual Instructions Standard Functions Function Blocks ...
Page 2: ......
Page 24: ...22 INDEX 2092 INSTRUCTION INDEX 2093 REVISIONS 2104 WARRANTY 2105 TRADEMARKS 2106 ...
Page 34: ...32 MEMO ...
Page 35: ...33 PART 1 PART 1 OVERVIEW This part consists of the following chapter 1 OVERVIEW ...
Page 68: ...66 1 OVERVIEW 1 5 Precautions on Programming MEMO ...
Page 1448: ...1446 14 REDUNDANT SYSTEM INSTRUCTIONS 14 2 Disabling Enabling System Switching MEMO ...
Page 1972: ...1970 33 TIME DATA TYPE FUNCTIONS 33 4 Division MEMO ...
Page 2067: ...APPX Appendix 5 PID Control Program Examples 2065 A 252 Set PID control data for loop 2 ...
Page 2109: ......