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2-6
2.3 Sequence Instructions
2.3.1 Contact instructions
Table 2.3 Contact Instructions
*1: The number of steps may vary depending on the device being used.
Category
Instruction Symbol
Symbol Processing Details
Execution
Condition
Number of Basic Steps
Subset
See for Description
Contact
LD
• Starts logic operation
(Starts a contact logic operation)
*1
5-2
LDI
• Starts logical NOT operation
(Starts b contact logic operation)
AND
• Logical product (a contact series connection)
ANI
• Logical product NOT (b contact series
connection)
OR
• Logical sum (a contact parallel connection)
ORI
• Logical sum NOT (b contact parallel
connection)
LDP
• Starts leading edge pulse operation
*2
5-5
LDF
• Starts trailing edge pulse operation
ANDP
• Leading edge pulse series connection
ANDF
• Trailing edge pulse series connection
ORP
• Leading edge pulse parallel connection
ORF
• Trailing edge pulse parallel connection
LDPI
• Starts leading edge pulse NOT operation 3
5-7
LDFI
• Starts trailing edge pulse NOT operation 3
ANDPI
• Leading edge pulse NOT series connection 4
ANDFI
• Trailing edge pulse NOT series connection 4
ORPI
• Leading edge pulse NOT parallel connection 4
ORFI
• Trailing edge pulse NOT parallel connection 4
Device Number of Steps
Internal device, file register (R0 to R32767)
1
Direct access input (DX)
2
Devices other than above
3