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2-6

Sequence Instructions

Contact instructions

Table 2.3 Contact Instructions

*1:  The number of steps may vary depending on the device being used.

Category

Instr

uction Symbol

Symbol

Processing Details

Execution 

Condition

N

umber of

 B

a

sic S

tep

s

Subset

See for

 Descr

iption

Contact

LD

• Starts logic operation

(Starts a contact logic operation)

*1

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

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

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