Ladder Logic Elements and Instructions

Standard Ladder Logic Elements, Continued

Standard Ladder

Logic

Symbol

Meaning

Nodes Consumed

 

Instructions,

 

 

 

 

Other Special Purpose Instructions

 

 

Continued

 

 

 

 

 

 

CKSM

Calculates any of four types of checksum

3

 

 

 

 

 

operations (CRC-16, LRC, straight CKSM,

 

 

 

 

and binary add)

 

 

 

 

 

 

 

 

MSTR

Specifies a function from a menu of

3

 

 

 

networking operations

 

 

 

 

 

 

 

 

PID2

Performs proportional-integral-derivative

3

 

 

 

calculations for closed-loop control

 

 

 

 

 

 

 

 

TBLK

Moves a block of data from a table to

3

 

 

 

another specified block area

 

 

 

 

 

 

 

 

BLKT

Moves a block of registers to specified

3

 

 

 

locations in a table

 

 

 

 

 

 

 

 

XMIT

Allows CPU to act as a Modbus master

3

 

 

 

 

 

 

 

 

 

 

 

870 USE 101 10 V.2

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Schneider Electric Processor Adapter manual Standard Ladder Logic, Other Special Purpose Instructions