Ladder statement field, Points to note – IAI America SSEL User Manual

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Part 2 Programs

2. Ladder Statement Field

[1] Extension

conditions

LOAD

AND

BLOCK

All of the above extension conditions can be used in non-ladder tasks.

[2] Ladder

commands

OUTR

Ladder output relay (Operand 1 = Output, flag number)

TIMR

Ladder timer relay (Operand 1 = Local flag number, Operand 2 =

Timer setting (sec))

3. Points to Note

x This system only processes software ladders using an interpreter. Therefore, the processing time is

much longer than that of a dedicated commercial sequencer.
(This system is not suitable for large-scale ladder processing.)

x If an extension condition is not specified for steps in which an input condition is specified, the steps will

be treated as LD (LOAD).

x Always specify a “normally ON” contact for those steps that must be processed without fail, such as

CHPR, TSLP and GOTO. (LD 7001)
Virtual input 7001: “Normally ON” contact

x The following circuit cannot be expressed. Create an equivalent circuit.

Cannot be expressed.

OUTR301

OUTR302