Rockwell-automation Logix5000 Controllers Ladder Diagram Programming M Manuale Utente Scaricare il pdf (Pagina 14)

Chapter 1 Program ladder diagram

Arrange the output instructions

Place at least one output instruction to the right of the input instructions. You can

enter multiple output instructions on a rung of logic:

Option Example

Place the output instructions in sequence on the rung (serial).

Place the output instructions in branches (parallel).

Place the output instructions between input instructions. The last instruction on the rung

must be an output instruction.

Choose a tag name for an operand

Tag names follow these formats:

For a: Specify:

Tag tag_name

Bit number of a larger data type tag_name.bit_number

Member of a structure tag_name.member_name

Element of a one dimension array tag_name[x]

Element of a two dimension array tag_name[x,y]

Element of a three dimension array tag_name[x,y,z]

Element of an array within a structure tag_name.member_name[x]

Member of an element of an array tag_name[x,y,z].member_name

where:

• x is the location of the element in the first dimension.

• y is the location of the element in the second dimension.

• z is the location of the element in the third dimension.

14 Rockwell Automation Publication 1756-PM008E-EN-P - October 2014

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Rockwell-automation Logix5000 Controllers Ladder Diagram Programming M Manuale Utente Pagina 14