Rockwell-automation Logix5000 Controllers Function Block Diagram Progr Manual de usuario descargar pdf (Pagina 11)

Program a Function Block Diagram Chapter 1

For a: Specify:

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.

For a structure within a structure, add an additional member_name.

Define execution order (flow of data) by wiring elements together and indicating

any input (feedback) wires, if necessary. The location of a block does not affect the

order in which the blocks execute.

Data latching

If you use an IREF to specify input data for a function block instruction, the data

in that IREF is latched for the scan of the function block routine. The IREF

latches data from program-scoped and controller-scoped tags. The controller

updates all IREF data at the beginning of each scan as shown in this diagram.

Define the order of

execution

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Rockwell-automation Logix5000 Controllers Function Block Diagram Progr Manual de usuario Pagina 11