Emerson FM-3 Manual de instalación descargar pdf (Pagina 99)

Programming

Dwell For Time

This motion instruction is used to pause program execution for a very precise amount of time.

It operates as a motion instruction – similar to an index, home or jog. Like all other motion

instructions it will not start until the preceding motion instruction has completed. A “Wait for

Index.AnyCommandComplete” is not required. Likewise, any subsequent motion commands

will wait and start after the dwell has completed. The total time required to complete a sequence

of indexes and “Dwell For Time” instructions is extremely repeatable.

The “Dwell For Time” instruction is in units of seconds with a resolution of milliseconds (0.000

seconds).

If you want to pause the program while an index is executing you should use a “Wait for Time”

instruction described below.

A comment is automatically inserted after the “Dwell For Time” instruction which notes that

the dwell time is in units of seconds. The comment starts with the ‘ character.

Examples:

Do While (TRUE)

Index.0.Initiate ‘Incremetal,Dist=25.000in,Vel=25in/s

Dwell For Time 1.000 ‘Seconds

Loop

Do While (TRUE)

Index.0.Initiate ‘Incremetal,Dist=25.000in,Vel=25in/s

Dwell For Time 1.000 ‘Seconds

Index.1.Initiate ‘Incremental,Dist=15.000in,Vel=25in/s

Dwell For Time 0.500 ‘Seconds

Loop

Program Flow Instructions

If/Then/Endif

This is a program flow control instruction used to selectively run a section of code only if a

logical test condition is true. If the test evaluates to true the code between the If/Then and

Endif lines is executed. If the test evaluates to false the code is not executed and the program

skips to the next line of code after the Endif.

Logical tests (AND, OR, NOT) can be used in the If/Then/Endif instruction. Parenthesis “()”

can be used to group the logical tests.

Examples:

If DriveInput.1=ON Then ’Turn Outputs 1 On and 2 Off if Drive

’Input.1 is ON.

DriveOutput.1=ON

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Emerson FM-3 Manual de instalación Pagina 99