Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual do Utilizador descarregar pdf (Página 182)

100

101

Preface

MicroLogix 1000 Programmable Controllers User Manual

10–4

Jump to Subroutine (JSR), Subroutine (SBR), and

Return (RET)

The JSR, SBR, and RET instructions are used to direct the controller to execute a

separate subroutine file within the ladder program and return to the instruction

following the JSR instruction.

Note If

you use the SBR instruction, the SBR instruction must be the first instruction on

the first rung in the pr

ogram file that contains the subr

outine.

Use a subroutine to store recurring sections of program logic that must be executed

from several points within your application program. A subroutine saves memory

because you program it only once.

Update critical I/O within subroutines using immediate input and/or output

instructions (IIM, IOM), especially if your application calls for nested or relatively

long subroutines. Otherwise, the controller does not update I/O until it reaches the

end of the main program (after executing all subroutines).

Outputs controlled within a subroutine remain in their last state until the

subroutine is executed again.

False

22.24

True

4.25

JSR

1.45 0.99SBR

Execution Times (µsec) when:

31.11 3.16RET

JSR

JUMP TO SUBROUTINE

SBR file number

SBR

SUBROUTINE

RET

RETURN

1 2 ... 177 178 179 180 181 182 183 184 185 186 187 ... 421 422

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