Rockwell-automation 57C620 AutoMax Programming Executive Version 3.8 Manual de usuario descargar pdf (Pagina 198)

18Ć10 AutoMax Programming Executive Version 3.x

18.1.6.3 Forcing a Variable

WARNING

THE SET AND FORCE FUNCTIONS BYPASS CONTROL OF THE APPLICATION

PROCESS BY THE APPLICATION TASKS. IT IS THE RESPONSIBILITY OF THE

USER TO DETERMINE THE POTENTIAL HAZARDS INVOLVED. FAILURE TO

OBSERVE THESE PRECAUTIONS COULD RESULT IN BODILY INJURY.

WARNING

VARIABLES

AND OUTPUTS WHICH

ARE FORCED BEFORE AC POWER IS L

OST

WILL

REMAIN FORCED WHEN AC POWER IS RESTORED

. SHOULD AC POWER

BE LOST WHILE VARIABLES ARE FORCED, THE USER MUST ENSURE THAT

UNEXPECTED

MACHINE MO

VEMENT DOES NOT OCCUR WHEN AC POWER IS

RESTORED. FAILURE TO OBSERVE THESE PRECAUTIONS COULD RESULT IN

BODILY INJURY.

You can force up to 16 variables at a time to specific values. Forcing

variables while in the Monitor Variable Modify

menu is essentially

the same as using the Force option described in 18.5. Strings, array

elements, and tunable variables cannot be forced. Only booleans,

single

precision integers, double precision

integers, and reals can be

forced. If you define bits in a register that is also defined as a register

neither the bits nor the register can be forced. A forced variable

cannot be changed in any way by application tasks or the state of

physical I/O

. The value of a forced variable can only be affected by

forcing it to another value or unforcing it. See 18.1.6.4 for more

information about unforcing a variable. You can define a reserved

common

variable, FORCINGST

TUS@, that will indicate whether any

variables in the rack have been forced. See 7.2.2 for more

information.

Follow the directions below to force a variable.

1. Enter F

" for F

orce" from the Monitor Variable Modify menu.

2. Enter

the name of the task containing the variable to

be forced at

the blinking cursor. If the variable is a COMMON, you do not

need to enter a task name.

3. Enter the name of the variable to be forced, including any

terminating character designating variable type, at the blinking

cursor.

4. If this is the first time you are forcing a variable, the Value" field

will be blank. Otherwise, the Value" field will display the last

value to which a variable was forced. Enter the desired value for

the variable, typing over the last value entered, if it is displayed.

The syntax and range of the value you enter will depend on the

the variable type. See figure 18.3 for the value ranges of variable

types.

1 2 ... 193 194 195 196 197 198 199 200 201 202 203 ... 297 298

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