400-Ch. 7

The XIC instruction is the same as

EXAMINE OFF

The XIO instruction is the same as

EXAMINE ON

EXAMINE OFF is looking for..

an OFF condition

EXAMINE ON is looking for..

an ON condition

when a N.O. limit switch is wired to an input module, and programmed using a N.C. contact symbol (EXAMINE OFF), the instruction will be true when?

as long as the limit switch is open

Briefly describe the action of the examine OFF instruction

examines a value of another location & returns the opposite value; TRUE = FALSE

EXAMINE ON instruction:

examines a value of another location and returns the input value as is; a TRUE value is TRUE

for EXAMINE OFF, any address that's actually OFF becomes...

logically TRUE

for EXAMINE OFF, if any address is N.O.

the processor sets the bit to 0

when a N.O. limit switch is wired to an input module, and programmed using a N.O. contact symbol (EXAMINE ON), the instruction will be true when?

when the limit switch is closed