Rockwell-automation 1771-IJ_IK IK ENCODER/COUNTER MODULES Manual de usuario descargar pdf (Pagina 58)

7–4 Special Programming

Publication 1771ĆUM006B-EN-P - June 2002

Rung Descriptions (Figure 7.2)

Rung 0 – This rung strips the upper byte of the count value and

stores the value.

A = BTR status

B = Mask

R = Temporary count storage with upper byte

removed

A = Temporary count storage with upper byte

removed

R = New count value

Rung 1 – This rung subtracts the old count value from the new value

and stores the difference with its sign.

A = New count value

B = Old count value

R = Difference of new count value less old value

Rung 2 – This rung looks at the sign and magnitude of the difference

from rung 1 and compares it with a constant (a constant less than

999/2 or 4095/2). If positive, the up counter is incremented by one;

if negative, the down counter is decremented by one.

Rung 3 – This rung moves the new count value (A) to the old count

storage location (R).

A = New count value

R – Old value storage location

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Rockwell-automation 1771-IJ_IK IK ENCODER/COUNTER MODULES Manual de usuario Pagina 58