Preface
MicroLogix 1000 Programmable Controllers User Manual
12–16
When a high preset is reached, the:
•
HP bit is set.
•
High-speed counter interrupt file (program file 4) is executed if the interrupt is
enabled. The IH bit is set and the IL, IN, and IV bits are reset.
Unlike the Up Counters, the accumulator value does not reset and the high preset
value does not get loaded from the image to the hardware high preset register.
The Following Condition
Occurs when
either the hardware accumulator transitions from the hardware low
1 to the hardware low preset, or
A low preset is reached
the hardware accumulator is loaded with a value less than or equal
to the hardware low preset, or
the hardware low preset is loaded with a value that is greater than
or equal to the hardware accumulator.
When a low preset is reached, the:
•
LP bit is set.
•
High-speed counter interrupt file (program file 4) is executed if the interrupt is
enabled. The IL bit is set and the IH, IN, and IV bits are reset.
An overflow occurs when the hardware accumulator transitions from
+
32,767 to
–32,768. When an overflow occurs, the:
•
OV bit is set.
•
High-speed counter interrupt file (program file 4) is executed if the interrupt is
enabled. The IV bit is set and the IH, IL, and IN bits are reset.
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