Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 141)

Chapter 8
Using Basic Instructions
8–22
Entering Parameters
Accumulator Value (ACC)
This is the number of false-to-true transitions that have occurred since the
counter was last reset.
Preset Value (PRE)
Specifies the value which the counter must reach before the controller sets
the done bit. When the accumulator value becomes equal to or greater than
the preset value, the done status bit is set. You can use this bit to control an
output device.
Preset and accumulated values for counters range from –32,768 to +32,767,
and are stored as signed integers. Negative values are stored in two’s
complement form.
Entering the Instructions
The following items apply when entering the instructions:
•
Whenever you see asterisks on the display, the HHP is waiting for data
entry (i.e., a number).
•
If you see a down arrow on the display it means there are more options
available. To scroll through the options, press this key:
•
You can return to previously entered operands by pressing this key:
Then if you want to edit that operand, press DEL or FUN-DEL and enter
new parameters. Press ENT to accept the operand and move on to the next
one. Once the entire instruction is entered, if you want to edit the
instruction’s parameters you must go into the overwrite mode. (See page
17–4.)