Allen-Bradley MicroLogix 1000 User Manual

Using High-Speed Counter Instructions
12–9
When a high preset is reached, no counts are lost.
• Hardware and instruction accumulators are reset.
• Instruction high preset is loaded to the hardware high preset.
• If the DN bit is not set, the DN bit is set. The IH bit is also set and the IL, IV,
and IN bits are reset.
• If the DN bit is already set, the OV bit is set. The IV bit is also set and the IL,
IV and IN bits are reset.
• High-speed counter interrupt file (program file 4) is executed if the interrupt is
enabled.
The following tables summarize what the input state must be for the corresponding
high-speed counter action to occur:
Up Counter
Input State
H g -Speed
Input Count
(I/O)
Input
Direction
(I/1)
Input Reset
(I/2)
Input Hold
(I/3)
HSC Rung
High-Speed
Counter Action
Turning
Off-to-On
NA NA NA True Count Up
NA NA NA NA False Hold Count
Off, On, or
Turning Off
NA
Off, On, or
Turning Off
NA NA Hold Count
NA (Not Applicable)
Programming
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Allen-Bradley MicroLogix 1000 Specifications

General

Communication Ports	RS-232
Power Supply	24V DC or 120/240V AC
Programming Software	RSLogix 500
Manufacturer	Allen-Bradley
Category	Controller
Series	MicroLogix
Programming Language	Ladder Logic
Input Voltage	24V DC or 120/240V AC
I/O Points	10 to 32 points
Processor Type	8-bit
Operating Temperature	0…55 °C (32…131 °F)
Processor	8-bit