Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Publication 1763-RM001C-EN-P - October 2009
112 Using the High-Speed Counter and Programmable Limit Switch
HSC Mode 7 - Quadrature Counter (phased inputs A and B) With External Reset
and Hold
Blank cells = don’t care, ⇑ = rising edge, ⇓ = falling edge
TIP
Inputs I1:0.0/0 through I1:0.0/3 are available for use as
inputs to other functions regardless of the HSC being
used.
HSC Mode 7 Examples
Input
Terminals
I1:0.0/0 (HSC0) I1:0.0/1 (HSC0) I1:0.0/2 (HSC0) I1:0.0/3 (HSC0) CE
Bit
Comments
Function Count A Count B Z reset Hold
Example 1
(1)
⇑
off (0) off (0) on (1) HSC Accumulator + 1 count
Example 2
(2)
⇓ off (0) off (0) off (0) on (1) HSC Accumulator - 1 count
Example3 ⇓ off (0) off (0) on (1) Reset accumulator to zero
Example 4 on (1) Hold accumulator value
Example 5 on (1) Hold accumulator value
Example 6 off (0) on (1) Hold accumulator value
Example 7 off (0) off (0) Hold accumulator value
(1) Count input A leads count input B.
(2) Count input B leads count input A.
TIP
Inputs I1:0.0/0 through I1:0.0/3 are available for use as
inputs to other functions regardless of the HSC being
used.
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Allen-Bradley MicroLogix 1100 Specifications

General

Processor	32-bit
Programming Software	RSLogix 500
Mounting	DIN rail or panel mount
Power Supply	24V DC
Type	Compact PLC
Digital Inputs	12
Digital Outputs	8
Analog Inputs	4 (depending on model)
Analog Outputs	Optional with expansion module
Programming Language	Ladder Logic
Operating Temperature	0 to 55 °C (32 to 131 °F)
Series	MicroLogix