Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Publication 1763-RM001C-EN-P - October 2009
110 Using the High-Speed Counter and Programmable Limit Switch
HSC Mode 4 - Two Input Counter (up and down)
Blank cells = don’t care, ⇑ = rising edge, ⇓ = falling edge
HSC Mode 5 - Two Input Counter (up and down) with External Reset and Hold
Blank cells = don’t care, ⇑ = rising edge, ⇓ = falling edge
HSC Mode 4 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 Up Count Down Not Used Not Used
Example 1 ⇑ on
(1)
⇓ off
(0)
on (1) HSC Accumulator + 1 count
Example 2 on
(1)
⇓ off
(0)
⇑ on (1) HSC Accumulator - 1 count
Example3 off (0) Hold accumulator value
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 5 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 Direction Reset Hold
Example 1 ⇑ on
(1)
⇓ off
(0)
on
(1)
⇓ off
(0)
off
(0)
on (1) HSC Accumulator + 1 count
Example 2 on
(1)
⇓ off
(0)
⇑ on
(1)
⇓ off
(0)
off
(0)
on (1) HSC Accumulator - 1 count
Example3 on
(1)
⇓ off
(0)
on
(1)
Hold accumulator value
Example 4 on
(1)
⇓ off
(0)
off (0) Hold accumulator value
Example 5 on
(1)
⇓ off
(0)
on
(1)
⇓ off
(0)
Hold accumulator value
Example 6 ⇑ Clear accumulator (=0)
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