Allen-Bradley MicroLogix 1400 - Page 123

Publication 1766-RM001A-EN-P - October 2008
Using the High-Speed Counter and Programmable Limit Switch 121
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 I1:0.0/11 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 I1:0.0/11 are available for use as inputs to other
functions regardless of the HSC being used.
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