Allen-Bradley MicroLogix 1400 Instruction Manual page 122

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120 Using the High-Speed Counter and Programmable Limit Switch
HSC Mode 2 Examples
Input Terminals I1:0.0/0 (HSC0)
Function Count
⇑
Example 1
⇑
Example 2
Example3
⇑
Blank cells = don't care, = rising edge,
HSC Mode 3 Examples
Input Terminals I1:0.0/0 (HSC0)
Function Count
⇑
Example 1
⇑
Example 2
Example3
Example 4
⇓ off
Example 5 on
(1)
Example 6
⇑
Blank cells = don't care, = rising edge,
Publication 1766-RM001A-EN-P - October 2008
HSC Mode 2 - Counter with External Direction
I1:0.0/1 (HSC0) I1:0.0/2 (HSC0)
Direction Not Used
off
(0)
on
(1)
⇓
= falling edge
Inputs I1:0.0/0 through I1:0.0/11 are available for use as inputs to other
TIP
functions regardless of the HSC being used.
HSC Mode 3 - Counter with External Direction, Reset, and Hold
I1:0.0/1 (HSC0) I1:0.0/2 (HSC0)
Direction Reset
off on
(0) (1)
on on
(1) (1)
on
(1)
on
(1)
on
(0) (1)
⇑
⇓
= falling edge
Inputs I1:0.0/0 through I1:0.0/11 are available for use as inputs to other
TIP
functions regardless of the HSC being used.
I1:0.0/3 (HSC0) CE Bit
Not Used
on (1)
on (1)
off (0)
I1:0.0/3 (HSC0) CE Bit
Hold
⇓ off
off on (1)
(0) (0)
⇓ off
off on (1)
(0) (0)
⇓ off
on
(0) (1)
⇓ off
off (0)
(0)
⇓ off
(0)
Comments
HSC Accumulator + 1 count
HSC Accumulator - 1 count
Hold accumulator value
Comments
HSC Accumulator + 1 count
HSC Accumulator - 1 count
Hold accumulator value
Hold accumulator value
Hold accumulator value
Clear accumulator (=0)