Rockwell Automation Publication 2080-UM002L-EN-E - November 2021 123
Chapter 8 Use the High-Speed Counter and Programmable Limit Switch
When using HSC function blocks, it is recommended that you:
• Set HSCAppData underflow setting (UFSetting) and lo
w preset setting
(LPSet
ting) to a value less than 0 to avoid possibl
e HSC malfunction
when the HSC accumulator is reset to 0.
•
Set HSCAppData overflow setting (O
FSetting) and high preset setting
(H
PSetting) to a value greater than 0 to avoid possible HSC malfunctio
n
when the HSC accumulator is reset to 0.
In some cases, a sub counter will be disabled by master counter mode. For
more information, see HSC Mode (H
SCAPP.HSCMode)
on page 127.
HSC Inputs and
Wiring Mapping
All Micro830, Micro850, and Micro870 controllers, except 2080-LCxx-xxAWB,
have 100 kHz high-speed counters. Each main high-speed counter has four
dedicated inputs and each sub high-speed counter has two dedicated inputs.
HSC0's sub counter is HSC1, HSC2's sub counter is HSC3, and HSC4's sub
counter is HSC5. Each set of counters share the input. The following table
shows the dedicated inputs for the HSCs depending on the mode.
HSC0 is used in this document to define how any HSC works.
IMPORTANT
The HSC function can only be used with the controller’s embedded I/O. It
cannot be used with expansion I/O modules.
Table 17 - Micro830, Micro850, and Micro870 High Speed Counters
10/16-point 24-point 48-point
Number of HSC 2 4 6
Main high-speed counters 1 (counter 0) 2 (counter 0,2) 3 (counters 0, 2 and 4)
Sub high-speed counters 1 (counter 1) 2 (counter 1,3) 3 (counters 1, 3 and 5)
High-Speed Counter Inputs Used
HSC0 0, 1, 2, 3
HSC1 2, 3
HSC2 4, 5, 6, 7
HSC3 6, 7
HSC4 8, 9, 10, 11
HSC5 10, 11
Table 18 - HSC Input Wiring Mapping
Embedded Input
00102030405060708091011
HSC0 A/C B/D Reset Hold
HSC1 A/C B/D
HSC2 A/C B/D Reset Hold
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