Rockwell Automation 1746-HSCE,D17466.5 High-Speed Counter Module - Manual (Page 38)

Publication 1746-UM006B-EN-P - August 2005
2-20 Module Operation
When using Rate Mode, use the Ring Counter and set the Reset
Value/Maximum Count Value (M0:e.34)) to 32,767. Doing so allows
the counter to roll over after reaching 32,767. If the Linear Counter
counts beyond 32,767, it will cause an overflow (as explained in
Linear Counter Overflow/Underflow located in Chapter 5).
Rate Mode with Linear Counter
IMPORTANT
Appendix D contains blank worksheets to assist you
when configuring your module for Rate Mode
operation.
ATTENTION
If the input pulse rate is above 32767 Hz, a RAte
Measurement Overflow occurs. The Rate
Measurement Overflow bit (I:e.0/5) will then be set
to 1. Refer to Rate Measurement Overflow located in
Chapter 5.
Output 2
Output 1
Output 0
Output 3
off
on
Range 3
Range 2
Range 4 Range 1 Range 4
–32,767 +32,767
Counter Value
0
Range Starting
Value Ending
Value
Outputs
(1)
(1) Bits 0-3 are physical outputs, bits 4-7 are soft outputs.
Outputs On
7 6 5 4 3 2 1 0
1 -7000 Hz -5000 Hz 0 0 0 0 0 0 0 1 0
2 -1000 Hz +4500 Hz 0 0 0 0 0 0 1 0 1
3 -4000 Hz +3000 Hz 0 0 0 0 0 1 0 0 2
4 +20,000 Hz -20,000 Hz 0 0 0 0 1 0 0 1 0 and 3