Rockwell Automation 1746-HSCE,D17466.5 High-Speed Counter Module - Manual (Page 99)

Publication 1746-UM006B-EN-P - August 2005
Configuration and Programming 4-39
I:e.0 Bit 4 - Rate Counter Overflow
When this bit is set, a Rate Period Counter overflow has been
detected. The bit is dynamically updated after every Rate Period. You
can adjust the Rate Period when an overflow is detected. When the
overflow occurs, the Rate Period will be set to ±32767. Refer to Rate
Counter Overflow in Chapter 5.
The module sets this bit to 1 when the Rate Period Counter
Overflows. This bit is cleared upon the 0 to 1 transition of the
Function Control bit.
I:e.0 Bit 5 - Rate Measure Overflow
When this bit is set to 1, one of the following conditions exist:
•
The calculated Rate Measurement input parameter exceeds the
maximum rate of ± 32767.
•
A Rate Period Counter overflow is detected.
The bit is dynamically updated after every Rate Measurement. When
the overflow occurs, the Rate Period will be set to ±32767 Hz.
When a Rate Period does not cause any overflows, the bit is cleared.
This bit is cleared upon the 0 to 1 transition of the Function Control
bit.
Rate Counter Overflow (bit 4) Cause
0 No rate period overflow detected
1 Rate period counter overflow detected
Rate Measurement Overflow (bit 5) Cause
0 No rate period overflow detected
1 Rate period counter overflow detected, or
maximum rate of ±32767 Hz has been met