Rockwell Automation 1746-HSCE2 Multi-Channel High Speed Counter Module - Manual (Page 68)

Publication 1746-UM002B-EN-P - August 2004
4-18 Configuration and Programming
CNTR No.: Counter Number Bits
(Word 1, Bits 08 and 09)
These two bits select the counter to which this programming block is
applied.
Minimum/Maximum Rate Value Words
(Words 1 to 4)
The valid range of this parameter is dependent on the operating class
of the module.
If the calculated rate value is less than the minimum value, a rate
underflow bit is set in the input image table. If the calculated rate
value is greater than the maximum value, a rate overflow bit is set in
the input image table. Outputs assigned to the counter still function
normally.
Operating Class
The format of the minimum/maximum rate values depends on the
operating class of the module.
Class 1
When the module is operating as Class 1, the minimum/maximum rate
values are programmed in two-word integer format.
Table 4.8 Counter Number Bit Settings
Bit 09 Bit 08 Counter Number
0 0 Counter 1
0 1 Counter 2
1 0 Counter 3
1 1 Counter 4
Class 1 Rate Value (Hz) Class 4 Rate Value (Hz)
Minimum -32,767 to +32,766 Minimum -1,000,000 to +999,999
Maximum (Min. Value +1) to +32,767 Maximum (Min. Value +1) to +1,000,000