Rockwell Automation 1746-HSCE,D17466.5 High-Speed Counter Module - Manual (Page 69)

Publication 1746-UM006B-EN-P - August 2005
Configuration and Programming 4-9
The user program can change the Function Control bit dynamically in
either the run or test modes to reconfigure or control the operation.
You can change the preset or range information at any time
independent of this bit. Refer to Timing Information in Appendix A.
M0:e.1 Bit 13 - Counter Type (Static)
This bit allows you to define the module’s Counter Type:
M0:e.1 bits 14 and 15 - Operating Mode (Static)
These bits define the module’s Operating Mode.
Counter Type (bit 13) Counter Type
0 Linear
1 Ring
Operating Mode Bits Operating Mode
15 14
0 0 invalid
0 1 Range
1 0 Sequencer
1 1 Rate
IMPORTANT
When operating in the Rate Mode, we recommend
using the Ring Counter (M0:1/13) with a Maximum
Count Value (M0:e.34) of 32,767. Doing so will allow
the counter to roll over if the counts exceed 32,767.
When using the linear counter, an overflow error
(I:e.0/13) will occur when the counts exceed 32,767.