Understanding Module Operation
3-12
High Speed Counter Encoder Module User Manual
3.6 Setting Preset Values and Programming Options for Channel 1
The
lower byte of WY21 and all of WY22 contain the Preset 1 24-bit integer
value. Use the upper byte of WY21 to configure programming values.
Together
, the preset value and the programming values determine the count
method and how Output 1 functions when count and preset are equal, or
when the count value overflows or underflows. T
able 3-10 (shaded areas)
shows the word formats. T
able 3-1
1 lists the programming values of WY21.
T
able 3-10
Channel 1, 24-Bit Counter: Pr
eset 1 V
alue
Word MSByte LSByte
WY21 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
WY22 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
T
able 3-11
Channel 1, 24-Bit Counter: WY21 Pr
ogramming Bit V
alues
Bit Position Description
01 02 03 04 05 06 07 08 Mode
0 0 0
Direction counting (count: input A, direction: input B)
0 0 1
Direction counting (count: input A, direction: input B)
0 1 0
Up/Down counting (count up: input A, count down: input B)
0 1 1
Up/Down counting (count up: input A, count down: input B)
1 0 0 Quadrature 1X (input A pulses, input B pulses)
1 0 1 Quadrature 2X (input A pulses, input B pulses)
1 1 0
Quadrature 4X (input A pulses, input B pulses)
1 1 1
Quadrature 4X (input A pulses, input B pulses)
01 02 03 04 05 06 07 08 Counter Mode Setup
0 0 0 Binary counting, recycle mode
0 0 1 Binary counting, non-recycle mode*
0 1 0 Divide-by-N counting, recycle mode
0 1 1 Divide-by-N counting, non-recycle mode*
01 02 03 04 05 06 07 08 Internal Sample Interval
1 0 0 1 millisecond sample, (binary, recycle mode)
1 0 1 10 millisecond sample, (binary, recycle mode)
1 1 0 100 millisecond sample, (binary, recycle mode)
1 1 1 1 second sample, (binary, recycle mode)
0 Index or Period pulse latches counter value
1 Index or Period pulse loads counter with preset 1 value
0 Output Compare, Latch, Compare Toggle, (select jumper to match)
1 Output Rollover, (select jumper to match)
*In this mode, the output is configured as borrow toggle and carry toggle. These outputs are the cycle completion indicator.
Channel
1,
24-Bit Counter 1,
Pr
eset 1
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