Spectrum Controls SLC 500, Руководство пользователя

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Chapter 5: Programming Examples 5-3
User’s Manual Pub. 0300181-07 Rev. A
Channel 0 Output Register Configuration (O:e.0)
Config. Bit Description Bit Setting Description
*15 Normal 0 Normal Mode
14 Roll Under 1 Preset
13 Roll Over 0 Roll to Zero
12 Direction 0 (Default) No Inversion
11 Count Size 0 (Default) ±32K
10 Freq. Filter 0 (Default) 50kHz
9 Stop on Limit 0 No Stop
8 Stop on Zero 0 (Default) N/A
6/7 Count Mode 00 (Default) Uni-Directional
4/5 Input Range 00 (Default) 50mV-30VAC
3 Rate Mode 0 (Default) Instant
2 Reset Flags 0 (Default) Toggle each Rev.
1 Counter Preset 0 (Default) Off
Output Word - O:e.1 Counter Preset= 20,000
Output Word - O:e.2 Counter Limit = 20,000
A ring counter is configured by setting the preset and limit values to the same
count and setting the roll over to zero and roll under to preset bits. Zero must
always be the starting point and the maximum value must always be positive.
The above figure illustrates counting in a clockwise direction.
Section 5.4 Using
Preset Values with
Extended Mode
The Counter Preset and Counter Limit functions are affected by the Count Size
Configuration Bit 11. The default counter range is ±32 K but may be extended to
±8 M.
When operating in the extended range, ±8 M, all Counter Preset and Counter