Spectrum Controls SLC 500 User Manual page 33

Figure 4-2. Configuration Word Settings
Counter Start/Stop: (Configuration Bit 0)
This bit allows the counter to continue to count up or down from its present
value.
Starting or enabling the counter with this bit will not override the external
NOTE
counter enable input. The external input enable, and the counter start bit
must both be enabled for the counter to continue counting. If either the
counter stop bit, or the external input enable line are disabled the counter
will hold its last value and stop counting.
Counter Preset: (Configuration Bit 1)
When this bit is set, the value in counter preset word is loaded into the counter.
The counter preset can be used to set the counter to an initial starting value. The
bit should be set for at least 2 I/O scans. The bit can be held on until the data in
the counter data is verified to be equal to the preset value. The counter will hold
the preset value until the counter preset bit is turned off. At this time normal
counter functions will resume.
A Counter Reset function is achieved by using the Counter Preset, when
NOTE
the preset value is set to zero.
Refer to the Preset and Limit Data Value Configuration section for more
information about loading your preset value.
Chapter 4: Channel Configuration, Data, and Status
User's Manual Pub. 0300181-07 Rev. A
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