Preface
MicroLogix 1000 Programmable Controllers User Manual
12–20
The high-speed counter hardware is updated immediately when the HSL instruction
is executed regardless of high-speed counter type (Up Counter or Bidirectional
Counter). For the Up Counters, the last two registers are ignored since the low
preset does not apply
.
If a fault occurs due to the HSL instruction, the HSL parameters are not loaded to
the high-speed counter hardware. You can use more than one HSL instruction in
your program. The HSL instructions can have different image locations for the
additional parameters.
Do not change a pr
eset value
and an output mask/source with the same HSL
instruction as the accumulator is approaching the old pr
eset value.
If the high-speed counter is enabled and the HSL instruction is evaluated true,
the high-speed counter parameters in the HSL instruction are applied
immediately without stopping the operation of the high-speed counter. If the
same HSL instruction is being used to change the high-speed counter
controlled mask/source and the preset, the mask/source is changed first and
the pr
eset second. (The pr
eset is changed within 40µs after the mask/source.)
If the original pr
eset is r
eached after the new mask/source is applied but
before the new preset is applied, the new outputs are applied immediately.
efesotomasyon.com - Allen Bradley,Rockwell,plc,servo,drive
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