Acromag IP482 Series, Руководство пользователя

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IP482 Industrial I/O Pack User’s Manual Counter Timer Module
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Acromag, Inc. Tel:248-295-0310 Fax:248-624-9234 Email:solutions@acromag.com http://www.acromag.com
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Table 3.34: Counter Timer Modes Overview
Function
Description Pulse Width
Modulation/
One-Shot Watchdog Event
Counting Frequency
Measure Pulse
Measure Period
Measure Quadrature
Position
Measure
InA Input Gate-Off for
start/stop
control Counter
Reload Gate-Off for
start/stop
control Enable
Frequency
Measurement
for Set
Duration Next complete
pulse after
trigger is
measured. Next complete
period after
trigger is
measured. Channel A
InB Input External Clock External
Clock
Event Input Signal
Measured/
Counted External Clock External Clock Channel B
InC Input External
Trigger External
Trigger or
Gate-Off for
start/stop
control External
Trigger or
Up/Down
Count Control External
Trigger External
Trigger External
Trigger Index
Internal
Software Trig Starts
Waveform
Generation Starts
Count
Down Start Event
Counting Start
Frequency
Measurement
on next active
edge of InA
signal. Next complete
pulse after
trigger is
measured. Next complete
period after
trigger is
measured. Starts
Quadrature
Measurement
Counter Timer
Output Output
Waveform Output is
active from
trigger until
terminal
count. 1.75

s pulse
is output upon
reaching the
count limit
1.75

s pulse
is output upon
end of
frequency
measurement
1.75

s pulse
is output upon
end of pulse
measurement
1.75

s pulse
is output upon
end of period
measurement
Output pulse
while index or
programmed
count limit
remains true.
Constant A
Reg Count down
from value
loaded.
Defines
duration until
active pulse Counts
down from
value
loaded.
Must
always load
before
trigger.
Note that
InA input
can be
used to
reload. Count Limit.
Input events
are counted
up to the
count limit. An interrupt
can be
generated
when the
counter
equals the
Constant A
value.
Constant B
Reg Count down
from value
loaded.
Defines
duration of
active pulse Constant B
can be
reloaded on
occurrence of
an Index
signal.
Counter Read
Back Reg Gives the
Count value
at the time
of the read. Gives the
Count value at
the time read. Gives count
value
reflecting
measurement Gives count
value
reflecting
pulse
measured Gives count
value
reflecting
period
measured Gives count
value
reflecting
position
measurement
Interrupt On Edge
Transitions On
Terminal
Count of 0 Upon reach of
count limit Upon end of
enable pulse Upon end of
pulse
measurement Upon end of
period
measurement On Index or
Constant A
count limit.