Campbell CR23X Spécifications Page 139

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Vue de la page 138
SECTION 9. INPUT/OUTPUT INSTRUCTIONS
9-5
less than 4 seconds, control ports C5..C8
measure frequency much more precisely than
do pulse channels.
Pulse Channels
Hz = counts / Execution Interval
Maximum Error (Hz) = ±[1/(Execution
Interval - 50 µs)]
Control Ports
Hz = counts / measured time (±0.5 µs)
since previous measurement
Error if Execution Interval < 4.0 s
Maximum Error (Hz) =
±(0.5 µs)(Frequency)
2
Error if Execution Interval 4.0 s
Maximum Error (Hz) =
±[1/Execution Interval]
If there have been no new counts during the
scan interval (since last monitored), the
previous frequency is returned to the input
location. If it has been 4 seconds since a new
count has occurred, the 0 is returned to the
input location.
TABLE 9-2 Pulse Count Configuration
Codes
Code Configuration
x0 High Frequency Pulse
(8 bit counter)
x1* Low Level AC
x2 Switch Closure
x3* High Frequency
(16 bit counter)
x4* Low Level AC
(16 bit counter)
0y No Change
1y Long interval counts discarded
2y Long interval counts discarded/
Frequency (Hz) output
xy* 10 Hz reset
xy--*† 100 Hz reset
* Options Applicable to Channels P1 to P4 Only
† 100 Hz reset only used with 8 bit counter
Example: 24-- Selects 16 bit, 100 Hz reset, Low Level
AC with a frequency output.
PARAM. DATA
NUMBER TYPE DESCRIPTION
01: 2 Repetitions
02: 2 Pulse channel or
Control Port number for
first measurement
03: 2 Configuration code
(from above table)
04: 4 Input location for first
measurement
05: FP Multiplier
06: FP Offset
Input locations altered: 1 per repetition
TABLE 9-2A. Excitation Channel Options
0X Excite all reps with channel X
1X Increment channel with each rep
*** 4 EXCITE, DELAY, AND MEASURE ***
FUNCTION
This instruction is used to apply an excitation
voltage, delay a specified time, and then make
a single-ended voltage measurement. A 1
before the excitation channel number (1X)
causes the channel to be incremented with
each repetition.
Ranges 41-45 and 51-55 (Section 13.1) do not
have enough time between integrations to allow
a delay.
PARAM. DATA
NUMBER TYPE DESCRIPTION
01: 2 Repetitions
02: 2 Range code (Table 9-1)
03: 2 Single-ended channel
number for first
measurement
04: 2 Excitation channel
number (Table 9-2A)
05: 4 Delay in hundredths of
a second
06: 4 Excitation voltage
(millivolts)
07: 4 Input location number
for first measurement
08: FP Multiplier
09: FP Offset
Input locations altered: 1 per repetition
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