Sdm-A04 Analog Output Multiplexer To Strip Chart - Campbell Measurement and Control Module CR10 Operator's Manual
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8.6 SDM-A04 ANALOG OUTPUT
MULTIPLEXER TO STRIP CHART
This example illustrates the use of the SDM-
A04 4 Channel Analog Output Multiplexer to
output 4 analog voltages to a strip chart.
While of questionable value because of current
requirements and strip chart reliability, some
archaic regulations require strip chart backup
on weather data. The SDM-A04 may be used
with the CR10 to provide analog outputs to strip
charts. The output values in this example are
wind speed, wind direction, air temperature,
and solar radiation.
Instruction 103 is used to activate the SDM-
A04. The (4) millivolt values to output must be
stored in adjacent Input Storage locations, the
first of which is referenced in Instruction 103.
The following program measures the sensors
every 5 seconds. The readings are moved to
another 4 locations and scaled to a 0 to 1000
millivolt output for the SDM-A04. Wind
direction is changed from a 0-360 degree input
to output representing 0 to 540 degrees. This
conversion is done in a subroutine which is
described in the next example.
The example also includes instructions to
output wind vector and average temperature
and solar radiation every hour.
Input Location Labels:
1:WS
2:0-360 WD
3:Ta
4:SR
5:WS output
6:0-540 out
7:Ta output
8:SR output
10:0-540 WD
*
1
01:
5
01:
P3
01:
1
02:
1
03:
22
04:
1
05:
1.789
06:
1
SECTION 8. PROCESSING AND PROGRAM CONTROL EXAMPLES
Table 1 Programs
Sec. Execution Interval
Pulse
Rep
Pulse Input Chan
Switch Closure
Loc [:WS
]
Mult
Offset
02:
P4
Excite,Delay,Volt(SE)
01:
1
Rep
02:
14
250 mV fast Range
03:
1
IN Chan
04:
1
Excite all reps w/EXchan 1
05:
5
Delay (units .01sec)
06: 1000
mV Excitation
07:
2
Loc [:0-360 WD ]
08:
.7273
Mult
09:
0
Offset
03:
P11
Temp 107 Probe
01:
1
Rep
02:
2
IN Chan
03:
2
Excite all reps w/EXchan 2
04:
3
Loc [:Ta
05:
1.8
Mult
06:
32
Offset
04:
P1
Volt (SE)
01:
1
Rep
02:
2
7.5 mV slow Range
03:
3
IN Chan
04:
4
Loc [:SR
05:
.14493 Mult
06:
0
Offset
05:
P92
If time is
01:
0
minutes into a
02:
60
minute interval
03:
10
Set high Flag 0 (output)
06:
P54
Block Move
01:
4
No. of Values
02:
1
First Source Loc WS
03:
1
Source Step
04:
5
First Dest. Loc [:WS output]
05:
1
Destination Step
07:
P86
Do
01:
1
Call Subroutine 1
08:
P53
Scaling Array (A*loc +B)
01:
5
Start Loc [:WS output]
02:
10
A1 SCALE WS,
0-100 MPH = 0-1000 MV
03:
0
B1
04:
1.8519
A2 SCALE WD,
0-540 DEG = 0-1000 MV
05:
0
B2
06:
5.7143
A3 SCALE TEMP,
-25 - 100 F =0-1000 MV
07:
25
B3
08: 1000
A4 SCALE RADIATION,
0-1KW/M^2 = 0-1000 MV
09:
0
B4
]
]
8-7
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