Operator`s manual

SECTION 8. PROCESSING AND PROGRAM CONTROL EXAMPLES
8-6
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 21X to provide an additional four continuous
analog outputs for 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 Assignments:
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 Table 1 Programs
01: 5 Sec. Execution Interval
01: P3 Pulse
01: 1 Rep
02: 1 Pulse Input Chan
03: 22 Switch closure; Output Hz.
04: 1 Loc [:WS ]
05: 1.789 Mult
06: 1 Offset
02: P4 Excite,Delay,Volt(SE)
01: 1 Rep
02: 14 500 mV fast Range
03: 1 IN Chan
04: 1 Excite all reps w/EXchan 1
05: 2 Delay (units .01sec)
06: 1000 mV Excitation
07: 2 Loc [:0-360 WD ]
08: .72 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: P2 Volt (DIFF)
01: 1 Rep
02: 2 15 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 Destination 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
03: 0 B1
04: 1.8519 A2
05: 0 B2
06: 8 A3
07: 25 B3
08: 1000 A4
09: 0 B4
09: P103 SDM-A04 (OSX-0,-1)
01: 4 Reps
02: 30 Address
03: 5 Loc WS output
10: P92 If time is
01: 0 minutes into a