Campbell Scientific CR10X Measurement and Control System - Manual (Page 29)

CR10X OVERVIEW
OV-17
provide a range of +2500/40 = +62.5 o C (i.e.,
this scale will not overrange as long as the
measuring junction is within 62.5
o C of the
panel temperature). The resolution of the ± 2.5
mV range is 0.33 µV or 0.008 o C.
Parameter 3 is the analog input channel on
which to make the first, and in this case only,
measurement.
Parameter 4 is the code for the type of
thermocouple used. This information is located
on the Prompt Sheet or in the description of
Instruction 14 in Section 9. The code for a type
T (copper-constantan) thermocouple is 1.
Parameter 5 is the Input Storage location in
which the reference temperature is stored.
Parameter 6 is the Input Storage location in
which to store the measurement (or the first
measurement; e.g., if there are 5 repetitions
and the first measurement is stored in location
3, the final measurement will be stored in
location 7). Parameters 7 and 8 are the
multiplier and offset. A multiplier of 1 and an
offset of 0 outputs the reading in degrees C. A
multiplier of 1.8 and an offset of 32 converts the
reading to degrees F.
In this example, the sensor is measured once a
minute, and the day, time, and average
temperature are output every hour. Once a day
the day, time, maximum and minimum
temperatures and the times they occur will be
output.
Final Storage data will be sent to Storage
Module. Remember, all on-line data output to a
peripheral device is accomplished with
Instruction 96 (Sections 4.1 and 12).
The first example described program entry one
keystroke at a time. This example does not
show the "A" key. Remember, "A" is used to
enter and/or advance (i.e., between each line in
the example below). This format is similar to
the format used in EDLOG.
It's a good idea to have both the manual and the
Prompt Sheet handy when going through this
example. You can find the program instructions
and parameters on the Prompt Sheet and can
read their complete definitions in the manual.
To obtain daily output, the If Time instruction is
again used to set the Output Flag and is
followed by the Output Instructions to store time
and the daily maximum and minimum
temperatures and the time each occurs.
Any Program Control Instruction which is used
to set the Output Flag high will set it low if the
conditions are not met for setting it high.
Instruction 92 in sample program 2 sets the
Output Flag high every hour. The Output
Instructions which follow the second Instruction
92 do not output every hour because the
second Instruction 92 sets the Output Flag high
at midnight (and sets it low at any other time).
This is a unique feature of Flag 0. The Output
Flag is set low at the start of each table (Section
3.7).
OV5.3 EDITING AN EXISTING PROGRAM
When editing an existing program in the
CR10X, entering a new instruction inserts the
instruction; entering a new parameter replaces
the previous value.
To insert an instruction, enter the program table
and advance to the position where the
instruction is to be inserted (i.e., P in the data
portion of the display) key in the instruction
number, and then key A. The new instruction
will be inserted at that point in the table,
advance through and enter the parameters.
The instruction that was at that point and all
instructions following it will be pushed down to
follow the inserted instruction.
An instruction is deleted by advancing to the
instruction number (P in display) and keying #D
(Table 4.2-1).
To change the value entered for a parameter,
advance to the parameter and key in the correct
value then press A. Note that the new value is
not entered until A is keyed.