Campbell Scientific CR7 Measurement and Control System User Manual
Page 21
CR7 MEASUREMENT AND CONTROL SYSTEM OVERVIEW
OV-11
TABLE OV4-1. Thermocouple Measurement Programming Example
TURN ON THE POWER SWITCH AND PROCEED AS FOLLOWS:
Display
ID:Data
Key
Display
ID:Data
Key
Description
HELLO 01
00:00
01:0.0000
1
2
:0064
01:00
01:2
*
A
A
The number after "HELLO" will count up as memory
is checked. If you have a 512K Memory Card, this
can take a long time; key # to abort the test. The
result of the CPU board memory check is then
displayed (Sect. 1.5)
Enter Program Table 1, advance to Execution
Interval
Enter 2 second Execution Interval advance to first
instruction
-------Users without RTD omit next Instruction------
01:P00
01:00
02:0000
17
1
1
01:P17
01:1
02:1
A
A
A
Measure Panel Temp., advance to first Parameter
RTD in input card #1, if RTD card other than #1,
enter correct card #
Store temp in location 1
-------Users without RTD continue here-------
Instruction Location Number will be 1 less (i.e., 01:P00)
02:P00
01:00
02:00
03:00
04:00
05:00
06:0000
07:0000
08: 0.0000
09: 0.0000
03:P00
00:00
14
1
2
1
5
1
1
2
1
0
02:P14
01:1
02:2
03:1
04:5
05:1
06:1
07:2
08:1
09:0.0000
:LOG 1
A
A
A
A
A
A
A
A
A
A
*
TC temp., differential meas.
1 repetition
Range code (5000uV, slow)
Input card #1
Input channel of 1st TC
TC type (copper-constantan)
Reference temp. is in location 1
Store TC temp. in location 2
Multiplier of 1
No offset entered (offset=0), advance to next
instruction
Exit Table 1
Enter *0 Mode, compile table
The CR7 is now programmed to measure the thermocouple temperature and to store the result in Input
Storage Location 2. The colon between the ID and Data fields blinks each time Table 1 is executed,
every 2 seconds in this example. If you do not have an RTD, the "reference temperature" is 0.0 and the
value stored in Location 2 is the difference in temperature between the panel and the thermocouple. The
*6 Mode can be used to monitor the values in the Input Storage and to change the value of the dummy
reference temperature.