Omron CRT1 - 10-2009, Operation Manual

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365
Temperature Input Units
Section 7-1
Note Data will be undefined if default values are set using the CX-Integrator or
other Support Software.
7-1-3 Temperature Input Unit Display Modes
Temperature Input Units have two Display Modes: normal and 1/100 display.
Normal Display Mode
(Default Setting)
The input temperature data is converted to 4-digit hexadecimal digital data
and transmitted to the Master Unit. If the conversion data is negative, the neg-
ative value is expressed as the two's complement.
Four words are allocated in the Master Unit for the four inputs, as shown in the
following diagram. If the data for the input type contains a digit below the dec-
imal place, the value sent to the master will be 10 times the actual value. (The
decimal point is omitted.)
• Example 1: R type thermocouple at 1,000
°
C
1,000 converted to hexadecimal
→
03E8 hex
• Example 2: U type thermocouple at 350.0
°
C
350
×
10 = 3,500 converted to hexadecimal
→
0DAC hex
1/100 Display Mode
The input temperature data for all input types is transmitted to the Master as
data with precision to 0.01 digits. The temperature data is multiplied by 100
and converted to 8-digit hexadecimal digital data (four long values).
If the conversion data is negative, the negative value is expressed as the two’s
complement.
3 0 2 1 4 6 5 7 8 10 9 11 12 14 13 15
First word + 0CH Input CH0 Temperature conversion data
First word + 1CH Input CH1 Temperature conversion data
First word + 2CH Input CH2 Temperature conversion data
First word + 3CH Input CH3 Temperature conversion data