Accuracy; Digital Word Map; Figure 7 2500C-8-Tc Accuracy Rating Table; Figure 8 2500C-8-Tc Digital Word Map Diagram - Control Technology 2500 Series Installation And Operation Manual

1.7 Accuracy

The module measurement accuracy is listed below for each Thermocouple Type and
millivolt signals:
Accuracy :
Thermocouple Types and mV

1.8 Digital Word map

Thermocouple and/or millivolt signals are translated into a 15-bit plus sign digital word.
Since the PLC requires a 16-bit input word, the 15-bit value from the converter is placed into
a 16-bit word for transmittal to the PLC, the extra bit being used to show the sign of the
value.
The data is reported to the PLC in the format shown below:
Sign bit 16,384 8192 4096

Figure 8 2500C-8-TC Digital Word Map Diagram

In addition to applying a basic scale of 0-32000, the module provides a over-range error
value of 32765 or under-range error value of 32766.
10

Figure 7 2500C-8-TC Accuracy Rating Table

2048 1024 512 256
J : +/-1ºC from 0ºC to 60ºC
K: +/-1ºC from 0ºC to 60ºC
T: +/-1ºC from 0ºC to 60ºC
E: +/-1ºC from 0ºC to 60ºC
R: +/-2ºC from 0ºC to 60ºC*
S: +/-2ºC from 0ºC to 60ºC*
N: +/-1ºC from 0ºC to 60ºC
mV: +/-0.5% full scale or +/- 500µV
* reduced accuracy for measurements
below 500ºC
128 64 32
2500C-8-TC Installation and Operation Guide
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