GFK-1504K Chapter 14 Temperature-Sensing Modules 14-11
14
IC200ALG630
Analog Input, 16 Bit Thermocouple, 7 Channels
Module Operation
The Thermocouple Input Module accepts seven inputs from thermocouples and converts
them to digital values. The module supports a variety of thermocouple types.
The module converts each analog voltage into a binary (15 bits plus a sign bit) value
representing tenths (1/10) of degrees Celsius or Fahrenheit. The result is read by the
module’s microprocessor. The microprocessor determines if the input is over or under its
configured range, or if an open thermocouple condition exists.
Each input can be configured to report data as millivolt or temperature (tenths of degrees
Celsius or Fahrenheit) measurements. When thermocouple inputs are measured, the
module can be configured to monitor the thermocouple junction temperature and correct
the input value for cold junction. If the module is configured to measure millivolts, the
result of the analog-to-digital conversion is a value reported in hundredths (1/100) of
millivolts (625mV range reports tenths of millivolts).
The module automatically performs A/D calibration at powerup. Automatic calibration is
then repeated periodically to compensate for changes in the ambient temperature. New
calibration values are filtered into the current calibration values.
Host Interface
The Thermocouple Input module uses the following data types:
7 words of analog input data.
7 optional words of analog output data.
The module exchanges data in the same manner as other types of I/O modules: it provides
all its input data when requested.
Compatibility
This module is compatible with:
VersaMax PLC CPU version IC200CPU001-BC firmware version 1.20 or later.
Genius NIU version IC200GBI001-AB Firmware version 1.10 or later
Profibus NIU version IC200PBI001-BB firmware version 1.10 or later
DeviceNet NIU version IC200DBI001-AA Firmware version 1.10 or later
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