GFK-1504N
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 °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
°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
Ethernet NIU version IC200EBI001-AA Firmware version 1.00 or later
