National Instruments cFP-TC-125 Temperature Input Module for Compact FieldPoint
The NI cFP-TC-125 (Part Number: 777318-125) can be mounted on a cFP-BP-x or cFP-180x Compact FieldPoint backplane. This results in delivering functioning power to the module. This module has built-in linearization and cold-junction compensation for eight types of thermocouples: B, J, E, R, K, S, N, and T. In addition, the cFP-CB-x Connector Block has connections for the eight differential input channels on the NI cFP-TC-125 module. The user should keep in mind that they should not link anything to the V and C terminals on the connector block.
Each of the eight channels on the cFP-TC-125 Temperature Input Module rejects as much as ±250 V common-mode voltage as referenced to earth ground. However, the user must ensure the difference in common-mode voltage between any two channels does not go over 250 V. To link voltage input signals, the user should link the positive lead of a millivolt signal to the IN(+) terminal and the negative lead to the IN(-) terminal. The voltage input range is from -20 to 80 mV. An input signal not falling within this range will result in the NI cFP-TC-125 module reporting an Out of range error for the affected channel. Additionally, if the user chooses the -20 to 80 mV range for an input channel in software, then choosing a thermocouple type for that channel will not change anything.
The National Instruments cFP-TC-125 Temperature Input Module senses open thermocouples on channels arranged for temperature ranges. When the module notices an open thermocouple, the NI cFP-TC-125 will show an Open thermocouple error for the corresponding channel and will light the matching red LED.
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