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Description：

The 1771-NIS/C is an I/O module which belongs to the 1771-N high resolution I/O module series. It is equipped with 8 current input channels rated for 4-20mA. The 1771-NIS/C module provides power for the input circuit loops. The current drawn by the 1771-NIS/C from the I/O chassis backplane is 2.4A and the total power dissipated is 12W. The 1771-NIS/C interfaces with PLC-5/250, PLC-3 and PLC-5 controllers.

The current range supported by the 1771-NIS/C’s input channels is 0.1 – 21mA. The resolution for the input channels is 330nA/bit (at 16 bits unipolar) with the impedance at the input being a maximum of 300ohm. The module-supplied loop power is 20 – 30V DC (0 to 20mA range). The 1771-NIS/C module needs a maximum of 5s to detect an open input circuit and it provides 24V DC overvoltage protection. A range of 50 dB to 60 dB provides the values for normal mode rejection whereas the typical common mode rejection is 150 dB. The value for the offset drift is ±200nA/°C whereas the value for the gain drift is ±95 ppm/°C. The update time per module is a maximum of 25s and the bandwidth range at input channels is 9 Hz. The under-range and over-range limit values are 3.2mA and 21mA, respectively. The values for the 1771-NIS/C’s input channel calibration are 1 mA / 21 mA.

Specification：

Frequently asked questions

Q1: What is the 1771-NIS/C Input Module used for?

A1: The 1771-NIS/C Input Module is an analog input module designed for PLC systems. It receives and processes current signals from field instruments such as transmitters, sensors, and process control devices, enabling accurate monitoring of industrial processes.

Q2: How many input channels does the 1771-NIS/C module provide?

A2: The module features 8 analog input channels, allowing multiple field devices to be monitored simultaneously.

Q3: What input signal range does the 1771-NIS/C module support?

A3: The 1771-NIS/C supports 4–20 mA current input signals, which are widely used in industrial instrumentation and process control applications.

Q4: What is the 1771-NIS/C backplane current requirement?

A4: The 1771-NIS/C module draws 2.9 A of backplane current, which should be considered when calculating total chassis power requirements.

Q5: Why is the 1771-NIS/C 4–20 mA signal standard commonly used in industrial systems?

A5: The 1771-NIS/C 4–20 mA signal standard provides excellent noise immunity, supports long-distance transmission, enables fault detection, and delivers reliable process measurements in industrial environments.

Product Applications

Oil and Gas: Used to monitor the status of oil and gas pipelines and refinery equipment.

Chemical and Petrochemical Industry: Accurately reads 4-20 mA transmitter signals for temperature, pressure, and flow rate in reaction vessels.

Power Generation and Energy: Monitors analog sensor data from power plant boilers, turbines, and auxiliary systems.

Water and Wastewater Treatment: Transmits water quality, level, and flow meter data over long distances to a central control system.