The IC693ALG220 4-Channel Analog Voltage Input Module is perfect for technicians working with PLC systems that require analog voltage inputs to be converted to digital signals. Let’s break down how this module operates:

Input Voltage Range:
    The module handles voltage inputs between –10 and +10 volts, making it versatile for many industrial applications. It converts analog signals into digital ones that the PLC can process with a 12-bit resolution (1 part in 4096).

Conversion Speed:
    Conversion on each channel happens in 1 millisecond, meaning all four channels get updated every 4 milliseconds. This ensures that your data is always up-to-date and accurate in real time.

Current Input Mode:
    A cool feature is the ability to use the module for limited current input as well. By adding a jumper on the terminal, you can use an internal 250-ohm shunt resistor to measure current, offering a range of –40 to +40 mA. For standard 4 to 20 mA inputs, this corresponds to a voltage range of 1 to 5 volts, giving you a resolution of 10 bits. If you use a precision external resistor, you can boost the resolution even further.

Power Supply and Protection:
    The module draws power from the PLC's +24 VDC supply and uses 27 mA from the +5 VDC rail. It’s got optical isolation to shield the PLC from noise, and it provides 1500V of isolation between the field side and logic side, ensuring safety and preventing signal interference.

Connections and Wiring:
    For best performance, always use twisted, shielded instrumentation cables for wiring. You can connect the shield to the COM or GND pin on the module for better noise rejection. Also, make sure to connect unused input terminals together to prevent noise from affecting the analog input table.

Performance:
    This module offers a high resolution of 5 mV for each input (1 LSB = 5 mV). It’s also very accurate, with a typical error of only ±10 mV across the operating temperature range. Cross-channel rejection is excellent at 80 dB, meaning that signals from one channel won’t interfere with another.

Installation:
    You can install this module in any I/O slot of a 5- or 10-slot baseplate in a Series 90-30 PLC system. The number of modules you can use depends on your system's capacity.

    In summary, the IC693ALG220 is a robust, accurate, and reliable module for converting analog voltage inputs to digital signals in PLC systems. Whether you're dealing with voltage or limited current inputs, this module will keep your system running smoothly.

>> IC693ALG220 User manual (pdf)

++ Other 90-30 PLC modules

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