Best Analog and Discrete I / O Modules for 2020

Automation of technological processes is an integral part of any enterprise or professional field. The computer is capable of processing gigabytes of information in a few seconds. Because of this, the risk of emergencies is reduced, and the volume of manufactured goods also increases. However, it is important to choose the right device and pay attention to each element. The editors of the site "bestx.htgetrid.com/en/" have prepared for you a rating of the best analog and discrete input / output modules for 2020.

Purpose of the device

The I / O module is the central element that connects to the programmable logic controller. The main task of the device is to provide a strong connection between an execution object (for example, a technological machine) and a computer. Voltage or current is one of the inputs to the PLC. They convey the state of a device in real time or provide physical variables necessary for correct operation.

The modules contain discrete and analog inputs / outputs. Special connectors are also available to ensure safe connection. Which type you need to use depends on the signal source. In some cases, only an analog or discrete device is allowed.

Digital (discrete) I / O is capable of working only with switching devices or electric motors and relays. Analog, on the other hand, includes physical variables that are constantly transmitted to the PLC, receiving in real time, which reduces delays to a minimum. In other words, an analog device connects sensors (eg pressure, temperature, humidity, etc.) to a programmable device. Therefore, memory plays an important role here, especially when several devices are connected, otherwise serious delays are possible.

Standard ranges for analog signals are 4-20 mA, and devices with 0-20 mA are also found. However, the recommended voltage is 0-10 V. These are typical ranges found in every industry standard. Therefore, you should look for a device based on these readings.

Integration method

The device can be fully integrated into a programmable logic controller or distributed. Integrated I / O is often found in rack systems, but is also found in the PLC chassis. The opposite situation is in distribution systems, the device is installed next to the object of execution, which has a positive effect on the quality and speed of signal processing.

Another important point when installing a module is knowing the requirements of special programs. They determine what type of signal is needed and how many points the system will need to work correctly over a long period.

Several manufacturers produce PLCs with expansion modules. This makes it possible to connect a large number of different signals to the device. The advantage of this design is variability according to application requirements, and it takes less time for the operator to create the necessary working conditions.

Application area

Digital and analog input and output modules are used in all areas of automation. It can be housing and communal services, mass production, petrochemical complexes, and even in the "Smart House" system. Each device differs in technical features and purpose, which should also be taken into account, since some are suitable for factories, while others are used only at home.

Rating of the best analog I / O modules

XIOC-2AI-1AO-U1

The device has compact dimensions and can be placed in a convenient place without taking up space. The device is not intended to function in security systems, therefore it cannot be used in an ACS.

The number of analog inputs / outputs is 2 and 1, respectively. The conversion time is 1 ms, and there is also the possibility of switching separately. Operated at temperatures from -25 to 70 degrees. The vibration resistance level is average and equal to 10-57 Hz.

Impact resistance, also does not differ in special technical indicators, so it is better to avoid constant mechanical stress. The housing is made of durable plastic, the degree of protection is IP20. Terminals can be screw or spring-loaded, this parameter depends on user preference.

Sold at a price of 25,900 rubles.

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ioLogik E2242

Professional device that can be mounted on a wall or DIN rail. There is one RS-485 connector. There is also support for network ports, which greatly simplifies operation. The number of analog input is 4. The operating range of the signal is 0-500 mV, for current - 0-20 mA.

A distinctive feature of the product is its high measurement accuracy, which is 0.1%. The device operates on the ioAdmin proprietary operating system. The configuration method is standard - conditional logic. Powered by an alternating voltage of 12 ... 36 V.

It can be used at negative temperatures, down to -40 degrees, while the relative percentage of humidity should not exceed 95%, otherwise there is a possibility of premature failure of the device. Vibration Standards - IEC 60068-2-6.

It is sold at a price of 48,000 rubles.

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Siemens SIMATIC 6ES7234-4HE30-0XB0

The module is designed to operate in standard industrial environments where temperatures do not drop below zero. There are 4 entrances and 2 exits. Analog sensors are connected directly, no additional amplifiers are required.

The software setting makes it possible to independently select the frequency, the type of input signals, the degree of smoothing, etc. The product is housed in a robust plastic casing that can withstand vibration and mechanical stress. Protection degree - IP20.

The device can be placed on a standard rail, and can also be mounted on a PCB. The module is capable of serving up to 51 analog channels, which is an excellent result for such equipment. It is recommended to use a four-channel CSM 1277 switch and a special power supply unit that will supply the product with electric current.

It is sold at a price of 26 900 rubles.

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EATON XN-322-8AO-U2

A good analog device with 8 outputs, which is characterized by high accuracy and performance. Recommended relative humidity is 0-95%. The product is able to withstand negative temperatures without losing its positive characteristics. Protection class - IP20.

Placed horizontally. Overvoltage category - III.Connection method - spring terminal, which is a convenient design. The accuracy of the final value is 0.5%. Powered by AC voltage. The product can be mounted on a rail.

Sold at a price of 30,000 rubles.

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MOXA 85M-3810-T

The product is sold in a metal case and has 8 analog inputs. The input signal range is 0 ... 10 V. The approximate measurement accuracy is 0.1%. Connector type - screw terminals. The product can be operated at a temperature of -40 ... 75 degrees.

Input impedance - 200 kOhm. The maximum insulation voltage is 3 kV. The module has good resistance to mechanical stress and is able to function for a long time without interruptions. The signal is processed in a few milliseconds. The equipment can only work with ioPAC controllers. This is the only drawback.

It is sold at a price of 52,000 rubles.

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Rating of the best discrete devices

ARIES MK210-301

The device is designed to control the signal using Ethernet. The inputs can function in various modes up to 100 kHz. The device is configured using a special configurator. This allows quick access to all parameters.

The connection can be carried out using the USB connector, which is a convenient solution, since no additional power is required. In addition, the device supports a proprietary cloud service, which simplifies operation.

It is produced in a durable plastic case that has good weather protection. The equipment is used both at normal temperatures and at negative temperatures. The outputs are capable of operating in the generation mode. There is control over the break of loads.

The average price is 7,900 rubles.

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MOXA ioLogik E2214

A discrete device that comes in a plastic case and is able to withstand various temperatures. There is a connector for Ethernet connection. Fits on a DIN rail or wall. The number of channels is 6.

The information transfer rate reaches 115,200 bits per second, which is a good result for such a device, while the error is minimal. Works on Modbus protocols. For convenience, there is a Click & Go Logic control. The pulse generator is capable of up to 20 switching per minute.

The average cost is 38,000 rubles.

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ARIES MK100-224.8DN.4R

An excellent module for controlling connected actuators. Also, the product collects all information and transmits it to the network. The built-in input connectors are capable of operating in pulse counter mode.

For convenience, there is a line break diagnostics and automatic protocol detection. Like most of the OWEN products, a branded cloud service is supported, where information is sent. The equipment is configured using the appropriate configurator, which is connected through special adapters.

The average cost is 6 600 rubles.

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SIMATIC S7-200, EM 223

A quality device designed for CPU222, 226XM, 224. Separation of external and internal areas is carried out by galvanic method. There are 4 inputs and 8 outputs on the case. The nominal value of direct current is 24 V. The dimensions of the module are small, which makes it easy to place it in the wall. The maximum current per conductor is 3 A.

The average price is 20,000 rubles.

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Top 2 universal modules

Allen-Bradley FLEX 5000

Great product that supports analog and discrete I / O. Designed to measure various signals, as well as voltage, frequency, etc. The principle of operation of the device is the same as that of most analogs and is based on converting the received signals into a digital code that can be understood by a computer program.

The product is manufactured to function with proprietary controllers. The product is configured using special software (the disc is included in the kit). To connect accessories, you must use the terminal base.

The device is manufactured in a plastic case, which is highly reliable and resistant to mechanical stress. The dimensions are compact, which makes it possible to place it in a convenient place. The weight of the structure is 120 grams.

The cost is specified when ordering.

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BOLID М2000-4DA

The equipment is manufactured in accordance with the ATsDR.421459.001 specifications, which indicates quality and durability. The module is designed to function in automation systems. The main purpose is to convert the measured signals into a special code.

It is necessary to place the structure in a closed room. The module is designed for trouble-free operation. The degree of protection is the same as that of most modern products - IP20. It is produced in a plastic case and has a small size, which makes it possible to mount on a DIN rail.

There are two modes of operation - service and main. The first is necessary for timely software updates. Reception and transmission of information occurs using a special RS-485 interface.

The average cost is 2,200 rubles.

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Finally

A lot of time has been devoted to automation lately. Manufacturers produce a variety of devices that do complex jobs. If you have experience using the models described in the rating, or other models, tell us about it in the comments.