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        • Lifecycle Status

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          Prevent unexpected downtime for your critical control infrastructure by integrating this verified Metso module, provided by Apter Power to ensure reliable system monitoring.

        IOP331

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        Mesto IOP331 is a 48 V common input module with 16 input channels for industrial digital signal acquisition, status monitoring, and reliable communication with the DPU.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for IOP331

        • Manufacturer:
          Metso Auttomation
        • Part Number:
          IOP331
        • Product Family:
          Metso Auttomation
        • Product Type:
          48V Common Input Module
        • Stock:
          1
        • Rated Input Voltage:
          48 Volts nominal, 60 Volts maximum
        • Input current per point:
          5 mA @ 48 Volts
        • On-State Voltage:
          22 Volts
        • Isolation (User input to logic):
          250 VAC continuous, 1,500 VAC for 1 minute
        • Indicators:
          1 LED per point provides status indication. LED provides power and communication indication. LED provides loop power disconnect status
        • I/O Bus Address:
          One address
        • Input Power (from 24V system supply):
          50 mA
        • Weight:
          0.56 kg
        • Estimated shipping dimensions:
          4.3x31.5x25.6cm
        • Tariff Code:
          8537101190
        • Country of origin:
          Germany
        • Place of shipment:
          Xiamen, Fujian, China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Specifications Application Scenarios Efficiency Safety

        Features:

        • Supports 16 common digital input channels with a nominal 48 V input and 60 V maximum input voltage.
        • Provides optical isolation, individual channel LEDs, Active communication indication, and loop power fuse status monitoring.
        • Transfers buffered 16-bit input data to the DPU through a single I/O bus address with watchdog-controlled communication monitoring.
        Mesto IOP331 provides a dependable interface between field devices and industrial control systems by acquiring digital input signals through 16 common input channels. Signal conditioning circuitry performs filtering, current limiting, and threshold detection before transmitting the processed information to the DPU. This architecture supports stable operation in demanding automation environments where accurate input monitoring is essential.

        With a nominal input voltage of 48 V and a maximum rating of 60 V, Mesto IOP331 is suitable for a wide range of industrial digital input applications. Optical isolation protects the logic circuitry from field-side electrical interference, while a buffered I/O interface presents data as a 16-bit word during each DPU scan. The module consumes only 50 mA from the 24 V system supply, contributing to efficient system operation.

        Mesto IOP331 is engineered for convenient maintenance and system diagnostics. Front-panel LEDs allow operators to monitor every input channel, module communication, and loop power status at a glance. Installed with a single I/O bus address, the module is well suited for industrial process control, distributed automation systems, equipment monitoring, and other applications requiring reliable digital input acquisition.

        The IOP331 Mesto 48V Common Input Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Mesto IOP331 48V Common Input Module Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        Mesto IOP331 48V Common Input Module Specs

        General

        • Manufacturer Mesto
        • Model IOP331
        • Condition New Original ready stock
        • Product Family IOP330,IOP334, IOP332
        Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        • Substation automation: Used for monitoring the status of power grid switches and relay protection.
        • Rail transit: Suitable for 48V DC control of locomotives and signaling systems.
        • Heavy Industrial Manufacturing: Distributed I/O for metallurgical and papermaking production lines.
        • Energy Management: Signal feedback for wind power and solar grid-connected systems.
        • High-speed sampling: Significantly reduces I/O cycle response time.
        • Energy-saving architecture: Low-power design reduces cabinet heat generation.
        • Optimized density: Single module with multiple channels saves installation space.
        • Intelligent filtering: Automatically eliminates front-end mechanical contact jitter.
        • Electrical isolation: High-strength opto-isolation between channels.
        • Fault-tolerant design: Supports automatic protection against channel short circuits and overvoltages.
        • Hot-swappable: Supports live replacement without affecting system operation.
        • Status monitoring: Built-in LED displays single-channel operational faults in real time.
        Description
        Mesto IOP331 is a 48 V common input module that provides 16 digital input channels for industrial automation systems. The module receives field input signals, conditions them through filtering and current limiting circuitry, and transfers the processed data to the DPU through the I/O bus interface. Each channel operates with a nominal input voltage of 48 V and supports a maximum input voltage of 60 V.

        Operating with an input current of 5 mA at 48 V and an on-state voltage of 22 V, Mesto IOP331 delivers dependable signal detection for industrial control applications. Optical isolation separates the field wiring from the logic circuits, providing continuous isolation of 250 VAC and 1,500 VAC for one minute. Buffered input data is transferred to the I/O bus as a 16-bit word whenever the module is scanned by the DPU, ensuring efficient communication within the control system.

        Mesto IOP331 includes comprehensive status indication to simplify operation and maintenance. Individual red LEDs on the front panel display the status of each input channel, while a green Active LED indicates system power and communication with the DPU. When the module is not scanned for approximately 0.7 seconds, the watchdog timer causes the Active LED to blink. A second green LED provides clear indication of the loop power fuse disconnect status.

        Designed for convenient installation, Mesto IOP331 occupies one I/O bus address with a digital input address range from 0 to 1F (0–31). Loop power signals for 24V/48V (+) and 24V/48V (-) are distributed to all channels through a front-accessible fused disconnect connected from the backplane. Drawing only 50 mA from the 24 V system supply, the module offers reliable performance for industrial automation, process monitoring, and distributed control applications.
        Alternative Names
        IOP33I I0P331 IOP330 IOP334 IOP332 IOP335 IOP350 IOP371
        Technical notes
        Engineered for space-constrained cabinets, the Mesto IOP331 48V module minimizes power consumption to just 1.2W under full load while maintaining 99.9% signal fidelity. This smart I/O component optimizes processing efficiency by offloading de-bounce filtering directly onto the hardware layer.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        How does Mesto IOP331 indicate operating status?
        Individual red LEDs display the status of each input channel, while green LEDs indicate module activity, communication with the DPU, and loop power fuse disconnect status.
        Can Mesto IOP331 detect communication interruptions?
        Yes. A built-in watchdog timer causes the Active LED to blink whenever Mesto IOP331 has not been scanned by the DPU for approximately 0.7 seconds.
        Does Mesto IOP331 require a dedicated I/O bus address?
        Yes. Mesto IOP331 occupies one I/O bus address, and digital input modules use an address range from 0 to 1F (0–31).
        What power requirements does Mesto IOP331 have?
        Mesto IOP331 draws 50 mA from the 24 V system supply and distributes 24V/48V (+) and 24V/48V (-) loop power signals to all 16 input channels through a fused backplane connection.

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