ARC‘s latest research shows that I/O modules are taking on a more strategic role in discrete automation as manufacturers move toward more connected, intelligent, and flexible production architectures. Positioned between field devices, controllers, and higher-level systems, I/O modules provide the essential link between physical equipment and digital operations. Demand weakened in 2025 as manufacturers reduced capital spending and favored modernization over major capacity additions. However, this shift also reinforced the importance of I/O modules in brownfield upgrades, decentralized control, and data-driven manufacturing. With the market expected to return to growth in 2026, suppliers are increasingly differentiating their offerings through I/O-Link, industrial Ethernet, edge processing, diagnostics, and application-specific designs. These capabilities are moving I/O modules beyond basic signal handling and making them an increasingly important component of resilient and adaptable automation systems.
"I/O modules are quietly becoming the backbone of the smart factory. Even in a subdued investment year, manufacturers continued to prioritize the connectivity, diagnostics, and flexibility that modern I/O architectures provide. As demand shifts from simply expanding capacity toward modernizing and connecting existing operations, I/O modules are moving beyond routine hardware components to become strategic enablers of digital transformation. The suppliers best positioned for the recovery will be those that combine reliability with intelligence, seamless connectivity, cybersecurity, and support for decentralized, edge-ready architectures," according to Siddhartha Maiti Senior Analyst and key author of ARC's I/O Modules for Discrete Automation Market Research.
I/O Modules for Discrete Automation Market Trends
In addition to providing detailed competitive market share data, the research also addresses key market trends as follows:
Ethernet-based Fieldbuses
The migration toward industrial Ethernet continues to reshape discrete automation networking, steadily displacing traditional fieldbuses as the preferred connectivity layer. Ethernet-based protocols offer higher bandwidth, deterministic performance, and seamless integration between field devices, controllers, and enterprise systems, aligning well with Industry 4.0 and Industrial IoT requirements. The adoption of Time-Sensitive Networking further strengthens this shift by enabling real-time, converged communication over standard Ethernet. For I/O modules, this transition sustains demand for network adapters and Ethernet-ready architectures and supports a gradual move toward higher-value, connected I/O. As standardization efforts consolidate competing protocols, industrial Ethernet is expected to remain a central, structurally growing networking trend.
Industrial 5G
Industrial 5G is emerging as an enabling technology for discrete manufacturing, offering low latency and reliable, large-scale connectivity for mobile equipment and flexible production layouts. Its near-term influence on I/O modules remains limited, as machine-level control continues to rely on deterministic wired networks, but it is expected to support selected wireless monitoring and I/O applications as private 5G matures.
Edge Technologies Push Intelligence to the Machine
Industrial Edge technology is reshaping the discrete I/O modules market by moving data processing closer to where signals originate. Rather than routing every measurement back to a central controller or the cloud, edge-enabled I/O modules can filter, process, and act on data locally at the machine. This shift toward distributed intelligence reduces network traffic, lowers latency, and supports faster, more reliable decision-making on the plant floor. It also strengthens demand for modular and customizable I/O modules that can be tailored to specific application and industry requirements. As edge architectures mature, I/O modules are evolving from passive signal-passing devices into active participants in local data handling, enabling real-time monitoring and condition-based maintenance directly at the source. This capability is a key building block of decentralized, resilient automation architectures, and it is expected to drive steady adoption of edge-capable I/O modules across discrete manufacturing industries in the coming years.
Breaking the Single-Vendor Lock
Interoperability is becoming a buyer requirement rather than a preference. The wider adoption of industrial Ethernet standards, together with vendor-neutral connection technologies and open protocols such as OPC UA and MQTT, is making it far easier for plants to combine I/O modules from different brands within a single system. Modern IO modules increasingly send data directly to IT and cloud platforms, reducing the traditional barriers between the shop floor and enterprise software. This openness allows smaller and regional suppliers to compete for business once held by established incumbents, and it lets buyers evaluate the interoperability and total cost of ownership of I/O hardware independently, even when they remain committed to a single controller brand. For discrete manufacturers running multi-vendor production lines, standards-based connectivity is shifting from a technical convenience to a deliberate procurement strategy that shapes long-term supplier selection.
Leading Suppliers to the I/O Modules for Discrete Automation Market Identified
In addition to providing specific market data and industry trends, this ARC market research also identifies and positions the leading suppliers to this market and provides and summarizes their relevant offerings. An alphabetical list of key suppliers covered in this analysis includes: Beckhoff, Mitsubishi Electric, OMRON, Rockwell Automation, Siemens.
About the I/O Modules for Discrete Automation Research
The I/O Modules for Discrete Automation research explores the current and future market performance and related technology and business trends and identifies leading technology suppliers. This new research is based on ARC’s industry-leading market research database, extensive primary and secondary research, and proprietary economic modelling techniques. The research includes competitive analysis, five-year market forecasts, and nine years of historical analysis. The research segmentation includes Worldwide Region, Hardware Type, Form Factor, Number of Channels, Industry, Machinery Segment, Sales Channel, Customer Type.
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