Core Selection Logic: First, match the communication protocol and I/O type/quantity, then combine the industrial environment and real-time requirements to select the product, balancing scalability and cost-effectiveness.
I. Core Selection Dimensions (Priority List)
1. Communication Protocol Matching (Determines Compatibility, Primary Dimension)
Wired Protocols:
Mainstream Industrial Solutions (Complex Scenarios): PROFINET (Siemens ET200, EBYTE P31 Series), EtherNet/IP (Rockwell 1794 FLEX I/O), suitable for high real-time production lines.
Low-Cost and Universal: Modbus TCP (Advantech ADAM6000), RS485 (EBYTE GXAXA0404 Series), suitable for small and medium-sized monitoring systems.
Wireless Protocols (Wireless-Free Scenarios):
Long-Range and Low-Power Consumption: LoRa (EBYTE M31-AAAX4440G-L Series, 10km Transmission in Open Areas), suitable for wide-area scenarios such as factories and agriculture.
1. Short-range, high-bandwidth: WiFi/Zigbee (Schneider EcoStruxure IO), suitable for interconnecting equipment within the workshop.
2. IO Type and Quantity (Matching on-site requirements, avoiding redundancy)
Digital (DI/DO): Adaptable to sensor status monitoring (DI) and solenoid valve control (DO), prioritizing modules supporting NPN/PNP compatibility (EBYTE M31 series) and relay output (load ≥ 5A).
Analog (AI/AO): For high-precision acquisition, select modules with 16-bit or higher resolution (e.g., Ebix 4AI+4AO modules), compatible with pressure and flow sensors; output must match actuator signals (020mA/420mA).
Expansion Capability: Select modules supporting modular splicing (Ebix up to 16 expansion modules) or modular design (WAGO 750 series) for easy future expansion.
3. Industrial Environment Adaptability (Key Dimension for Stability)
Protection Rating: IP67 or higher for outdoor/humid environments (Siemens ET 200eco PN, Rockwell ArmorBlock I/O); for coastal/salt spray environments, prioritize modules with conformal coating (EBYTE M31 series).
Wide Temperature and Voltage Range: Must meet operating temperature ranges of 40℃~+85℃ and 936V wide voltage supply in extreme environments (Ebix LoRa IO modules), suitable for cold storage and outdoor equipment.
Interference Immunity: Must support channel-level opto-isolation (impedance above 7.2kΩ) to resist industrial electromagnetic interference (Phoenix Axioline series).
4. Real-Time Performance and Reliability (Choose Based on Scenario)
High Real-Time Requirements (Robotics, Precision Manufacturing): Select modules with response time ≤1ms (Phoenix Axioline) and support for the EtherCAT protocol (B&R X20 series).
General scenario: Response time <300ms is acceptable, with priority given to MTBF (Mean Time Between Failures ≥50,000 hours, EBYTE M31 series).
II. Selection of High-Performance Products from Mainstream Brands (Category by Scenario)
1. Wired Industrial Grade (Stability First, Suitable for Workshops/Production Lines)
High-end Complex Scenarios: Siemens ET 200SP (Miniaturized, Multi-protocol), Rockwell 1794 FLEX I/O (EtherNet/IP advantages, suitable for automotive manufacturing).
Mid-range Cost-Effectiveness: EBYTE P31 Series (Profinet protocol, precise IO mapping, suitable for packaging machinery), Advantech ADAM6000 (Modbus TCP, supports web remote management).
Low-Cost General Purpose: EBYTE GXAXA0404 (RS485+4AI+4AO, suitable for small-scale monitoring), Phoenix Contact Inline Module (Flexible combination, small to medium-sized systems).
2. Wireless Industrial Grade (Waving-free, suitable for wide-area/distributed scenarios)
Long-range low power consumption: EBYTE M31-AAAX4440G-L series (LoRa band, 4DI+4AI+4DO, 10km coverage, suitable for smart agriculture/ports).
Short-range interconnection: Schneider EcoStruxure IO (LoRa/Zigbee, suitable for building energy management), Advantech WISE4000 (wireless IIoT adapter).
3. Dedicated for Harsh Environments (High protection, suitable for outdoor/chemical environments)
Siemens ET 200eco PN (IP67, PROFINET), Rockwell ArmorBlock I/O (IP69K, high-pressure wash resistant), B&R X90 series (5G+LPWAN, outdoor control).