Industrial Network Communication Protocols

Enicstra stocks protocol-specific hardware for major industrial network protocols — the physical-layer connectors, terminators, repeaters, coupler modules, and PLC interface cards used to implement Profinet, EtherCAT, Profibus DP/PA, EtherNet/IP CIP, Modbus TCP/RTU, CANopen, DeviceNet, AS-Interface, and CC-Link networks on machinery.

Inventory covers Profibus connectors and terminators (Siemens 6GK1500, Erni), EtherCAT slave couplers (Beckhoff EK series), Profinet IO devices and switches (Phoenix Contact, Siemens), EtherNet/IP-rated cables and ODVA-certified connectors, AS-i power supplies and couplers (Bihl+Wiedemann, Pepperl+Fuchs), CANopen interfaces, and DeviceNet trunk/drop hardware. Obsolete protocol-specific hardware is sourced through our supplier network. Items ship with a 12-month functional warranty.

For obsolete protocol hardware, send the OEM part number for a quote within 1–2 business days.

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Industrial Network Communication Protocols

Yaskawa SI-P1 PROFIBUS-DP PROFIBUS-DP Communication Option Card

MFR #: SI-P1 PROFIBUS-DP

$653.55/ea ✓ Available

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Buying guide

Choosing Industrial Network Communication Protocols components

Each industrial protocol has its own physical-layer rules: cable type, connector pinout, termination, segment length, branch limits, and topology. Substituting hardware across protocols rarely works, and even within a protocol, generic-looking parts may not meet the OEM specifications the network was certified to.

Specs to confirm before ordering:

Profibus DP: 9-pin D-sub connectors with integrated terminator (often Siemens 6GK1500-0FC10 or similar), purple cable, terminators at line ends, maximum segment length depending on baud rate
Profinet: Green cable, M12 D-code or RJ45 connectors, Cat 6a, switch-based topology, no terminators
EtherCAT: Green cable, RJ45 or M12 D-code/X-code, line topology with EK-series couplers, EtherCAT-rated cable
EtherNet/IP: Gray cable, RJ45 or M12 D-code/X-code, switch-based, ODVA-rated components
Modbus RTU: RS-485 2-wire or 4-wire, 120 Ω terminators at line ends, baud-rate-dependent segment length
CANopen / DeviceNet: 5-wire trunk/drop topology with 120 Ω terminators, specific cable colors (CANopen vs. DeviceNet)
AS-i: Yellow flat cable with insulation displacement connectors, dedicated AS-i power supply (not generic 24 V)

Common gotchas: a Profibus segment without proper terminators at both ends has reflections that corrupt data — installations work intermittently and look like cable problems. EtherCAT requires line topology through the EK couplers; using a standard switch breaks the protocol's cyclic timing. AS-i uses an unusual 30 VDC power supply with modulated data on the power conductors; a generic 24 V supply will not work. CANopen and DeviceNet share physical layer (CAN bus) but use different cable colors and different higher-level protocols — connectors look identical but cables are specific to each.

Typical applications: building or repairing a Profibus segment, extending an EtherCAT line with new slaves, adding Profinet drops on a Siemens-controlled machine, replacing aging RS-485 Modbus cabling, and installing AS-i lighting and sensor networks. On legacy installations, exact-OEM protocol hardware preserves the certified network performance.

For obsolete protocol-specific hardware, send the OEM part number for a sourcing quote.

Related categories Frequently asked questions

Do you stock obsolete Profibus and CANopen hardware?

Yes. Discontinued Siemens 6GK1500 connector codes, retired Erni Profibus connectors, end-of-life CANopen couplers, and earlier DeviceNet T-port connectors are sourced through our supplier network.

Can I use Cat 5e cable on a Profinet network?

Cat 5e is the absolute minimum and is sometimes acceptable for short low-speed runs, but Profinet International recommends Cat 6 / Cat 6a (Type A/B/C) cables with green jacket for new installations to meet EMC and bandwidth requirements over plant life.

What is a Profibus terminator and where does it go?

A 220/390/220 Ω resistor network that prevents signal reflection at the cable end. Required at both physical ends of every Profibus segment. Most Profibus D-sub connectors have built-in terminators with a switch; "ON" at line ends, "OFF" in the middle.

Will an EtherNet/IP cable work for Profinet?

The cable itself often works (both are 100Base-T Ethernet). The connectors and certifications differ — Profinet specifies green jacket and Type A/B/C ratings; EtherNet/IP specifies gray jacket and ODVA-certified components. Mixing causes documentation and warranty questions but usually functions electrically.

Does AS-i need a special power supply?

Yes — a 30 VDC AS-i power supply that decouples data from power. Generic 24 V supplies do not work. Bihl+Wiedemann, Pepperl+Fuchs, and Siemens all make AS-i-specific supplies.

What is the warranty?

12-month functional warranty on the hardware. Network performance with customer-specific topology and cabling is the installer's responsibility.