TURCK BL67 Modules

Technical Dossier

Product Details And Specifications

TURCK BL67 Series: Comprehensive Module Range and Technical Overview

The TURCK BL67 is a modular fieldbus I/O system engineered for distributed automation in heavy industrial environments. Deployed extensively across petrochemical refineries, chemical processing plants, offshore platforms, and nuclear auxiliary systems, the BL67 platform provides a standardized, DIN-rail-mounted I/O architecture that decouples field wiring from the control network. Its IP67-rated station design — enabling direct cabinet-free installation in the field — has made it a reference architecture for machine builders and system integrators operating under IEC 61131 and NAMUR NE 21 requirements. The BL67 gateway layer supports PROFIBUS DP, DeviceNet, CANopen, Modbus TCP, PROFINET, and EtherNet/IP, making it one of the most protocol-agnostic distributed I/O platforms in the sub-$5,000 station segment. Installed base estimates place BL67 deployments in active service across more than 60 countries, with a significant proportion of units operating beyond their original 10-year design lifecycle — a fact that drives sustained demand for spare modules and gateway replacements.

The Evolution of BL67 Architecture

The BL67 platform was introduced by TURCK in the early 2000s as a successor to the BL20 cabinet-mounted I/O system, specifically targeting applications where IP67 ingress protection was required at the field level. The first generation of BL67 gateways supported serial fieldbus protocols — PROFIBUS DP (BL67-GW-DP), DeviceNet (BL67-GW-DN), and CANopen (BL67-GW-CO) — reflecting the dominant control network standards of that era. These gateways communicated with the host PLC or DCS via a 9-pin D-sub or M12 fieldbus connector and managed up to 64 I/O modules per station.

The second architectural evolution introduced Ethernet-based gateways: BL67-PG-EN-V3 (PROFINET), BL67-GW-EN (EtherNet/IP), and BL67-GW-MB-TCP (Modbus TCP). These variants added web-server diagnostics, DHCP/static IP configuration, and extended module addressing. The internal backplane bus — operating at a fixed 768 kbps — remained unchanged across generations, ensuring backward compatibility between legacy I/O modules and newer Ethernet gateways. This architectural continuity is a critical factor for plant engineers performing gateway upgrades without rewiring field I/O.

As of 2026, the BL67 series is in a mature/end-of-active-development phase. TURCK continues to supply modules under long-term availability commitments, but new feature development has migrated to the TBEN (Ethernet Block I/O) and BL20 E-remote platforms. For facilities with existing BL67 infrastructure, the recommended strategy is lifecycle extension through spare module stockpiling and gateway protocol migration rather than full platform replacement.

BL67 Full Catalog & Functionalities (SKU List)

Gateway / Communication Modules

• BL67-GW-DP: PROFIBUS DP gateway, max 244 bytes I/O, 9.6 kbps–12 Mbps baud rate
• BL67-GW-DN: DeviceNet gateway, Group 2 server, 0–500 kbps, up to 64 I/O modules
• BL67-GW-CO: CANopen gateway, DS301 V4.02, NMT master/slave, 10–1000 kbps
• BL67-PG-EN-V3: PROFINET IO device gateway, RT Class 1, integrated web server
• BL67-GW-EN: EtherNet/IP adapter gateway, CIP conformance tested, 10/100 Mbps
• BL67-GW-MB-TCP: Modbus TCP gateway, function codes FC01–FC06/FC15/FC16 supported

Digital Input Modules

• BL67-4DI-24VDC-0.2A: 4-channel DI, 24 VDC, IEC 61131-2 Type 1/3, 0.2 A short-circuit protection
• BL67-8DI-24VDC: 8-channel DI, 24 VDC, M8 connector, 3 ms input filter
• BL67-16DI-24VDC: 16-channel DI, 24 VDC, flat-ribbon connector, high-density layout
• BL67-4DI-24VDC-P: 4-channel DI with diagnostics, PNP, LED status per channel

Digital Output Modules

• BL67-4DO-24VDC-0.5A: 4-channel DO, 24 VDC, 0.5 A per channel, short-circuit protected
• BL67-4DO-24VDC-2A: 4-channel DO, 24 VDC, 2 A per channel, for solenoid valve loads
• BL67-8DO-24VDC-0.5A: 8-channel DO, 24 VDC, 0.5 A, M8 connector, reverse polarity protected
• BL67-4DO-24VDC-2A-P: 4-channel DO with diagnostics, PNP, overload detection per channel

Analog Input / Output Modules

• BL67-2AI-I: 2-channel AI, 0/4–20 mA, 12-bit resolution, M12 connector
• BL67-2AI-U: 2-channel AI, 0–10 V / ±10 V, 12-bit resolution, configurable via DIP switch
• BL67-2AO-I: 2-channel AO, 0/4–20 mA, 12-bit resolution, short-circuit protected output
• BL67-2AO-U: 2-channel AO, 0–10 V, 12-bit resolution, M12 connector

Power Feed / Segment Modules

• BL67-PF-24VDC: Power feed module, 24 VDC, separates power segments within a BL67 station

Sourcing Hard-to-Find & Obsolete BL67 Parts

DriveKNMS maintains a dedicated inventory program for BL67 series modules, with particular focus on serial-fieldbus gateway variants (BL67-GW-DP, BL67-GW-DN, BL67-GW-CO) that are no longer in active production at standard distribution channels. Our sourcing network covers manufacturer-refurbished units, tested surplus from decommissioned plant assets, and new-old-stock (NOS) from authorized regional distributors in Europe and Asia-Pacific.

For facilities operating BL67 stations beyond their original design lifecycle, DriveKNMS offers: (1) single-unit emergency replacement with 48-hour dispatch capability; (2) multi-unit blanket orders for planned maintenance shutdowns; (3) cross-reference advisory for protocol migration — e.g., replacing a BL67-GW-DP with a BL67-PG-EN-V3 while retaining existing I/O modules. All sourced units are accompanied by test reports and, where applicable, original manufacturer documentation.

Quality Control for the BL67 Range

BL67 modules present specific test challenges due to their integrated backplane bus architecture and protocol-specific gateway firmware. DriveKNMS applies the following verification procedures to all BL67 units prior to dispatch:

• Backplane bus continuity test: Each module is seated in a reference BL67 station and polled via the internal 768 kbps bus to confirm data exchange integrity across all I/O channels.
• Gateway protocol handshake verification: For BL67-GW-DP units, a PROFIBUS master simulator (GSD file loaded) is used to confirm correct slave address response, I/O byte mapping, and diagnostic telegram generation.
• Analog channel calibration check: AI/AO modules are tested at 0%, 50%, and 100% of rated range using a calibrated signal source, with deviation logged against factory specification (±0.1% FSR).
• IP67 seal inspection: Connector seals and housing gaskets are visually inspected and, for field-returned units, subjected to a 30-minute humidity exposure test.
• Firmware version logging: Gateway firmware version is recorded and cross-referenced against TURCK's compatibility matrix to flag any known interoperability issues with specific PLC/DCS host systems.