Bachmann LGL Series Modules

Technical Dossier

Product Details And Specifications

Bachmann LGL Series: Comprehensive Module Range and Technical Overview

The Bachmann LGL (Load Group Logic) series represents a core component family within the Bachmann MPC and MPCX distributed control system (DCS) platform. Deployed extensively across global heavy industry — including petrochemical refineries, offshore oil & gas platforms, nuclear power auxiliary systems, and continuous-process chemical plants — the LGL series provides deterministic I/O processing and inter-module communication within Bachmann's rack-based controller architecture. Its modular backplane design allows field engineers to configure mixed analog/digital I/O assemblies without hardware redesign, a critical requirement in facilities where process uptime is measured in years, not quarters. The LGL series is certified for use in safety-instrumented environments and has accumulated a substantial installed base across European and Asian industrial facilities since its introduction in the late 1990s.

The Evolution of LGL Series Architecture

The Bachmann LGL series was introduced as part of the MPC (Modular Process Controller) platform, which Bachmann Electronic GmbH developed to address the demand for high-availability, rack-based control in process industries. Early LGL modules operated on a proprietary parallel backplane bus with fixed slot addressing, limiting hot-swap capability. Subsequent hardware revisions introduced active backplane management, enabling live module replacement without process interruption — a feature that became standard in the MPCX generation.

The transition from MPC to MPCX brought a 32-bit internal data bus, expanded channel density per module slot, and support for PROFIBUS-DP and CANopen field bus integration directly at the I/O module level. LGL modules in the MPCX generation also introduced onboard diagnostics registers accessible via the Bachmann SolutionCenter engineering tool, allowing predictive maintenance workflows. As of 2024, the LGL series is in a mature/end-of-active-production phase; Bachmann continues to supply spare modules through authorized channels, but new project designs are directed toward the Bachmann M1 series platform. For facilities with existing LGL installations, long-term maintenance support remains the primary procurement driver.

LGL Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced modules within the Bachmann LGL series. Modules are classified by functional category.

Controller & CPU Modules

• LGL.010.044.020.208: Logic group controller module, 208-point capacity, rack master
• LGL.010.044.020.104: Logic group controller, 104-point I/O capacity, standard rack
• LGL.010.044.010.208: Compact logic controller, single-slot, 208-channel bus master
• LGL.010.020.020.208: Redundant CPU logic module, dual-ported backplane interface

Digital Input (DI) Modules

• LGL.020.010.016.024: 16-channel DI module, 24 VDC, sink/source configurable
• LGL.020.010.032.024: 32-channel DI module, 24 VDC, high-density rack mount
• LGL.020.010.016.120: 16-channel DI module, 120 VAC input, isolated groups
• LGL.020.010.008.048: 8-channel DI module, 48 VDC, intrinsically safe barrier compatible

Digital Output (DO) Modules

• LGL.030.010.016.024: 16-channel DO module, 24 VDC, 0.5 A per channel, short-circuit protected
• LGL.030.010.008.024: 8-channel relay output module, 24 VDC coil, 2 A contact rating
• LGL.030.010.016.120: 16-channel DO module, 120 VAC triac output, zero-cross switching

Analog Input (AI) Modules

• LGL.040.010.008.420: 8-channel AI module, 4–20 mA, 12-bit resolution, HART pass-through
• LGL.040.010.008.010: 8-channel AI module, ±10 V, differential input, 14-bit ADC
• LGL.040.010.004.RTD: 4-channel RTD input module, Pt100/Pt1000, 3-wire compensation
• LGL.040.010.004.TC: 4-channel thermocouple input, types J/K/T/E, cold-junction compensated

Analog Output (AO) Modules

• LGL.050.010.004.420: 4-channel AO module, 4–20 mA, 12-bit DAC, loop-powered diagnostics
• LGL.050.010.004.010: 4-channel AO module, ±10 V, isolated outputs, 14-bit resolution

Communication & Network Adapter Modules

• LGL.060.010.001.PBM: PROFIBUS-DP master adapter, up to 125 slave nodes, 12 Mbit/s
• LGL.060.010.001.CAN: CANopen master module, 127-node capacity, 1 Mbit/s bus rate
• LGL.060.010.001.ETH: Ethernet TCP/IP communication module, 10/100 Mbit/s, Modbus TCP support

Power Supply Modules

• LGL.070.010.001.024: 24 VDC rack power supply module, 10 A output, redundancy-capable
• LGL.070.010.001.048: 48 VDC rack power supply, 5 A, wide-range AC input 85–264 VAC

Sourcing Hard-to-Find & Obsolete LGL Series Parts

As the Bachmann LGL series has entered its mature/end-of-production lifecycle, procurement of replacement modules through standard distribution channels has become increasingly constrained. DriveKNMS maintains a dedicated inventory of tested LGL series modules sourced from decommissioned plant assets, authorized surplus channels, and direct factory overstock. For facilities operating legacy MPC or MPCX racks, DriveKNMS provides the following lifecycle extension services: verified stock of discontinued LGL SKUs, cross-reference matching for superseded part numbers, and lead-time commitment for emergency shutdown (ESD) and turnaround (TAR) procurement windows. Inquiries for specific LGL module variants — including non-standard channel counts or regional firmware revisions — are handled directly by our technical sourcing team. Response time for stock confirmation is typically within one business day.

Quality Control for the LGL Series Range

Bachmann LGL modules incorporate a multi-layer backplane bus architecture with active signal conditioning on each I/O channel. DriveKNMS applies a structured test protocol to all LGL modules prior to shipment. Each module undergoes: (1) visual inspection of backplane connector pins, conformal coating integrity, and capacitor condition; (2) powered functional test using a Bachmann MPC/MPCX test rack with SolutionCenter diagnostic software to verify channel-by-channel I/O response, internal register read/write, and bus communication handshake; (3) thermal soak at 55°C for 2 hours to screen latent component failures; (4) final calibration verification for analog modules against NIST-traceable reference standards. Modules that do not pass all test stages are quarantined and not offered for sale. Test records are retained and available upon request for quality-critical procurement.