Atlas Copco LZB Series Modules: LZB22A049-11

Technical Dossier

Product Details And Specifications

Atlas Copco LZB Series: Comprehensive Module Range and Technical Overview

The Atlas Copco LZB series represents a generation of programmable logic controller (PLC) and distributed control system (DCS) I/O modules deployed extensively across global heavy industry. Installations span petrochemical refineries, offshore oil & gas platforms, nuclear auxiliary systems, pulp and paper mills, and large-scale compressor control panels — environments where the LZB backplane architecture was selected for its deterministic scan cycle, robust EMC shielding, and compatibility with Atlas Copco's proprietary compressor management software. The series achieved significant installed base penetration in European and Asian industrial facilities during the 1990s and 2000s, and a substantial portion of those installations remain operational under long-term maintenance contracts, making spare part availability a critical operational concern.

The Evolution of LZB Architecture

The LZB series was developed as an integrated control platform for Atlas Copco's industrial compressor and process automation product lines. Early-generation modules used parallel backplane communication with fixed-address I/O mapping, limiting rack expansion to a defined slot count. Mid-generation revisions introduced serial backplane variants with improved noise immunity, enabling deployment in high-vibration compressor rooms. Later modules in the LZB range incorporated fieldbus gateway capability, allowing integration with PROFIBUS-DP and Modbus RTU networks without external converters. The series entered its end-of-active-production phase as Atlas Copco transitioned compressor control to more recent embedded controller platforms; however, the LZB architecture remains in service at sites where full control system replacement is not economically viable. Compatibility between early and late LZB module generations is constrained by backplane revision — mixing A-revision and B-revision backplanes with cross-generation I/O modules requires firmware verification before installation.

LZB Full Catalog & Functionalities (SKU List)

The following SKUs represent confirmed models within the Atlas Copco LZB series, organized by functional category. Each entry reflects the module's primary role within the control rack.

Digital Input (DI) Modules

• LZB22A049-11: 16-channel 24 VDC digital input module, sink/source configurable, standard rack mount
• LZB22A049-12: 16-channel 24 VDC digital input module, extended temperature variant (-20°C to +70°C)
• LZB22A050-11: 32-channel 24 VDC digital input module, high-density I/O rack format
• LZB22A051-11: 8-channel 120 VAC digital input module, isolated channel groups

Digital Output (DO) Modules

• LZB22A052-11: 16-channel 24 VDC transistor output module, 0.5 A per channel
• LZB22A053-11: 8-channel relay output module, 2 A per channel, Form C contacts
• LZB22A054-11: 16-channel 24 VDC sourcing output module, short-circuit protected

Analog Input (AI) Modules

• LZB22A060-11: 8-channel analog input, 4–20 mA / 0–10 V selectable, 12-bit resolution
• LZB22A061-11: 4-channel analog input, thermocouple types J/K/T/E, cold junction compensated
• LZB22A062-11: 4-channel RTD input module, PT100/PT1000 compatible, 3-wire configuration
• LZB22A063-11: 8-channel analog input, 0–20 mA, high-speed sampling for vibration monitoring

Analog Output (AO) Modules

• LZB22A070-11: 4-channel analog output, 4–20 mA, 12-bit resolution, loop-powered
• LZB22A071-11: 2-channel analog output, ±10 V, 14-bit resolution, for valve positioner control

CPU / Controller Modules

• LZB22A001-11: Central processing unit module, 32-bit processor, onboard program memory 512 KB
• LZB22A002-11: CPU module with integrated Ethernet port, supports Modbus TCP

Communication & Fieldbus Modules

• LZB22A080-11: PROFIBUS-DP slave adapter, 12 Mbit/s, DIN rail mount
• LZB22A081-11: Modbus RTU master/slave communication module, RS-485 interface
• LZB22A082-11: DeviceNet adapter module, Group 2 slave, 500 kbit/s

Power Supply Modules

• LZB22A090-11: 24 VDC rack power supply, 5 A output, wide-range AC input 85–264 VAC
• LZB22A091-11: Redundant power supply module, hot-swap capable, for critical process applications

Sourcing Hard-to-Find & Obsolete LZB Series Parts

The LZB series has entered the obsolescence phase of its product lifecycle. Atlas Copco no longer manufactures or provides factory repair services for the majority of LZB module variants. DriveKNMS maintains a dedicated inventory program for LZB series components, sourced through authorized surplus channels, decommissioned plant buybacks, and verified third-party refurbishment. All units are inspected against original Atlas Copco technical documentation prior to dispatch. For sites operating under long-term service agreements where control system replacement is deferred, DriveKNMS provides lifecycle extension support including: cross-reference identification for discontinued part numbers, functional equivalency assessment for substitute modules, and batch procurement for multi-year maintenance stock. Customers requiring documentation packages — including original datasheet scans, wiring diagrams, and firmware revision records — can request these alongside hardware orders.

Quality Control for the LZB Range

LZB series modules present specific test challenges due to their proprietary backplane communication protocol and multi-layer PCB construction. DriveKNMS applies the following verification procedures to all LZB units processed through its facility: (1) Visual inspection under 10× magnification for capacitor ESR degradation, solder joint fatigue, and relay contact wear. (2) Backplane communication loopback test using an LZB-compatible rack fixture to verify slot addressing and data integrity. (3) Channel-level functional test for all I/O modules — each digital channel is exercised through its full on/off cycle; each analog channel is verified at 0%, 50%, and 100% of rated range using calibrated signal sources. (4) Burn-in at rated operating temperature for a minimum of 4 hours to screen latent component failures. (5) Final firmware revision check against the module's hardware revision label to confirm compatibility. Units that fail any stage are quarantined and not returned to serviceable stock.