BACHMANN WT305E Series Power Panel Modules: WT305E LX700/DD256/CF512MB

Technical Dossier

Product Details And Specifications

BACHMANN WT305E Series: Comprehensive Module Range and Technical Overview

The BACHMANN WT305E is a panel-mount industrial HMI and controller platform developed by Bachmann electronic GmbH (Austria), a specialist in high-reliability automation systems for process-critical industries. The WT305E series occupies a defined position in heavy industrial deployments including chemical processing plants, offshore oil & gas platforms, hydroelectric power stations, and nuclear auxiliary systems where deterministic control response and long-term hardware availability are non-negotiable requirements.

The WT305E platform integrates a real-time processor subsystem with a touch-enabled operator panel, eliminating the need for a separate HMI terminal in space-constrained control cabinets. Its architecture is based on the Bachmann M1 automation system framework, enabling direct integration with Bachmann I/O modules, fieldbus adapters, and redundancy controllers. Installations of this series are documented across European utility infrastructure and petrochemical facilities with operational lifespans exceeding 15 years.

The Evolution of WT305E Architecture

The WT305E belongs to Bachmann's second-generation Power Panel product line, succeeding earlier WT-series terminals that used passive-matrix displays and RS-232-only communication interfaces. The architectural transition to the WT305E introduced the following changes:

Early WT-Series (pre-2005): Passive LCD, no integrated Ethernet, proprietary Bachmann serial bus only. Limited to local HMI functions with no embedded controller capability.

WT305E Generation (2005–2015 active production): Active TFT color display (typically 5.7" or 10.4" depending on variant), integrated LX700 or compatible RISC processor, onboard CompactFlash storage (CF512MB standard), DDR memory (DD256 = 256 MB DDR), dual Ethernet ports, CANopen and PROFIBUS-DP fieldbus support via optional adapter modules. The LX700/DD256/CF512MB configuration designates: processor variant LX700, 256 MB DDR RAM, 512 MB CompactFlash storage.

Compatibility Considerations: The WT305E runs Bachmann's proprietary SolutionCenter runtime environment. Firmware versions are tied to hardware revisions; cross-version firmware flashing without Bachmann authorization can result in boot failure. Replacement units must match the original hardware revision code stamped on the rear label. Integration with third-party SCADA systems is achieved via OPC-DA/UA server modules running on the M1 runtime.

Modern Alternatives (post-2018): Bachmann has transitioned newer projects to the WT3200 and MX213 series, which offer ARM Cortex-A9 processors, capacitive multi-touch displays, and native IEC 61850 support. However, the WT305E remains the only compatible replacement for existing WT305E-based installations without a full control system retrofit.

WT305E Full Catalog & Functionalities (SKU List)

The following SKUs represent the verified WT305E series module range. Each entry reflects a distinct hardware configuration or accessory within the Bachmann WT305E ecosystem.

Power Panel CPU / HMI Variants:

WT305E LX700/DD256/CF512MB: 5.7" TFT panel, LX700 CPU, 256MB DDR, 512MB CF, dual ETH, M1 runtime host.

WT305E LX800/DD512/CF1GB: Upgraded LX800 processor, 512MB DDR, 1GB CompactFlash, enhanced graphics rendering for complex SCADA mimics.

WT305E LX700/DD256/CF256MB: Base storage variant with 256MB CF; used in applications with minimal data logging requirements.

WT305E LX700/DD512/CF512MB: Extended RAM variant for applications running multiple concurrent IEC 61131-3 tasks with large data sets.

WT305E-10/LX700/DD256/CF512MB: 10.4" TFT display variant of the standard WT305E; same processor and memory specification, larger operator interface.

WT305E-10/LX800/DD512/CF1GB: 10.4" panel with LX800 CPU and maximum standard memory configuration for the WT305E generation.

I/O and Fieldbus Adapter Modules (WT305E-compatible, M1 backplane):

MX203: Bachmann M1 CPU module; used as co-processor or standalone controller in WT305E-based M1 racks.

MX207: M1 CPU module with extended memory; direct functional peer to MX203 with higher RAM ceiling.

DI212: 12-channel 24VDC digital input module; IEC 61131-2 Type 1/3 compliant, 0.2ms input filter.

DO212: 12-channel 24VDC digital output module; 0.5A per channel, short-circuit protected.

AI202: 2-channel analog input, ±10V / 0–20mA selectable, 16-bit resolution.

AO202: 2-channel analog output, ±10V / 0–20mA, 16-bit DAC, galvanically isolated.

CM202: CANopen master/slave communication module for M1 rack; supports up to 127 nodes.

FM211: PROFIBUS-DP master module; supports up to 125 slaves, baud rate to 12 Mbit/s.

NT255: Redundant power supply module for M1 rack; 24VDC input, hot-swap capable.

SH207: M1 rack shield and termination module; used at bus termination positions in extended rack configurations.

WT305E-PS24: Dedicated 24VDC panel power supply accessory for WT305E; mounts adjacent to panel unit in DIN rail configurations.

CF512MB-IND: Industrial-grade 512MB CompactFlash card; Bachmann-qualified replacement storage for WT305E units with failed CF media.

CF1GB-IND: Industrial-grade 1GB CompactFlash replacement; compatible with LX800 variants requiring expanded storage.

WT305E-BATT: SRAM backup battery module for WT305E; maintains retain data and real-time clock during power loss. Recommended replacement interval: 5 years.

Sourcing Hard-to-Find & Obsolete WT305E Parts

The WT305E series entered end-of-active-production status approximately 2015–2018 depending on variant. Bachmann electronic GmbH no longer manufactures new WT305E units, and OEM spare part availability through authorized distributors is limited to remaining warehouse stock. Lead times from European distributors for specific configurations such as the LX700/DD256/CF512MB can exceed 16–24 weeks when available at all.

DriveKNMS maintains a dedicated inventory program for Bachmann WT305E lifecycle support. Our sourcing operations cover:

Tested Used Units: Decommissioned WT305E panels sourced from plant shutdowns and system upgrades, inspected and function-tested prior to listing. Each unit is verified for display integrity, Ethernet port function, CF card read/write, and M1 bus communication.

New Old Stock (NOS): Sealed original-packaging units from legacy distributor stock, verified against Bachmann part number databases for authenticity.

Component-Level Repair: For units with repairable faults (failed backlight, corrupted CF, battery depletion, blown output channels), DriveKNMS offers board-level repair with 90-day post-repair warranty.

Quality Control for the WT305E Range

The WT305E integrates a proprietary M1 backplane bus that requires protocol-level validation beyond standard power-on testing. DriveKNMS applies the following test procedures to all WT305E units processed through our facility:

Display and Touch Calibration: Full-screen pixel test for dead pixels, backlight uniformity check, and resistive touch calibration across a 9-point grid. Units with more than 3 adjacent dead pixels or touch deviation exceeding ±2mm are rejected.

Processor and Memory Validation: Extended burn-in at 50°C ambient for 4 hours with continuous memory read/write cycles. DDR memory tested with memtest protocol; CF card tested for read/write speed against Bachmann minimum specification (minimum 4MB/s sustained write).

M1 Bus Communication Test: WT305E unit is installed in a reference M1 rack with known-good DI212, DO212, and CM202 modules. SolutionCenter runtime is loaded and I/O scan cycle is verified at 1ms task cycle time without communication errors over a 30-minute test window.

Ethernet Port Test: Both Ethernet ports tested for 100BASE-TX link negotiation, packet loss at sustained 90% bandwidth load, and VLAN tagging function where applicable.

Firmware Version Documentation: Firmware version is read from the unit and recorded. Customers are notified of the installed firmware version prior to shipment to confirm compatibility with their SolutionCenter project version.