ABB MOD600 Modules: MOD600FLECMIR QMS 2.23.00.14 0020-29344-A 810-495659-006 LECM Power Supply Module

Technical Dossier

Product Details And Specifications

ABB MOD600 Series Technical Notes

The MOD600 platform achieved widespread adoption throughout the 1980s and 1990s and remains operational in thousands of installed base sites worldwide. Its longevity is attributable to the robustness of its hardware design, the stability of its proprietary MODCELL communication bus, and the high cost of full DCS migration projects. As of 2026, the MOD600 series is classified as a mature/end-of-life product line by ABB, with no new hardware production. Lifecycle extension and spare parts sourcing are the primary support requirements for existing installations.

The Evolution of MOD600 Architecture

The MOD600 system was introduced in the early 1980s as part of ABB's MASTER series DCS family. The original architecture used a parallel backplane bus with proprietary MODCELL protocol for inter-module communication. Early revisions (QMS 1.x firmware) supported basic analog and digital I/O with limited redundancy options. The QMS 2.x generation — to which the MOD600FLECMIR QMS 2.23.00.14 belongs — introduced enhanced diagnostics, improved noise immunity, and expanded support for redundant power supply configurations.

Compatibility between QMS firmware generations is not guaranteed. Modules running QMS 1.x firmware are not directly interchangeable with QMS 2.x modules without system-level configuration review. The backplane connector pinout remained consistent across the MOD600 product lifecycle, but firmware version mismatches can cause bus arbitration failures. Engineers performing module replacement must verify QMS revision compatibility before installation.

The MOD600 was succeeded by the ABB Advant OCS and later the System 800xA platform. However, direct migration from MOD600 to 800xA requires hardware replacement at the I/O marshalling level and is typically executed in phased plant turnaround projects rather than as a single cutover.

MOD600 Full Catalog & Functionalities (SKU List)

Power Supply Modules

• MOD600FLECMIR (0020-29344-A / 810-495659-006): LECM redundant power supply module, QMS 2.23.00.14, 24 VDC output, backplane bus power distribution with fault relay output.
• MOD600FLECM: LECM standard (non-redundant) power supply module, single-rail 24 VDC backplane feed.
• MOD600FPSU: Primary power supply unit, AC input 110/220 VAC, DC output 24 VDC, 10 A rated.
• MOD600FRPS: Redundant power supply module, hot-swap capable, for high-availability rack configurations.

CPU / Controller Modules

• MOD600FCPU: Central processing unit module, MODCELL bus master, supports up to 32 I/O modules per rack.
• MOD600FCPU2: Enhanced CPU module with expanded memory and faster scan cycle, QMS 2.x compatible.
• MOD600FCON: Controller module, standalone loop control, 4 PID loops, MODCELL slave mode.

Analog Input Modules

• MOD600FAI8: 8-channel analog input, 4–20 mA / 0–10 V selectable, 12-bit resolution.
• MOD600FAI16: 16-channel analog input, differential input configuration, 13-bit resolution with HART pass-through.
• MOD600FRTD8: 8-channel RTD input module, Pt100/Pt1000 compatible, 3-wire and 4-wire measurement.
• MOD600FTC8: 8-channel thermocouple input, types J/K/T/E/R/S/B, cold junction compensation onboard.

Analog Output Modules

• MOD600FAO8: 8-channel analog output, 4–20 mA, 12-bit resolution, short-circuit protected.
• MOD600FAO4: 4-channel analog output, high-drive 4–20 mA, loop-powered field device compatible.

Digital Input / Output Modules

• MOD600FDI16: 16-channel digital input, 24 VDC, optically isolated, status LED per channel.
• MOD600FDO16: 16-channel digital output, 24 VDC, 0.5 A per channel, short-circuit protection.
• MOD600FDI32: 32-channel digital input, high-density, 24 VDC, grouped commons.

Communication / Adapter Modules

• MOD600FCOM: MODCELL communication adapter, RS-485 bus interface, supports up to 31 nodes.
• MOD600FETH: Ethernet communication module, 10BASE-T, TCP/IP, Modbus TCP gateway function.
• MOD600FPRO: PROFIBUS DP adapter module, DP-V0/V1, up to 12 Mbit/s, slave mode.

Sourcing Hard-to-Find & Obsolete MOD600 Parts

ABB formally discontinued new production of MOD600 hardware. Replacement modules are no longer available through ABB's standard distribution channels. For plant operators maintaining MOD600-based control systems, the sourcing of tested surplus and refurbished modules is the primary strategy for lifecycle extension without full DCS migration.

Quality Control for the MOD600 Range

MOD600 power supply and communication modules require specialized test procedures due to the proprietary MODCELL backplane bus protocol. Standard bench power-on testing is insufficient to confirm operational status of bus-dependent modules.

DriveKNMS applies the following test protocol to MOD600 modules: (1) Visual inspection — PCB condition, capacitor integrity, connector pin condition, conformal coating assessment. (2) Power-on test — input voltage application at rated specification, output voltage measurement at backplane connector pins, fault relay continuity check. (3) Functional bus test — module insertion into a live MOD600 test rack running QMS 2.x firmware, MODCELL bus enumeration confirmation, diagnostic LED status verification. (4) Burn-in — 48-hour continuous operation under load at ambient temperature 40°C. (5) Final inspection — re-measurement of all output parameters, documentation of test results with unit serial number.