Mitsubishi MELSEC-L Series Modules: L60ADIL8-CM

Technical Dossier

Product Details And Specifications

Mitsubishi Electric MELSEC-L Series: Comprehensive Module Range and Technical Overview

The Mitsubishi Electric MELSEC-L Series is a compact, high-density programmable logic controller platform engineered for process-critical environments including petrochemical refineries, nuclear power auxiliary systems, chemical batch plants, and continuous manufacturing lines. Introduced as a space-optimized successor to the MELSEC-Q platform's modular philosophy, the L Series integrates CPU, I/O, and communication functions into a slim 27.8 mm-pitch backplane architecture. Its global installed base spans Asia-Pacific, the Middle East, and European heavy industry, where panel space constraints and high-channel-density requirements make it the preferred compact PLC solution. The series supports redundant CPU configurations, high-speed analog sampling, and multi-protocol industrial Ethernet, making it suitable for both standalone machine control and distributed DCS-integrated architectures.

The Evolution of MELSEC-L Series Architecture

The MELSEC-L Series was formally introduced in the mid-2000s as Mitsubishi Electric's response to the demand for a slim-form-factor PLC that retained the processing power of the Q Series. Early revisions of the L Series CPU (L02CPU, L06CPU) operated on a single-bus backplane with limited expansion capability. Subsequent hardware revisions introduced the extension base unit concept (L6EXT2) and expanded the analog I/O channel density, culminating in modules such as the L60ADIL8-CM with isolated 8-channel analog input capability.

Compatibility across L Series generations is governed by the CPU firmware version and the base unit revision. Modules produced before 2012 may require firmware updates to operate with later L26CPU-BT redundant CPU pairs. The series reached mainstream maturity by 2015 and entered a sustained-support phase by 2020, with Mitsubishi Electric committing to repair and spare parts availability through authorized channels. New installations increasingly migrate to the iQ-L or iQ-R platform, but the MELSEC-L Series remains in active production support for existing installed bases.

MELSEC-L Series Full Catalog & Functionalities (SKU List)

CPU Modules

• L02CPU: Base CPU, 10K steps, single-bus, no built-in I/O
• L06CPU: Mid-range CPU, 60K steps, built-in Ethernet port
• L26CPU: High-end CPU, 260K steps, dual built-in Ethernet
• L26CPU-BT: Redundant CPU module, 260K steps, hot-standby configuration
• L26CPU-PBT: Redundant CPU with PROFIBUS-DP master interface

Analog Input Modules

• L60AD4: 4-channel analog input, voltage/current, 16-bit resolution
• L60ADI8-CM: 8-channel current input, isolated channel-to-channel, 16-bit
• L60ADIL8-CM: 8-channel isolated analog input, loop-powered, 4–20 mA, 16-bit resolution — the subject SKU of this page
• L60AD4-2GH: 4-channel high-speed analog input, 80 µs conversion time

Analog Output Modules

• L60DA4: 4-channel analog output, voltage/current selectable, 16-bit
• L60DA8-CM: 8-channel analog output, isolated, current output
• L60DAVL8-CM: 8-channel isolated analog output, voltage/current, loop-powered

Digital Input / Output Modules

• L42: 32-point DC input module, sink/source selectable, 24 VDC
• L42-5V: 32-point DC input, 5 VDC logic level
• L62: 32-point transistor output, sink type, 0.1 A per point
• L62P: 32-point transistor output, source type, 0.1 A per point
• L60RD4: 4-channel RTD input module, Pt100/Pt1000/Ni100 compatible

Communication & Network Modules

• LJ71C24: Serial communication module, RS-232/RS-422/RS-485
• LJ71E71-100: Ethernet interface module, 100BASE-TX, SLMP/MC protocol
• LJ71GF11-T2: CC-Link IE Field master/local module

Power Supply Modules

• L61P: 5 VDC power supply, 6 A output, for main base unit
• L63P: 5 VDC power supply, 9 A output, for extended configurations

Sourcing Hard-to-Find & Obsolete MELSEC-L Series Parts

DriveKNMS maintains a dedicated inventory program for MELSEC-L Series modules that have been discontinued or placed on long lead-time allocation by Mitsubishi Electric's distribution network. For facilities operating L Series PLCs in safety-instrumented or continuous-process environments, unplanned downtime caused by unavailable spare modules represents a direct production loss. DriveKNMS sources verified surplus and refurbished L Series modules — including early-revision CPU units, isolated analog I/O modules, and legacy communication adapters — through a controlled procurement chain that includes factory-sealed new-old-stock, tested-good pulls from decommissioned panels, and certified refurbished units.

All sourced modules are cross-referenced against Mitsubishi Electric's hardware revision tables to confirm firmware compatibility with the target CPU version before shipment. For modules such as the L60ADIL8-CM that are no longer in standard production runs, DriveKNMS provides a minimum 12-month warranty and full functional test documentation. Customers operating under IEC 61511 or ISA-84 lifecycle management requirements can request traceability documentation packages.

Quality Control for the MELSEC-L Series Range

The MELSEC-L Series backplane uses a proprietary high-speed bus operating at 100 Mbps between the CPU and I/O modules. Functional verification of L Series modules at DriveKNMS follows a structured test protocol that addresses the specific failure modes of this bus architecture. Each analog module — including the L60ADIL8-CM — undergoes the following test sequence:

• Backplane bus communication test: Module is seated in a live L Series base unit and polled via GX Works2 to confirm error-free I/O refresh at rated scan time.
• Channel isolation verification: For isolated modules (CM suffix), channel-to-channel isolation resistance is measured at 500 VDC to confirm no cross-channel leakage.
• Analog accuracy calibration: Each input channel is driven with a precision 4–20 mA source traceable to NIST standards; output values are logged across the full range and compared against factory tolerance (±0.1% of full scale).
• Thermal cycling: Modules are cycled between 0°C and 55°C operating range to identify cold-solder or capacitor degradation faults not visible at room temperature.
• Firmware revision audit: Module firmware version is read via GX Works2 and recorded in the test report to confirm compatibility with target CPU firmware.

Test reports are available upon request for all modules shipped by DriveKNMS.