Hitachi CPM-E Series Modules

Technical Dossier

Product Details And Specifications

Hitachi CPM-E Series: Comprehensive Module Range and Technical Overview

The Hitachi CPM-E series is a programmable controller (PLC) module family developed under Hitachi's HIDIC platform, deployed extensively across global heavy industries including petrochemical plants, oil refineries, nuclear facility auxiliary systems, and continuous-process manufacturing. The CPM-E architecture is characterized by a modular backplane design that supports mixed I/O expansion, deterministic scan-cycle execution, and compatibility with Hitachi's proprietary H-series ladder programming environment. Installed base across Asia-Pacific, the Middle East, and Eastern Europe remains substantial, making long-term spare parts availability a critical operational concern for plant engineers and maintenance contractors.

The Evolution of CPM-E Architecture

The CPM-E series emerged from Hitachi's earlier HIDIC H series controller platform, which was introduced in the 1980s as a rack-based industrial controller targeting process automation. The CPM-E designation consolidated CPU and memory management functions into a single compact module format, replacing the earlier multi-board CPU assemblies of the H-200 and H-700 series. Early CPM-E variants operated on proprietary Hitachi bus protocols with fixed memory maps; later revisions introduced expanded program memory (up to 32K steps), extended data registers, and optional communication ports supporting RS-232C and RS-422 interfaces. The transition from CPM-E to successor platforms (including the Hitachi EH-150 and EH-A series) introduced Ethernet-capable CPU modules and IEC 61131-3 structured text support, but the CPM-E series remained in active production through the early 2000s and continues to be supported under Hitachi's long-term maintenance program. Compatibility between CPM-E CPU modules and legacy H-series I/O racks is a known integration constraint: backplane bus voltage levels and slot addressing must be verified before cross-generation substitution.

CPM-E Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the Hitachi CPM-E and closely related HIDIC H-series module ecosystem. Each entry reflects a distinct functional role within the control architecture.

CPU Modules

• CPM-E3: Standard CPU module, 8K-step program memory, RS-232C port, H-series backplane compatible
• CPM-E5: Enhanced CPU module, 16K-step program memory, dual serial ports, extended data register range
• CPM-E7: High-capacity CPU, 32K-step memory, supports floating-point arithmetic, expanded I/O addressing
• CPM-2E: Compact CPU variant, reduced rack footprint, 4K-step memory, single RS-232C interface
• CPM-4E: Mid-range CPU, 8K-step memory, integrated real-time clock, battery-backed SRAM

Digital Input (DI) Modules

• H-4DI: 4-point 24VDC digital input module, sink/source selectable, LED status indicators per channel
• H-8DI: 8-point 24VDC digital input, high-speed input capability, compatible with CPM-E backplane
• H-16DI: 16-point digital input module, 24VDC, grouped commons, DIN rail mountable sub-base
• H-32DI: 32-point high-density DI, flat-cable connector, requires H-series terminal block adapter

Digital Output (DO) Modules

• H-4DO: 4-point relay output, 2A per point, 250VAC/30VDC rated, screw terminal base
• H-8DO: 8-point transistor output, NPN open-collector, 0.5A per point, 24VDC load
• H-16DO: 16-point transistor output module, source type, short-circuit protection per group

Analog I/O Modules

• H-4AI: 4-channel analog input, 4–20mA / 0–10V selectable, 12-bit resolution, isolated inputs
• H-2AO: 2-channel analog output, 4–20mA, 12-bit DAC, loop-powered output option
• H-4AIO: Combined 4AI/2AO module, mixed signal processing, single slot form factor

Communication & Network Modules

• H-LINK: Hitachi H-Link peer-to-peer network adapter, supports up to 32 nodes, coaxial bus topology
• H-RS232: Isolated RS-232C communication module, MODBUS RTU master/slave, 19.2kbps max
• H-RS485: RS-485 multi-drop communication adapter, up to 31 nodes, 115.2kbps, termination resistor onboard

Power Supply Modules

• H-PS24: 24VDC rack power supply, 5A output, over-current and over-voltage protection, DIN rail mount
• H-PS100: 100–240VAC input power supply module, 10A 5VDC bus output, hot-swap capable in redundant configurations

Sourcing Hard-to-Find & Obsolete CPM-E Parts

The Hitachi CPM-E series entered end-of-production status progressively between 2005 and 2012, with official Hitachi factory support for most CPU variants discontinued. However, the installed base in long-lifecycle industries — particularly refineries and chemical plants operating on 20–30 year maintenance cycles — creates sustained demand for replacement modules. DriveKNMS maintains a dedicated inventory of tested CPM-E CPU modules, I/O cards, and communication adapters sourced through authorized decommissioning channels and certified refurbishment programs. For obsolete variants such as CPM-2E and H-4DI, DriveKNMS provides functional equivalency assessments and cross-reference documentation to assist engineers in identifying compatible substitutes where direct replacements are unavailable. All sourced units are accompanied by test reports and a 12-month operational warranty.

Quality Control for the CPM-E Range

CPM-E modules present specific test challenges due to their proprietary backplane bus architecture and battery-backed SRAM configurations. DriveKNMS employs a dedicated H-series test rack replicating the original Hitachi backplane environment to perform full functional validation of each module prior to dispatch. The test protocol includes: CPU program memory read/write cycle verification, I/O bus communication integrity check at rated scan speeds, serial port loopback testing at all supported baud rates, analog channel calibration verification against NIST-traceable references (for AI/AO modules), and battery voltage and SRAM data retention testing for CPU modules with onboard memory backup. Modules failing any single test parameter are quarantined for component-level repair or returned to the decommissioning pool. No module is dispatched without a signed test record.

For CPM-E series availability, cross-reference support, or bulk procurement inquiries:

• Email: [email protected]
• WhatsApp: +86 18359293191
• Web: driveknms.com