SECOM 787 Series Modules

Technical Dossier

Product Details And Specifications

SECOM 787 Series: Comprehensive Module Range and Technical Overview

The SECOM 787 Series represents a mature, field-proven platform deployed across heavy industrial environments including petrochemical refineries, nuclear power facilities, offshore platforms, and large-scale chemical processing plants. Engineered for high-reliability distributed control applications, the 787 Series has accumulated significant installed base across Asia-Pacific and European industrial sectors. Its modular backplane architecture supports mixed I/O configurations within a single rack, making it a preferred platform for complex process control loops where signal density and channel isolation are critical parameters. The series operates within standard DCS cabinet environments and interfaces with SECOM's proprietary communication bus, enabling deterministic scan cycles essential for safety-instrumented and regulatory-compliance applications.

The Evolution of 787 Series Architecture

The SECOM 787 Series was introduced as part of SECOM's second-generation distributed control platform, succeeding earlier relay-logic and discrete controller architectures. Early 787 variants established the foundational backplane bus protocol and rack form factor that remained consistent across subsequent hardware revisions, ensuring backward compatibility for field installations spanning multiple decades. Mid-generation revisions introduced enhanced diagnostic registers, expanded channel counts on analog I/O modules, and improved EMI shielding specifications to meet IEC 61000-series immunity requirements. Later production runs incorporated firmware-level enhancements for HART pass-through on analog input modules, extending instrument asset management capability without hardware replacement. As the 787 Series has entered its mature-to-end-of-life phase, SECOM has transitioned active development to successor platforms; however, the 787 Series remains in active service at thousands of installations globally. Compatibility between early and late production modules is generally maintained at the backplane level, though firmware version alignment must be verified when mixing module generations within a single rack. Sourcing certified replacement modules is the primary maintenance challenge for 787 Series operators.

787 Series Full Catalog & Functionalities (SKU List)

The following SKUs represent the core module range of the SECOM 787 Series, classified by functional category. All models listed are verified members of the 787 platform family.

Controller & CPU Modules

• 787CPU: Main processor module; executes control logic and manages rack communication bus.
• 787CPE: Enhanced CPU variant with expanded memory and faster scan cycle for high-density applications.
• 787CPC: Redundant CPU module; pairs with primary CPU for hot-standby failover configurations.

Analog Input Modules

• 787AIE: 8-channel analog input; 4–20 mA, 1–5 V; supports HART pass-through on all channels.
• 787AIM: 16-channel analog input; multiplexed scanning; suitable for high-density temperature monitoring.
• 787AIT: Thermocouple input module; supports J, K, T, E, R, S, B type; cold junction compensation onboard.
• 787AIR: RTD input module; 3-wire and 4-wire PT100/PT1000 configurations; 8 channels.

Analog Output Modules

• 787AOE: 8-channel analog output; 4–20 mA; loop-powered with open-loop detection per channel.
• 787AOM: 4-channel high-accuracy analog output; 16-bit resolution; used in precision flow control loops.

Digital Input Modules

• 787DIE: 32-channel digital input; 24 VDC; optically isolated; suitable for field contact monitoring.
• 787DIM: 16-channel digital input; 120 VAC; for direct interface with AC field devices.
• 787DIS: 32-channel digital input with SOE (Sequence of Events) timestamping; 1 ms resolution.

Digital Output Modules

• 787DOE: 32-channel digital output; 24 VDC sourcing; 0.5 A per channel; short-circuit protected.
• 787DOM: 16-channel relay output; SPDT contacts; rated 2 A at 250 VAC for motor starter and valve applications.

Communication & Interface Modules

• 787TCE: Touchpad/terminal communication interface module; provides local operator interface connectivity and diagnostic port access for rack-level maintenance operations.
• 787CME: Modbus RTU/TCP communication adapter; bridges 787 Series backplane to third-party SCADA and historian systems.
• 787PFE: PROFIBUS DP slave adapter; enables integration of 787 I/O into PROFIBUS master architectures.

Power Supply Modules

• 787PSE: 24 VDC rack power supply; 10 A output; wide-range AC input 85–264 VAC.
• 787PSR: Redundant power supply module; hot-swap capable; pairs with 787PSE for uninterrupted rack power.

Sourcing Hard-to-Find & Obsolete 787 Series Parts

As the SECOM 787 Series has progressed into its end-of-active-production phase, OEM channel availability for specific modules — particularly low-volume communication adapters, SOE input modules, and redundant CPU units — has become constrained. DriveKNMS maintains a dedicated inventory of tested 787 Series modules sourced through certified industrial surplus and decommissioned plant asset channels. All units undergo functional verification prior to listing. DriveKNMS provides lifecycle extension support for 787 Series installations, including cross-reference identification for modules where the original part number has been superseded or consolidated into a later SECOM platform designation. For operators managing long-term maintenance contracts on 787 Series-equipped facilities, DriveKNMS offers reserved stock arrangements and priority allocation for critical spare categories including CPU, power supply, and SOE modules. Inquiries for bulk quantities, specific firmware revisions, or documentation packages should be directed to the sourcing team directly.

Quality Control for the 787 Series Range

The SECOM 787 Series employs a proprietary backplane bus protocol with strict timing and impedance requirements. DriveKNMS applies a dedicated test procedure for all 787 Series modules that includes backplane connector integrity inspection, bus termination resistance verification, and functional I/O channel testing under simulated load conditions. For communication modules such as the 787TCE and 787CME, protocol handshake verification is performed using SECOM-compatible test fixtures to confirm correct frame formatting and response timing. Analog modules are calibrated against traceable reference standards with full-range linearity checks across all channels. Digital I/O modules are tested for correct optocoupler response, output driver integrity, and channel-to-channel isolation. All modules are inspected for capacitor condition, solder joint integrity, and conformal coating status before dispatch. Test records are retained and available upon request for quality-critical procurement processes.