Model: CPU/NA386 G.D 15AD80H0001
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Technical Dossier
The GD Bologna NA386 series represents a generation of industrial CPU and I/O control boards deployed extensively across heavy-process industries including petrochemical refineries, chemical processing plants, nuclear power auxiliary systems, and continuous-operation manufacturing lines. Manufactured by GD Bologna (General Drives Bologna), an Italian industrial automation specialist, the NA386 platform was engineered for deterministic real-time control in environments demanding high reliability and long operational lifecycles. Its backplane architecture and bus communication design made it a standard reference in European DCS and PLC hybrid installations throughout the 1990s and 2000s. Today, the NA386 series occupies a critical position in the installed base of aging industrial infrastructure globally, with many facilities operating original hardware under extended maintenance contracts.
The NA386 platform was developed during the transition from proprietary 8-bit industrial controllers to 16/32-bit open-architecture processing boards. The series adopted the Intel 80386 processor family as its computational core — a deliberate choice that aligned with the industrial computing standards of the era and provided a stable, well-documented instruction set for real-time operating environments. Early NA386 boards operated on passive backplane architectures with parallel bus communication, providing deterministic scan cycles suitable for process control loops. As the series matured, GD Bologna introduced enhanced variants with expanded memory addressing, improved watchdog timer circuits, and refined analog signal conditioning on integrated I/O boards.
Compatibility across NA386 sub-variants is constrained by backplane slot assignments, bus termination requirements, and firmware revision levels. Mixing early-generation CPU boards (e.g., 15AD80H0001 revision A) with later-generation I/O modules requires verification of bus protocol compatibility. The series reached end-of-production status, with GD Bologna transitioning customers toward successor platforms; however, no direct drop-in replacement exists for the NA386 backplane form factor, making original spare parts the only viable option for facilities unwilling to undertake full system migration.
The following SKUs represent the documented NA386 series module range. Each entry reflects a distinct functional role within the NA386 control architecture:
CPU/NA386 G.D 15AD80H0001: Main CPU board, Intel 80386 core, real-time process control.
CPU/NA386 G.D 15AD80H0002: CPU board variant, extended RAM addressing, enhanced watchdog.
CPU/NA386 G.D 15AD80H0003: CPU board, dual-port memory option, redundancy-capable.
DI/NA386 G.D 15AD81H0001: 16-channel digital input module, 24VDC, isolated.
DI/NA386 G.D 15AD81H0002: 32-channel digital input module, high-density backplane mount.
DO/NA386 G.D 15AD82H0001: 16-channel digital output module, relay contact, 2A per channel.
DO/NA386 G.D 15AD82H0002: 16-channel digital output module, transistor output, 24VDC.
AI/NA386 G.D 15AD83H0001: 8-channel analog input module, 4–20mA, 12-bit resolution.
AI/NA386 G.D 15AD83H0002: 8-channel analog input module, ±10V, differential input.
AI/NA386 G.D 15AD83H0003: 16-channel analog input module, multiplexed, 12-bit ADC.
AO/NA386 G.D 15AD84H0001: 4-channel analog output module, 4–20mA, 12-bit DAC.
AO/NA386 G.D 15AD84H0002: 8-channel analog output module, ±10V, isolated outputs.
COM/NA386 G.D 15AD85H0001: Serial communication adapter, RS-232/RS-485, Modbus RTU.
COM/NA386 G.D 15AD85H0002: Profibus DP communication module, slave mode, 12Mbps.
PSU/NA386 G.D 15AD86H0001: Backplane power supply module, 24VDC input, 5V/±15V output.
PSU/NA386 G.D 15AD86H0002: Redundant power supply module, hot-swap capable, fault relay output.
MEM/NA386 G.D 15AD87H0001: Memory expansion module, SRAM, battery-backed, 512KB.
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