I. Core Parameters (Easy to Understand)

CPU: MC68040, 32 MHz, 32-bit, FPU/MMU/8KB Cache

DRAM: 8MB FPM (Parity Check)

SRAM: 512KB Battery Backup (Powerful Backup During Power Loss)

Flash: 1MB

Bus: VMEbus A32/D64, Master/Slave, System Controller

Built-in I/O (Critical)

✅ 10 Mbps Ethernet (Built-in, with DMA)

❌ No Built-in SCSI (Requires IP or Subcard)

2 × Serial Ports: Console (EIA-232-D), EIA-232/422 Optional

✅ 4 × IndustryPack (IP) Expansion Slots (with DMA)

Environment: Industrial Grade 0–70°C, Shock Resistant, +5V Power Supply, Standard 6U VME

II. 531A vs 530A vs 523A (The Three Most Confusing Models)

MVME162-530A: 8MB DRAM; No onboard network port, no SCSI; 4×IP slots

MVME162-531A: 8MB DRAM; Onboard network port (yes), SCSI (no); 4×IP slots

MVME162-523A: 8MB DRAM; Onboard network port + SCSI (both are present); 4×IP slots

In one sentence: 531A = 530A + onboard network port; 523A = 531A + onboard SCSI.

III. Main Features

Integrated network + Strong Expansion: Onboard Ethernet + 4 IP slots, covering both network and I/O expansion

High Reliability: Industrial wide temperature range, shock-resistant, supports VxWorks, pSOS real-time systems

No integrated storage: No onboard SCSI, suitable for scenarios with network but no local storage requirements

Good Real-time Performance: MC68040 + VMEbus, strong hard real-time control capability

IV. Typical Applications

Industrial DCS/PLC, process control (requires network + multiple I/O expansion)

Embedded real-time control, robots, military/aviation, communication

Scenarios requiring onboard Ethernet + multiple IP expansion, without onboard SCSI

V. Spare Parts and Alternatives

Model: MVME162-531A (Spare part number: 01-W3960Bxxx)

Direct replacement:

Downward: MVME162-530A (no network port)

Upward: MVME162-523A (with SCSI)

Compatible replacement: Can directly replace 522A/530A (VME/IP slot compatibility)