Model Definition

• 0-54339: Basic memory board family

• -8: Hardware revision 8 (intermediate, between -6 and -10)

• Status: Discontinued; less common than -10/-14/-17

• Cross‑References: -6 (older), -10/-14/-17 (newer); -17 is recommended drop‑in replacement

Technical Specifications

• Power: 5 VDC from backplane, ~6.5 W

• Form Factor: 3U PCB (248 × 171 × 25 mm)

• Weight: ~0.65 kg

• Operating Temp: 0 °C to +55 °C

• Memory: 16 KB SRAM (volatile, battery‑backed)

• Battery: 3.6 V lithium (data retention ~5 years)

• Components: 55+ ICs (mid‑generation), resistor arrays, capacitors

• Diagnostics: Single LED (power/memory status); standard test points

Interfaces & Communication

• Backplane: 3U edge connector (compatible with all AutoMax/Automate 31 racks)

• Memory Bus: 16‑bit parallel interface

• Battery Connector: Onboard socket for backup battery

• No External Ports: All I/O via backplane

Key Features

1. 16 KB Battery‑Backed SRAM: Standard capacity for Automate 31 systems

2. Mid‑Rev 8 Hardware: Improved PCB layout and noise immunity over rev‑6; less robust than rev‑17

3. Backward Compatible: Fits all Automate 31 CPUs (0-53107, 57C430/431/435) and backplanes

4. Industrial Durability: Built for harsh factory environments (steel, paper, mining)

5. Legacy Replacement: Direct swap for older systems; upgrade to -17 advised for longevity

Application

• PLC Systems: Automate 31 PLC racks (primary memory module)

• Drive Systems: AutoMax/MaxPak AC/DC drives (parameter storage, control logic)

• Industries: Steel, paper, mining, machine tools, cranes, conveyors

• Use Cases: Retrofits, replacements for failed rev‑6 boards, system spares

Compatibility

• Compatible Systems: AutoMax/MaxPak Drives, Automate 31 PLC

• Compatible CPUs: 0-53107, 57C430, 57C431, 57C435

• Backplane: 3U slot in standard Reliance rack

Critical Notes

• Revision Evolution: -8 fixed early rev‑6 issues but lacks rev‑17’s thermal and component upgrades

• Replacement: 0-54339-17 is the preferred direct replacement (higher reliability, same 16 KB)

• Availability: -8 is less common than -10/-14/-17; sourcing lead times may be longer