Overview
The Spectrum Controls SOI-200AB-120A-16K-485-PP is a compact operator interface panel featuring a 4×20 character LCD display, 16K program memory, and dual RS-422 serial communication ports. Designed for industrial control systems, this HMI enables real-time monitoring and command input on legacy and retrofit automation platforms. Though discontinued by the manufacturer, the SOI-200AB series remains in wide use across machine tool, process control, and packaging equipment applications.
Key Features
- 4×20 Character LCD Display — Clear, readable text output for status, diagnostics, and user prompts
- 16K Program Memory — Sufficient capacity for multi-screen applications and logic routines
- Dual RS-422/485 Serial Ports — Industry-standard serial communication for networked control integration
- 120VAC Input — Single-phase AC power; low current draw (75mA nominal)
- Bracket-Mount Enclosure — Compact footprint designed for panel cutout or wall mounting
- Robust Industrial Design — Built for factory floor environments with sealed bezel and tactile keys
Technical Specifications
| Specification | Value |
| Model Number | SOI-200AB-120A-16K-485-PP |
| Manufacturer | Spectrum Controls (Spectrum Control Inc.) |
| Display Type | 4×20 character LCD |
| Program Memory | 16K bytes |
| Input Power | 120VAC, single phase |
| Power Consumption | 75mA nominal |
| Serial Communications | RS-422 (dual ports) |
| Enclosure Type | Bracket-mount with sealed bezel |
| Status | Discontinued by manufacturer |
Typical Applications
- Machine Tool Control — CNC retrofit, spindle control, and positioning feedback
- Process Monitoring — Real-time display of temperature, pressure, flow, or fill levels
- Packaging & Assembly Lines — Count displays, cycle status, and operator messaging
- Legacy System Maintenance — Direct replacement for worn or failed SOI-200 series units
- Serial Network Integration — Multi-device supervisory control via RS-422 backbone
Compatibility & Replacements
Compatible With
- Allen-Bradley Micro Logix, SLC 500, and CompactLogix controllers (via RS-422 serial gateway)
- Siemens S7-200, S7-300 automation platforms
- Omron C-series PLCs with serial I/O modules
- MODBUS RTU and other RS-422 serial protocols
- Standard 120VAC single-phase industrial power supplies
Replaces / Drop-In Replacement For
- Spectrum Controls SOI-200AB-120A-16K-485 (non-PP variant)
- SOI-200AB-120A-16K-232 (where RS-422 replaces RS-232)
- Older SOI-200-AB series panels with identical faceplate cutout dimensions
Works With
- Communication Protocols: RS-422, RS-485, MODBUS RTU
- Configuration Software: Spectrum Controls proprietary operator panel software (legacy)
- Mounting Standards: DIN rail enclosures, wall-mount brackets, NEMA 4X stainless steel panels
- Power Architecture: 120VAC single-phase UPS-backed supplies, variable-frequency drive (VFD) auxiliary output
