Description
Product Introduction
The Pro-Face GP450-EG12 is a classic 10.4-inch industrial human-machine interface (HMI) built by Digital Electronics Corporation (Pro-Face). Deployed across thousands of manufacturing plants throughout the late 1990s and 2000s, this workhorse terminal displays real-time machine telemetry, process alarms, and operator entry fields on its high-contrast VGA monochrome LCD screen.
Engineered to endure severe plant environments, the GP450-EG12 features a heavy-duty NEMA 4X / IP65 rated front bezel that resists oil, dust, and washdown spray. Its internal architecture utilizes direct serial driver protocols (RS-232C and RS-422) to maintain continuous high-speed communication polling with major PLC platforms, including Allen-Bradley, Mitsubishi, Omron, and Siemens.
Key Technical Specifications
| Parameter | Specification |
| Model Code | GP450-EG12 |
| Display Size & Type | 10.4-inch Monochrome LCD (VGA 640 × 480 pixels, 16 shade levels) |
| Touch Screen Type | Matrix Resistive Touch Film (32 × 24 resolution grid) |
| Input Voltage | 100V AC to 240V AC (50/60 Hz wide-range power supply) |
| Power Consumption | Max 50VA |
| Serial Communication | 1× RS-232C / RS-422 selectable (25-pin D-sub female connector) |
| Auxiliary Interfaces | Tool port for screen downloading, Printer/Bar-code interface |
| Front Panel Rating | IP65f / NEMA Type 4X / 12 equivalent (when panel mounted) |
| Operating Temperature | 32°F to 122°F (0°C to +50°C) |
Application Scenarios & The “Trench” Experience
The “Trench” Reality
It’s 2:00 AM on a high-speed metal stamping line. An old GP450 terminal loses its screen contrast due to a failed CCFL backlight or burnt inverter, leaving operators blind to press positioning and die protection alarms. Rewiring the cabinet door for a modern widescreen panel, converting the legacy GP-PRO/PB III software file, and re-mapping serial addresses would take days of engineering time. You need an exact drop-in GP450-EG12 unit that fits the 10.4-inch cutout, mates directly with the 25-pin serial cable, and boots the machine immediately.
Target Applications
- Stamping & Metal Fabrication – Serving as a rugged press control terminal handling real-time crank angle displays and tonnage alarms.
- Plastics Injection Molding – Displaying barrel heating zone profiles, injection pressure curves, and core-pull sequences.
- Legacy Material Handling & Conveyors – Monitoring sorting gates, photo-eye states, and motor starter faults across long serial cable runs.
Field Replacement Case
A automotive parts supplier faced complete line stoppage when an aging GP450-EG12 lost touch grid accuracy, preventing operators from pressing the “Cycle Start” key. Swapping in a bench-tested, refurbished -EG12 restored immediate matrix touch alignment. Moving the original system memory card over eliminated the need for software downloads or communication adjustments.
GP450-EG12
GP450-EG12
Transparency SOP: Quality Assurance & Testing
We test every legacy HMI terminal on specialized bench setups before approving it for inventory:
- Inbound Visual & Chassis Audit: Complete teardown inspection for bezel cracking, mounting clip boss fractures, seal degradation, and PCB solder fatigue.
- High-Voltage Power Supply Check: Applying 100-240V AC to verify stable internal DC voltage rails (+5V logic, +12V display) under varying load conditions.
- Display & Touch Grid Calibration: Testing CCFL backlight output, LCD contrast adjustment, and executing a full matrix touch accuracy test across all 32×24 grid cells.
- Serial Communication Stress Run: Exercising the 25-pin D-sub port under continuous PLC polling simulation across RS-232C and RS-422 modes.
- ESD Cleaning & Packaging: Solvent bath cleanup of front overlay, followed by vacuum sealing in static-shielding ESD bags with foam padding.
The Veteran’s Tech Trap Guide
⚠️ Trap 1: Mind the 25-Pin D-Sub Port Configuration
The uses a 25-pin D-sub serial connector that handles both RS-232C and RS-422 communications depending on your dip switch settings and cable pinout. Before powering on a replacement unit, verify the rear DIP switch positions match your original board exactly. Setting switch 1-1 or 1-2 incorrectly will cause a “COMMS ERROR” or prevent the PLC from connecting.
❗ Trap 2: Software Version Locking (GP-PRO/PB III)
The software project inside a cannot be edited with modern GP-Pro EX software without converting the project file. If you are uploading or downloading project files from this panel, you must use legacy GP-PRO/PB III (C-Package) software and an appropriate tool port cable (GP-230-IS11-0 or USB transfer equivalent).
⚠️ Trap 3: Check Contrast Potentiometer / Key Settings
If the screen on your replacement unit appears completely blank or dark black upon boot, don’t panic—the hardware likely isn’t dead. The contrast setting on monochrome LCDs shifts depending on ambient cabinet temperature. Adjust the contrast controls via the system menu or physical dial on the housing until the text comes into focus.
Frequently Asked Questions
Q: Is theFace still manufactured by Digital/Pro-Face?
No. The GP400 series is an obsolete legacy product family. We source, overhaul, and bench-test pre-owned and new-surplus units so you can keep critical equipment running without executing an expensive cabinet redesign or PLC communication upgrade.
Q: What is the primary difference en a and a -LG11?
The suffixes denote screen technology and input power variat The features a high-contrast EL or monochrome LCD panel powered by 100-240V AC line power, whereas other variants may utilize color screens (TFT) or 24V DC power inputs.
Q: Can I transfer my project file using a standard USB flash drive?
The predates standard USB flash drive ports on HMIs. Memory transfers are performed using proprietary Pro-Face SRAM memory cards or directly over a serial connection via the dedicated tool port.
Q: Can I hot-swap this panel while cabinet AC power is live?
No. To be honest, wiring or unplugging 100-240V AC power leads while live presents an arc hazard and can damage the internal power supply board. Always disconnect power before servicing the panel.
Q: What warranty covers your refurbished terminals?
Every psted unit comes backed by our full 12-month direct replacement warranty from our stocked surplus inventory.
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