Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | BALEXT-SMP |
| Manufacturer | KOKUSAI |
| Product Type | Main Control / Interface Board |
| Operating Voltage | 24V DC (Power Group) |
| Operating Temp | -30°C to +65°C |
| Humidity Range | 20% to 80% (Non-condensing) |
| Structure | Modular, Control Room Mount |
| Processor Type | Hard PLC Logic Processor |
| Weight | 0.23 kg |
| Certification | UL Listed |
| Signal Isolation | Optical/Magnetic via Semiconductor Modulation |
Product Introduction
KOKUSAI BALEXT-SMP serves as a primary control or interface board within KOKUSAI industrial automation systems. It handles signal modulation, isolation, and system coordination to ensure reliable data flow between field devices and the central controller.This board uses semiconductor-based modulation and optical/magnetic isolation to prevent ground loops and signal distortion. With an operating range down to -30°C and a compact 0.23 kg form factor, it maintains stability in harsh environments where standard logic boards might fail or produce erroneous data.
Installation & Configuration Guide
Preparation (10 min)
Verify the KOKUSAI BALEXT-SMP part number matches your existing unit exactly. Power down the entire control panel and lock out/tag out (LOTO) the 24VDC power supply. Gather a 24VDC multimeter and anti-static wrist strap.Removal (5–10 min)
Disconnect all field wiring and ribbon cables. Note the orientation before pulling. Remove mounting screws and slide the board straight out of the DIN rail or backplane connector. Inspect the backplane pins for corrosion or bending.Installation (10 min)
Align the KOKUSAI BALEXT-SMP with the backplane guides. Apply firm, even pressure until fully seated—do not force it at an angle. Reinstall mounting screws to prevent vibration loosening. Reconnect wiring according to your pre-removal notes.Power-On & Test (10 min)
Restore 24VDC power. Measure voltage at the board’s test points to confirm 24V DC ±10%. Check status LEDs for normal operation. Run a basic I/O check or system self-test to verify communication. If the board fails to initialize, recheck seating and power immediately.
Troubleshooting Quick Reference
| Symptom | Probable Cause | Action |
|---|---|---|
| No LEDs / No Response | 24VDC power failure or backplane fault | Measure 24V at board terminals. If present, board is likely dead. |
| Intermittent Communication | Loose backplane connection or ESD damage | Reseat board firmly. Inspect pins. Replace if issue persists. |
| Signal Distortion / Noise | Ground loop or failed isolation stage | Verify single-point grounding. Check shield continuity. Replace board if isolation is compromised. |
| System Crash / Data Corruption | Logic voltage fluctuation or board failure | Monitor 24V rail under load. If stable, swap with known-good KOKUSAI BALEXT-SMP. |
| Overheating | Blocked airflow or internal short | Ensure 50mm clearance. Feel for hot spots. Remove immediately if >65°C. |
Dimensions, Mounting & Wiring Notes
- Dimensions: Compact modular form factor (exact H×W×D varies by panel; verify mechanical drawing)
- Mounting: Control room DIN rail or backplane slot; control room installation only
- Wiring: 24VDC power group input; signal lines require proper shielding and single-point grounding to prevent induced currents in the shielding layer
FAQ
Is KOKUSAI BALEXT-SMP the same as BALEXT-SMP1?
Not necessarily. The “1” suffix often indicates a revision or functional variant. I’ve seen them used interchangeably in some panels, but in others, the pinout or firmware differs. Always verify against your existing board’s label and system documentation before swapping.Can I install this board in a high-vibration environment?
The spec says “control room installation,” which implies low vibration. If your panel is on a machine or in a high-vibration area, the backplane connector can fatigue over time. Use a locking clip or conformal coating on the connector if vibration is unavoidable.I installed a new BALEXT-SMP and it’s not responding. What now?
First, double-check the 24VDC at the board terminals. I’ve seen “24V” labels on power supplies that were actually 28V or dropping under load. If power is good, reseat the board. Sometimes a pin doesn’t make contact on the first try. If still dead, it’s likely a DOA unit—contact us for a replacement.Do you test these before shipping?
Yes. Every KOKUSAI BALEXT-SMP goes through our SOP: visual inspection, 24V power-on self-test, signal isolation verification, and a 24-hour load test on a dedicated KOKUSAI test rack. We generate a test report with each unit. Function is verified under test conditions, not guaranteed for life.Why is your price lower than the OEM?
We source new surplus and excess inventory directly from distributors and plant shutdowns. No middlemen, no marketing markup. You’re paying for a verified, tested board—not a brand name. We provide full traceability and a 12-month warranty, so the risk is minimal.What’s the return policy if it doesn’t fit?
We accept returns within 30 days if the board is unused and in original packaging. If we sent the wrong part, we cover return shipping. If you ordered incorrectly, you pay return freight. We’ll issue a refund or credit within 3 business days of receipt.
