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Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | A413140 (BIU-8) |
| Alternative Part Numbers | 20586590, VAT 65427829A, VAT 65427829B, A413140 07 20586590 |
| Module Type | Binary Input Unit (BIU-8) |
| Number of Channels | 8 discrete input channels |
| Input Voltage | 24 VDC nominal (typical for Cisel/Valmet DI modules) |
| Input Type | Sinking or sourcing (depends on system wiring; verify with manual) |
| Logic Levels | 0 VDC = OFF; 24 VDC = ON (typical threshold ~10–15 VDC) |
| Isolation | Channel-to-channel and channel-to-backplane isolation (typical for Cisel I/O) |
| Flammability Rating | 94V-0 (UL 94 vertical burn test) |
| Material Code | T120 94V-0 |
| Mounting | DIN-rail or subrack mount (Cisel/Valmet I/O chassis) |
| Connector Type | Screw terminal block or pluggable connector (varies by revision) |
| Dimensions (approx.) | ~100 mm × 60 mm × 25 mm (varies by revision) |
| Weight | 140 g (0.14 kg) |
| Operating Temperature | 0°C to +55°C (typical for industrial I/O modules) |
| Storage Temperature | −20°C to +70°C |
| Humidity Rating | 5–95% RH, non-condensing |
| Country of Origin | Finland |
| Compatible Systems | Metso Cisel Automation, Valmet DCS, Neles Automation legacy systems |
| Typical Use | Discrete field signals: switches, proximity sensors, status contacts, limit switches |
Product Introduction
The Metso A413140 (BIU-8) is an 8-channel binary (discrete) digital input module used in Metso Cisel and Valmet automation systems. It accepts 24 VDC field signals from switches, proximity sensors, and status contacts, providing isolated digital inputs to the controller layer in power, petrochemical, and pulp & paper plants.
This module is chosen for its compact 8-point density, 94V-0 flammability rating, and proven reliability in legacy Metso/Valmet DCS installations where replacement availability is critical. The A413140 is also cross-referenced as VAT 65427829A/B and 20586590, making it a direct replacement for older Valmet and Neles Automation I/O cards.
A413140
A413140
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| All inputs read “0” or frozen | Module power supply or backplane communication fault | ❌ Low | Measure 24 V DC at module power terminals; check controller I/O status | Check PSU, fuses, and backplane communication before replacing module |
| Single input stuck ON/OFF | Field wiring open/short or sensor failure | ❌ Low | Measure voltage at input terminal with field device activated; check sensor | Repair field wiring or replace sensor; module likely OK |
| Intermittent input dropouts | Loose terminal block or backplane contact | ⚠️ Medium | Reseat module and terminal block; inspect terminals for corrosion | Clean contacts, reseat firmly; replace only if problem persists after reseating |
| Input channel reads inverted logic | Sinking vs. sourcing wiring mismatch | ⚠️ Medium | Verify field wiring polarity and common voltage reference | Correct wiring to match module input type (sinking/sourcing) |
| Module fails after swap | Wrong voltage type (24 VDC vs. 120 VAC) or channel count mismatch | ✅ High | Compare old module label (A413140, BIU-8, VAT number) before removal | Match exact part number and input type on replacement |
| ERR or COMMS LED flashing | Module not communicating with controller | ✅ High | Read I/O diagnostic buffer in Cisel/Valmet engineering tool | Usually requires module replacement or configuration check |
If you’re stuck, send photos of the module label, terminal block wiring, and any controller I/O diagnostic screens. We’ll review them before you commit to a swap.
Frequently Asked Questions (FAQ)
Q: What’s the difference between A413140 and BIU-4 (A413146)?
A: The (BIU-8) is an 8-channel binary input module, while the A413146 (BIU-4) is a 4-channel version. Both are part of the Metso/Valmet Cisel I/O family and use similar 24 VDC input architecture, but the BIU-8 offers double the channel density in the same footprint.
Q: Is this module hot-swappable?
A: No. Metso Cisel/Valmet I/O modules are not designed for hot-swap. Pulling or inserting them under power can damage the backplane or adjacent modules. Follow your plant’s approved procedure—usually this means taking the I/O rack or controller offline before swapping.
Q: Can I use this module in non-Metso/Valmet PLC systems?
A: No. The is built for Metso Cisel and Valmet automation backplanes and communication architecture. It won’t work in Allen-Bradley, Siemens, or other vendor racks without significant reconfiguration and custom interfacing.
Q: Will my I/O mapping and logic survive a module swap?
A: Yes. The I/O addresses and logic live in the controller memory, not on the input module itself. As long as you replace it with the same type and keep wiring identical, the I/O map remains valid. Always back up your controller database before hardware changes.
Q: Why is this cheaper than buying direct from Metso?
A: This is new surplus or inspected stock from decommissioned systems and authorized distributors. It’s genuine Metso/Valmet hardware, function-tested, but sold as surplus rather than factory-direct new. That’s why the price is lower while still carrying a 1-year replacement warranty.
Q: What condition is the unit in—new, used, or refurbished?
A: We list each unit explicitly: “New Original / New Surplus” means factory-sealed or unused surplus with original packaging; “Refurbished (tested)” means cleaned, electrically tested, and verified functional on a Metso Cisel/Valmet I/O test rig. The product page or quote will state which applies.
Q: Do you provide test reports or power-up videos?
A: Yes. For refurbished units, we can supply a basic functional test report (power-on self-test, communication handshake, sample input channel verification with 24 VDC signals) and short power-up video on request. Just ask before purchase.
