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Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | SM128V (ibaLink-SM-128V-i-2o) |
| Manufacturer | iba AG, Germany |
| Board Type | Multi-purpose bidirectional VMEbus interface card |
| Fiber Link 1 | Bidirectional, 64 analog + 64 digital inputs/outputs |
| Fiber Link 2 | Unidirectional, 64 analog + 64 digital outputs |
| Sync Rate | 1 ms, all channels on both links |
| Cascading | Address switches allow up to 8 SM128V cards on Link 1 |
| Compatible I/O | ibaFOB-io, ibaFOB-4i(-S), ibaFOB-4o; ibaPADU-8-IO series; ibaNet750-BM series |
| VME Systems | VME32 and VME64 |
| Power Supply | 5 V DC, drawn from VMEbus |
| Address Space | 256 kByte on VMEbus |
| VME Access Modes | A24/A32; D08 (E0), D16, D32; A40 MD32 on special request |
| Standards | VMEbus, IEEE 1014-1987, VME64, ANSI VITA 1-1994 VME64X, VITA 1.1 |
| Operating Temp. | 0 °C to +60 °C (typical industrial rating — confirm on nameplate) |
Product Introduction
Every ibaPDA system I’ve commissioned in the last twenty years has one thing in common: when the plant floor starts reporting garbage, someone eventually points at the link card. The SM128V is that card. It sits in a VME32 or VME64 slot, pulls 5 V straight off the backplane, and drives two fiber links — one bidirectional carrying 64 analog and 64 digital I/O, one unidirectional carrying 64 analog and 64 digital outputs. All of it synchronized at a 1 ms rate. That 1 ms figure is the number that matters. It’s what lets ibaLogic SoftPLC close a control loop over fiber without the jitter you’d get from a serial or Ethernet-based link.Engineers pick it for the cascading. Eight SM128V cards on Link 1 via address switches gives you 512 synchronized channels from a single VME slot — which is how a 900-point boiler furnace temperature survey gets built without a rack explosion. Honest caveat: this is a passive board. It makes no active VME accesses, and BLT/MBLT plus auto-configuration and geographic addressing were never finished. If your CPU driver expects those, it won’t work. Check your host software before ordering.
Quality SOP & Tech Pitfalls
The Lab Report (SOP)
- Visual / counterfeit check — silkscreen font, part marking, and serial compared against OEM reference photos. Anti-static bag and seal inspected for re-packaging. Old VME stock gets relabeled often.
- Live test on test rack — seated in a VME64 test backplane, 5 V rail confirmed, status LEDs observed through boot.
- Fiber link test — both optical ports exercised with a known-good ibaFOB or ibaPADU endpoint. Link 1 bidirectional traffic verified; Link 2 output verified.
- Insulation & continuity — Fluke 1508 for insulation to chassis, Fluke 115 for connector pin continuity. Catches moisture and transport damage.
- Firmware/HW revision logging — read and photographed, screenshot filed with the shipment.
- Anti-static sealing — wrist strap on, ESD bag, foam-packed box.
The Engineer’s Warning (Pitfalls)Two mistakes cause most of the downtime I’ve seen on this board.First: the address switch. Eight cards can cascade on Link 1, and each needs a unique address. I once spent a Saturday on a line where a replacement card came up with no fiber link. The board was fine. The tech had set the address switch to match another card already on the link. Two duplicate addresses, silent failure, no error LED. Ten minutes with the manual would have saved the weekend.Second: assuming it’s an input card. A maintenance manager bought “SM128V” from a listing claiming 128 analog inputs, expecting to replace a failed thermocouple module. It’s a link card. It has no sensor terminals at all. The plant lost three weeks of procurement time on a part that could never have done the job.
Installation & Configuration Guide
Phase 1 — Pre-Installation (⚠️)
- ⚠️ Shut down the VME host system and remove chassis power. VME slots are not hot-swappable on most ibaPDA architectures.
- ⚠️ Wait 5 minutes for backplane capacitors to discharge. Verify 0 V at the slot with a multimeter.
- ⚠️ Photograph the old card: silkscreen part number, address switch/DIP positions, fiber port labels (which fiber is Link 1, which is Link 2), and slot number.
- Back up the host configuration and ibaPDA/ibaLogic project before removal.
Phase 2 — Removal
- Label both fiber cables at the connector — Link 1 and Link 2 are not interchangeable.
- Release the ejector levers evenly and pull straight out. Do not pry one side; you’ll bend the connector pins.
- Record the slot number. VME addressing is slot-dependent.
Phase 3 — Installation
- Set the address switch to match the old card exactly, before seating it. Compare against your photo. This single step prevents 90% of startup failures on cascaded links.
- Verify the new card’s hardware revision against the old one. A revision jump can change link behavior.
- Seat the card fully into the slot and engage both ejector levers.
Phase 4 — Power-On & Testing
- Restore chassis power. Confirm 5 V at the slot, not just at the supply.
- Watch the status LEDs. Link LEDs should indicate fiber lock within a few seconds.
- In ibaPDA/ibaLogic, confirm all 128 channels on Link 1 and 64 outputs on Link 2 appear and are updating.
- Force a known digital output, confirm it arrives at the ibaFOB/ibaPADU endpoint.
- Log the firmware version in your maintenance record.
Compatible Replacement Models
| Tier | Model | Notes |
|---|---|---|
| ✅ Drop-in | SM128V (ibaLink-SM-128V-i-2o), same HW rev | 100% match. Address switch must be set identically. Price varies widely — quote at least two sources. |
| ⚠️ Software Compatible | Later ibaLink VME cards (e.g. ibaLink-SM series revisions) | Same physical form factor, but may require a driver or firmware update on the host. Budget 4–8 hours of engineering time plus a commissioning window. |
| ❌ Hardware Mod Required | ibaNet750-BM / ibaPADU-based Ethernet architectures | Different bus, different wiring, different engineering environment. Only make this move as a planned plant upgrade — not as a breakdown repair. |
Frequently Asked Questions
Is this still available new, or is it obsolete stock?
Obsolete. Distributor catalogs list SM128V as discontinued by the manufacturer. What’s on the market is New Surplus — factory-sealed old stock, not current production. We state the condition on every quote rather than hiding behind the word “new.”Is SM128V a 128-channel input module?
No. This is the single biggest misconception in the reseller listings. It’s a VMEbus fiber interface card. The “128” refers to 64 analog plus 64 digital channels carried over the fiber link — not sensor terminals on the board. It has no thermocouple or 4–20 mA inputs. If you need sensor inputs, you want an ibaFOB or ibaPADU module, not this.Can I hot-swap it safely?
No. VME slots on ibaPDA systems are generally not hot-swappable. Full chassis shutdown, power removed, five-minute discharge wait.What’s the most common reason a replacement won’t work?
Duplicate address switch setting on a cascaded Link 1. Eight cards can share that link, and each needs a unique address. Set it wrong and the link stays silent with no error indication. Check the old card’s switch position before you install.Does it support BLT/MBLT or geographic addressing?
No. The OEM manual states those modes were “in preparation” but never became available, and 2eVME is not implemented. Only non-privileged data access works. If your CPU driver requires BLT, this board won’t satisfy it.Do you test before shipping?
Yes — live test on a VME64 test rack, both fiber links exercised against a known-good endpoint, insulation resistance with a Fluke 1508, and firmware logging. Ask for the test report and we send it.What does the warranty cover?
12 months from delivery. Non-human-caused failure in that window: we replace it and cover return freight. Damage from overvoltage, wrong address settings, or ESD isn’t covered — but we’ll still help you troubleshoot, free.
