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Key Technical Specifications
- Part Number: 502-03944-00
- Drawing/Revision Number: M.1016.9428 R13
- Platform: PIC900 module family
- Host System: Giddings & Lewis 8000/9000-series CNC control
- Function: SERCOS ring/interface module — a closely related suffix (502-03944-10) is documented as a one-ring SERCOS interface module, which strongly suggests this family’s role, though the exact -00 configuration should be confirmed against your drawing set
- Electrical Ratings: Not independently verified for this part number — treat any current/voltage figures you see quoted elsewhere with caution and confirm against the physical nameplate or the G&L drawing package before specifying a power source
- Form Factor: PIC900 rack-mount module (per platform convention)
- Documentation Status: No public OEM datasheet located; identification here is based on part-number family matching, not a confirmed spec sheet
Product Introduction
The Giddings & Lewis 502-03944-00 is a PIC900-family interface module built for the 8000/9000-series CNC control platform, most likely a SERCOS ring interface based on its part-number family relationship to the documented 502-03944-10 module. G&L’s PIC900 rack system handles remote I/O and servo networking on these legacy machine tool controls.
Shops still running 8000/9000-series G&L controls buy this part because the CNC platform is long out of factory production, and PIC900 modules aren’t cross-compatible with newer G&L control generations. Confirming the exact drawing revision against your existing card is the difference between a drop-in replacement and a rework.
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| CNC reports SERCOS ring fault or loss of communication | Fiber-optic connector fault or failed ring module | ✅ High | Inspect fiber connectors for contamination/damage, check ring status LEDs if present | Clean and reseat fiber first; swap module if fault persists |
| Servo axis drops out intermittently | Ring degradation causing dropped telegrams, not necessarily this module | ✅ Moderate | Check for correlating faults across multiple axes on the same ring | If isolated to one axis, suspect the axis drive; if ring-wide, suspect this module |
| No power/status indication on the module at all | Backplane power fault, not the module itself | ❌ Low | Verify rack power rails at an adjacent known-good slot | Rule out rack power before condemning this module |
| CNC boots but flags a configuration mismatch for this slot | Wrong module variant or revision installed for this rack position | ✅ High | Compare your drawing revision (M.xxxx.xxxx Rx) against what’s physically installed | Confirm exact revision match before powering up |
| Random comm errors across the whole ring, not one module | System-wide fiber routing, grounding, or noise issue | ❌ Low | Check whether faults are isolated to one node or spread across the ring | Investigate shared ring wiring/grounding first |
If the issue doesn’t resolve, contact technical support with your CNC’s fault log, a photo of the module’s nameplate and drawing revision, and the exact rack slot position so compatibility can be confirmed before replacement.
502-03944-00
Frequently Asked Questions (FAQ)
Is this confirmed as a SERCOS ring module, or is that a guess?
It’s a strong inference, not a confirmed spec — this part number sits in the same 502-03944 family as a documented one-ring SERCOS interface module (502-03944-10), and the “-00” suffix likely denotes a different ring configuration or an earlier hardware revision. Get your existing module’s drawing number and revision letter to compare before ordering.
Will this drop in for my exact G&L 8000/9000 CNC, or do I need to match the revision?
Match the revision. The M.1016.9428 R13 marking matters as much as the base part number — G&L revised these modules over their production run, and a mismatched revision can cause a configuration fault even if the base part number lines up.
Why can’t you give me exact voltage/current ratings for this part?
Because there’s no public datasheet for this internal G&L part number, and the ratings floating around online for the closely related -10 variant look like generic distributor template data rather than a verified spec for this specific module. Pull the ratings straight off the module’s nameplate rather than trusting a secondhand number.
Is this new, or a surplus/pulled part?
Given the platform’s age, expect New Surplus or tested surplus stock rather than current factory production — G&L isn’t manufacturing new PIC900 modules for this control generation. Confirm the specific condition grade with your quote.
Can I hot-swap this on a running CNC?
Don’t. Power down the affected rack section before removing or installing a ring module. SERCOS ring modules on legacy platforms like this aren’t designed for live insertion, and doing it risks damaging the ring interface on both the module and adjacent nodes.
Does replacing this module require reconfiguring the CNC’s servo parameters?
The module itself is a communication interface, not a parameter-storage device, so axis configuration data tied to the CNC controller should be unaffected. Still, verify ring communication and axis response after the swap before returning the machine to production.
What’s the warranty situation on a part like this?
Varies by seller — get the term in writing. On a legacy, low-volume part like this, “tested working” and “warrantied” are two different claims, and it’s worth knowing which one you’re actually getting before you commit.
