Plants still running vintage Modicon 984 controllers sometimes face a quiet problem: the I/O boards that have run reliably for decades are no longer stocked by no longer stocked by the manufacturer, and replacement parts have to be sourced from independent suppliers. The Schneider Electric / Gould Modicon AS-B061-P00 is one of those legacy rack-mount I/O PC boards. It belongs to the Modicon 984 family, plugs into a slot on the system backplane, and has been discontinued by the manufacturer. This guide covers what can be verified about the board, how it is used in a 984 rack, and how maintenance teams should approach spares procurement. SHLY-PLC supplies discontinued Modicon hardware as an independent industrial-automation distributor; every unit is inspected and bench-tested before dispatch.
What Is the AS-B061-P00?
The AS-B061-P00 is a printed-circuit I/O board from the Gould-Modicon lineage that Schneider Electric later inherited. It is a rack-mounted card intended for use in Modicon 984-series systems, the once-widely-used family of programmable controllers found in material handling, packaging, textile, and general manufacturing plants. Like other Modicon 984 I/O boards, it plugs directly into a slot on the passive backplane and communicates field signals to the 984 CPU over the system bus.
Because the board is decades old and manufacturer documentation is no longer readily distributed, the exact channel configuration (number of points, input versus output, and field voltage) should always be confirmed against the card's own nameplate, wiring diagram, or the original Modicon 984 I/O manual before a replacement is ordered. This guide states only the facts that are consistent across independent industrial-parts references.
Verified Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Schneider Electric (Gould Modicon heritage) |
| Product line | Modicon 984 |
| Product type | I/O board / printed-circuit assembly |
| Mounting | Rack / backplane slot mounting |
| Backplane | Modicon 984 28-slot rack |
| Country of manufacture | France |
| Approx. weight | 0.4 kg (about 1 lb) |
| Ambient operating temperature | 0 to 55 °C |
| Storage temperature | -25 to 55 °C |
| Transport temperature | -40 to 70 °C |
| Relative humidity | 5 to 95 %, non-condensing |
| Lifecycle status | Discontinued by manufacturer |
How It Fits in a Modicon 984 Rack
The Modicon 984 system is built around a passive backplane rack that supplies the I/O bus and rack power to each plugged-in module. The AS-B061-P00 occupies one slot in that rack and is addressed by its rack and slot position. Field wiring lands on the card's front terminal block or on an associated cable connector, depending on the revision and on the I/O type of the board. A CPU such as a 984 series processor scans the rack over the backplane and exchanges input and output data with the board as part of the normal I/O image.
When replacing a failed board, the practical steps are:
- Record the rack and slot number and label the field wiring before removal.
- Photograph or note the original terminal arrangement so the new card is wired identically.
- Verify the replacement board's revision and I/O type against the nameplate; the AS-B061-P00 appears with several variant suffixes in the trade.
- Power down the rack, exchange the card, and restore wiring following the original layout.
- Bring the rack back up and confirm the CPU recognizes the slot and the field I/O states match the process.
Compatibility and Wiring Notes
The board is designed for Modicon 984-series racks and CPUs. It is not a drop-in part for Modicon Quantum, Premium, Momentum, or M340 systems, which use different backplanes, form factors, and I/O architectures. Because the field-side rating of the board is not published in current manufacturer material, integrators should use the existing machine's wiring diagram and the card nameplate to confirm voltage, current, and whether the channels are inputs, outputs, or a combination. When in doubt, an experienced controls shop or an independent Modicon parts specialist can bench-test a unit before installation.
Typical Applications
- Material handling conveyors and transfer lines built on Modicon 984
- Packaging and bottling machinery with legacy Modicon racks
- Textile and printing machines controlled by 984-series CPUs
- Utility and water-pump skids still running on 984 platforms
- Spare-parts support for plants that have not yet migrated to a modern PLC
For these installed bases, keeping known-good replacement boards on hand is the most cost-effective way to avoid extended downtime. Related legacy controllers and I/O can be browsed in our Schneider / Modicon range and the PLC collection.
Lifecycle and Spare Parts
The AS-B061-P00 is discontinued by the manufacturer; new production no longer exists. Support for installed Modicon 984 systems now depends on the secondary industrial-parts market: tested surplus, exchanged, and remanufactured boards. Because exact I/O ratings vary by revision, procurement teams should treat the part number plus the board nameplate together as the purchase specification. SHLY-PLC holds a rotating stock of discontinued Modicon 984 hardware in our Discontinued Products range; if you have a failed card, send us the part number and a photo of the nameplate and we will confirm a matching replacement and its test status.
Frequently Asked Questions
What exactly does the AS-B061-P00 do?
It is a rack-mounted I/O printed-circuit board for Modicon 984-series systems, exchanging field signals with the 984 CPU over the backplane. The exact channel count and field voltage are not published in current manufacturer material and should be confirmed from the card nameplate or wiring diagram.
Which PLCs is the AS-B061-P00 compatible with?
It is designed for Modicon 984-series racks and processors. It is not a drop-in part for Modicon Quantum, Premium, Momentum, or M340 platforms, which use different backplanes and I/O architectures.
Is the AS-B061-P00 still made by Schneider?
No. The board is discontinued by the manufacturer. Available units are tested surplus, exchanged, or remanufactured cards supplied through independent industrial-parts distributors.
How should I buy a replacement AS-B061-P00?
Record the rack/slot position and photograph the nameplate and wiring before removal. Provide the part number and a photo to the supplier so the correct revision and I/O type can be matched, and confirm the unit has been bench-tested before dispatch.
SHLY-PLC is an independent distributor of industrial automation parts. All brand names, model numbers, and trademarks are the property of their respective holders and are used only for identification and compatibility reference.