Standing Requests for Discontinued Automation Parts: What Ha

Standing Requests for Discontinued Automation Parts: What Happens When the Line Stays Open and the Stock Is Zero

A machine-down call opens the same way too often: the part on the drawing has been out of production for years, the franchised channel returns "no longer available" or a 52-week allocation horizon, the customer has been told to redesign the line, and the line cannot wait for a redesign. The buyer asks the only honest follow-on. Either you have it, you can find it, or you can put it on a list and tell me when something turns up. That second option — the open line — is what this article is about.

We are an independent industrial automation distributor and sourcing desk based in China, shipping to Moscow, the Russian regions, Belarus and Kazakhstan under EXW, FCA, DAP or DDP as the quotation states. We are not an authorized distributor of any brand on our catalogue, we do not hold manufacturer-issued warranty, and we do not have special procurement channels that bypass the open market. Standing requests are still useful, but only because the supply of obsolete and allocation-constrained parts is more like a moving inventory than a fixed shelf. Stock that was unavailable last month can reappear at a different supplier next month. We do not control that flow; we watch it and report it.

What a standing request actually is, and is not

A standing request is a line we keep open against your part number, your quantity, and your target condition (new surplus, refurbished, or used, or any combination you permit). It is not a reservation. It is not an order. It is not a promise that we will find the part, and it is not a promise of a price.

Two things have to be said plainly so the rest of this article is on solid ground:

Stock of discontinued automation parts is not held on our shelf. It is held across the open market in China — at surplus dealers, at panel scrappers, at the secondary inventories of brands that have wound down a line. We draw on that market when an order is firm, not before.
Prices, conditions and availability for any line we have not yet sourced for you are re-checked at the moment we have a candidate, not at the moment you placed the standing request. A quote from January is not a quote from September. The buyer's question is «Где найти запчасть, которую сняли с производства?» — that is the right question, and it has the right answer: a standing request is one of three honest ways to look.

The other two honest ways are an immediate quote attempt (we look now, on the day, against the open market) and a last-time-buy route when the manufacturer still has a window. A standing request sits between them: it acknowledges that the part is not findable today on terms you can accept, and it keeps the line open until something turns up that does meet them.

How an open line works in practice

Operationally, a standing request looks like this from your side and ours. You send the part number, the quantity, the acceptable conditions, and any constraints we should know about — a firmware version, a hardware revision, a cabinet that cannot be reworked, a project deadline that has shifted. We open a line against that description. There is no fee for opening the line and no fee for keeping it open. We do not invoice standing-request management as a separate service.

When a candidate appears, we send you the line in the same format we use for any other quotation: one line, one part number, one price indication, one MOQ, one lead time indication, and one condition (new surplus, refurbished, or used — never blended across the lot). At that point you decide whether to firm the order, hold the line open for more candidates, or close the line because what turned up does not match. We do not move from candidate to order without your confirmation, and we do not charge a deposit against a candidate you have not accepted.

Two operational details matter for buyers who are running this across multiple parts at once.

First, lines are kept per part number, not per order. A 40-line BOM that has ten discontinued lines turns into ten open lines, each with its own recheck cadence, and the rest of the order ships when those lines are firm or when you say to ship what is firm and leave the rest open. This is the same per-line discipline we apply to an immediate quote: every line carries its own price, MOQ, lead time and condition, and you can drop or defer individual lines rather than rejecting the whole package.

Second, lines do not age out by themselves. If you no longer want the part — the machine was retired, the project changed, the engineering team found a different path — you close the line and we close ours. We do not generate automatic reminder pings to keep a line alive, because a line that is being chased for the sake of being chased is not useful to either side.

What a standing request does not do

Three limits are worth saying out loud, because they are the ones that turn a useful tool into a source of friction.

No fixed timeline. A standing request is not a forecast. We do not commit to a window in which the part will appear, and we do not promise that it will appear at all. The open market for discontinued Siemens S7-300 CPUs, Omron E3ZM photoelectric sensors, Phoenix Contact Axioline modules, Mitsubishi FX3 series PLCs, Schneider TeSys D contactors and similar families behaves like a long-tail inventory: most of the volume is concentrated in a small number of part numbers and the long tail moves slowly. A part that is genuinely scarce can stay scarce for years; a part that is allocation-constrained on the franchised channel can reappear on the open market in weeks when an integrator scraps a line. We report what the market shows; we do not invent windows.

No price hold. Indicative prices for a part you have not yet bought are re-confirmed when a candidate surfaces. They are not held from the day you placed the standing request. If you need a budget number today for a project that will not order for six months, the right answer is to ask us for a current indicative price range, not to assume that any figure you heard six months ago still holds.

No special procurement channel. We do not have a back door into the franchised channel, we do not have an inside line at any manufacturer, and we do not buy from sources we cannot describe. The candidates that turn up on a standing request come from the same open market that an immediate quote draws on — surplus dealers, panel scrappers, decommissioned production lines, secondary inventories. The only thing that changes between an immediate quote and a standing request is the time window, not the source.

When a standing request is the wrong tool

Three situations call for a different instrument.

The machine is down and you need the part in days, not in months. An open line is the wrong shape for an urgent need because there is no guarantee anything will turn up before the line stops. For a machine-down urgent need, the right shape is an immediate quote attempt across the open market plus, where the manufacturer still has one, a last-time-buy window. We tell you on the day what is actually obtainable rather than holding the request open for a week.

You need a part with manufacturer warranty and a paper trail. A standing request for a discontinued line will not produce manufacturer warranty because the manufacturer is no longer making the line. If your application requires manufacturer warranty — a regulated production run, a safety-rated new design, a quality system that will not accept third-party documentation — a standing request is the wrong tool and so is an immediate quote from an independent desk. The right path there is a redesign, a different manufacturer, or a quality-system decision that you own.

You want us to swap in a different part without engineering review. A standing request is for finding the specific part you asked for, not for sourcing "something like it." Where a documented side-by-side specification comparison exists, we can produce one as a separate written report with the twelve axes of comparison (matched / differs / unknown). Where no documented comparison exists, we do not invent one. Swapping in a look-alike without engineering review is the line we will not cross, on a standing request or anywhere else.

Catalog entries that anchor this

Two Siemens SIMATIC entries from our catalogue are the kind of part that prompts a standing request from a buyer who has been told the line is gone but who knows the part has a long service life in installed machines.

Siemens 6ES7212-1AE40-0XB0 (SIMATIC S7-1200, CPU 1212C DC/DC/DC, programme / data memory 75 KB, 8 DI 24 V DC / 6 DO 24 V DC / 2 AI 0-10 V DC, integrated PROFINET interface). Catalogue score 95 — high-demand SKU.
Siemens 6ES7211-1AE40-0XB0 (SIMATIC S7-1200, CPU 1211C DC/DC/DC, programme / data memory 50 KB, 6 DI 24 V DC / 4 DO 24 V DC / 2 AI 0-10 V DC, integrated PROFINET interface). Catalogue score 90 — high-demand SKU.

These two CPUs sit at the heart of a large installed base of S7-1200 machines, and even though the S7-1200 platform itself is not discontinued, individual hardware revisions of these CPUs have moved through lifecycle stages where the open market has become a meaningful route for buyers whose machine needs the specific revision rather than the current one. A standing request on a specific revision is the case we see most often; an immediate quote across the open market is the case we see second most often; a last-time-buy window is the case we see least often because the manufacturer is unlikely to retire a high-volume SKU overnight.

The same pattern shows up across other families — Omron E3ZM photoelectric sensors, Phoenix Contact Axioline F I/O, Mitsubishi FX3 series PLCs, Schneider TeSys D contactors. The brand and series differ; the shape of the standing request is the same: a specific part on a specific machine that the open market has to provide because the franchised channel no longer does.

What changes when the line is open

Three things shift when a line moves from a one-day quote attempt to a standing request, and they all matter for the buyer's calendar.

The price ladder. On an immediate quote, you see what is obtainable today and you decide. On a standing request, you may see a candidate three months from now at a different number — sometimes lower, because a lot of surplus came off a decommissioned line, sometimes higher, because the candidates that do appear are scarcer than the ones that appeared earlier. The right framing for a budget conversation is to treat the indicative range as the spread we have actually seen on the part over the last six to twelve months, not a single number.

The condition ladder. Candidates that turn up after a part has been unavailable for a while skew more towards used or refurb, and away from new surplus. A line that has been open for a year will mostly meet used or refurbished units, and a small number of new-surplus units when a decommissioned production line is scrapped. If your application requires new surplus, a standing request has a lower hit rate than an immediate quote; if your application accepts used or refurbished with a per-line test record, the hit rate is higher.

The verification ladder. Every candidate we surface on a standing request goes through the same per-line check we apply to an immediate quote: marking on the unit, supplier documentation, photograph before dispatch, and the stated condition on the line. The longer a line has been open, the more important this ladder is, because the candidates that turn up late are usually farther from the original channel than the ones that appeared early.

How this fits an industrial plant's actual constraints

The standing-request instrument comes up most often inside three industrial plant environments: a bottling or packaging line that cannot lose a station, a pumping or ventilation panel in a water utility, and a discrete-assembly cell on a press line where the cabinet is sealed and the spare-parts list has not been touched in fifteen years. Each environment has its own constraints and the open market behaves differently in each.

A bottling line running on a SIMATIC S7-1200 station usually sees cabinet interior temperatures in the 0 to 50 °C operating range, IP 20 ingress on the module front, supply voltage 24 V DC on the inputs, vibration well below what a press line would see, and EMC class A inside a metal cabinet. The relevant axis for a standing request on a CPU like the 6ES7212-1AE40-0XB0 is not whether the part physically fits the slot — it does, the mounting and pinout are unchanged — but whether the firmware revision on the candidate matches what the existing project expects.

A pumping or ventilation panel running on a Phoenix Contact Axioline F I/O station sees wider temperature swings, IP 20 again, more variation in supply quality, and a higher share of the cabinet dedicated to motor-contactors and overload relays. A standing request here usually waits longer because the part numbers are family-specific and the volumes are lower than the high-volume SIMATIC or Omron SKUs.

The honest scope of an open line

A standing request is one of three tools a buyer has when a part is discontinued, and it is the right tool when the part is genuinely scarce, the buyer can wait, and the buyer accepts that the part may not appear at all. It is the wrong tool when the buyer cannot wait, when the application requires manufacturer warranty, or when the buyer wants a look-alike rather than the specific part.

What we will always tell you on a standing request, and what we will never tell you:

We will tell you when a candidate appears, in the same line-item format as any other quotation, with price indication, MOQ, lead time indication and condition per line.
We will tell you if a line has been open long enough that the realistic candidates are used or refurbished rather than new surplus.
We will tell you when we have looked and have nothing to report.
We will not promise a window in which the part will appear.
We will not hold a price from the day the line was opened.
We will not invent a look-alike and call it the part you asked for.

We screen end users and end uses, classify before quoting, and decline transactions that cannot be screened. Lines that fall inside end uses we do not serve — military, two-use, implant-class medical — are declined at the opening, not after a candidate has turned up.

If you have a BOM rather than a single part, share your BOM in any format (Excel, PDF, a photo of a handwritten sheet, or an ERP export) and we open a standing request per discontinued line alongside an immediate quote on the lines that are still in production. Many standing requests start as one line inside a larger BOM where the other lines are firm orders; the same per-line discipline applies either way.

Data Notes

Catalog grounding comes from our own listing records (aoctrl.com) — Siemens 6ES7212-1AE40-0XB0 (score 95) and Siemens 6ES7211-1AE40-0XB0 (score 90). Service-process references come from our published policy pages — /procurement, /quality, /about, /shipping-returns, /terms-of-sale — and from the O01/O02/O03/O04/O05 entries of our sourcing FAQ. No external news source is cited in the body of this article because the subject — how a standing request to an independent desk actually works — is a service-process question rather than a market-news question.

Sending the first message

If you have a part on a standing request today, send us your BOM or part number with the quantity, the acceptable conditions, and any constraint that matters to your engineering team. If you have more than one part, share your BOM as a list rather than as separate messages; we open lines per part, and a list lets us show you the per-line picture from the start. If the part is identified only from a marking and a photograph, send what is legible on the label, the housing and the PCB, plus the machine it came from and, if you have it, the machine's manual or spare-parts list. Contact our sourcing desk through /inquiry when you are ready to open the line, and we open it the same working day.

FAQ

What is a standing request, in one sentence?

A line we keep open against your specific part number, quantity and acceptable condition, until a candidate turns up on the open market that matches — not a reservation, not an order, not a promise.

How long will you keep a standing request open?

As long as you want the part. There is no fee for opening or keeping the line open, and we do not auto-close on a timer. You close the line when you no longer need the part; we close ours at the same time.

Will the price I was quoted at the start still hold?

No. Indicative prices for a part you have not yet bought are re-checked at the moment we have a candidate. The right budget framing is the spread we have actually seen on the part over the last six to twelve months, not a single number from the day the line was opened.

What if a used or refurbished unit is the only candidate that turns up?

That is the most common outcome for lines that have been open for a year or more. We state the condition on the line, we send the per-line test record that the supplier provides, and we send a photograph before dispatch. You accept or decline the candidate as you would any other line.

Can you keep the line open while a redesign is in progress, so I have a fallback?

Yes. A standing request runs in parallel with whatever engineering path you are pursuing. If the redesign ships, you close the line. If the redesign slips and the open market produces a candidate, you have the option to firm the order.

Do you charge a fee for opening or maintaining a standing request?

No. The line is opened and maintained at no charge. We invoice only when a candidate is accepted and an order is firm.

What if you cannot find the part at all?

We tell you the line has produced no candidates over the period it has been open, and we close the line if you no longer want it kept open. We do not invent a look-alike and call it the part you asked for.

Is a standing request the right tool for an urgent machine-down need?

No. For a machine-down need, the right tool is an immediate quote attempt against the open market plus, where the manufacturer still has one, a last-time-buy window. A standing request is for the case where you can wait and the part is genuinely scarce.

Independent industrial automation distributor and sourcing desk based in China. By aoctrl sourcing desk. Not an authorized distributor of any brand on the catalogue. We do not hold EAC or TR CU certification, do not provide manufacturer warranty, and do not perform functional-safety or medical-compliance qualification. Sourcing is per-line, with condition, price, MOQ and lead time stated on every line. We screen end users and end uses, classify before quoting, and decline transactions that cannot be screened. Data through: September 2026.