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Siemens SIMATIC S7-400 · Digital Input Module

Siemens 6ES7421-1BL01-0AA0

ECS rates the 6ES7421-1BL01-0AA0 as phase-out: still orderable, but on its way out. This is the time to plan, not panic.

  1. Active RolloutSold and supported normally
  2. Phase OutRetirement announced, still orderable
  3. CancellationNormal sale ended, spares may remain
  4. Total DiscontinuationNo manufacturer supply or repair

ECS stage: Phase Out.

Is the Siemens 6ES7421-1BL01-0AA0 being discontinued?

On ECS's lifecycle assessment, the 6ES7421-1BL01-0AA0 is in phase-out: still orderable for now, but on its way out.

Source: ECS lifecycle assessment, based on ECS's internal lifecycle data in Command Centre. Last checked . Always confirm a specific part's status with the manufacturer before buying or planning a migration.

What Phase Out means for you

The manufacturer is retiring the part, but you can still buy it. Nothing needs ripping out. Four things are worth doing while it is still easy: find every unit you run, make sure you know where each one is, decide whether to hold spares, and price the move.

How ECS defines Phase Out · all four lifecycle stages

Before replacing an input module

For an input module we would record the field voltage, sink/source arrangement, commons, channel allocation and PLC addresses before considering an alternative.

Modern I/O can accept the same nominal signals but use different terminal layouts, isolation groups or addressing, which means a small module change can create wiring and software work. Photographing the terminations and exporting the I/O configuration now can save a lot of diagnosis during a breakdown.

ECS engineering guidance

6ES7421-1BL01-0AA0 part details

Manufacturer
Siemens
Range
SIMATIC S7-400
Name
S7-400, Digital input, 32 DI x 24VDC
Summary
SIMATIC S7-400, digital input SM 421, isolated 32 DI; 24 V DC

Common questions about the 6ES7421-1BL01-0AA0

Is the Siemens 6ES7421-1BL01-0AA0 being discontinued?

On ECS's lifecycle assessment, the 6ES7421-1BL01-0AA0 is in phase-out: still orderable for now, but on its way out.

Can I still buy a 6ES7421-1BL01-0AA0?

Yes, through normal channels during the phase-out period. It is the cheapest point to buy any spares you want to hold.

An ECS engineer capturing a control panel on a tablet: PLC, drive and power supply identified and synced to Command Centre

Know where every unit is before one fails.

A Capture audit finds every 6ES7421-1BL01-0AA0 on your site, photographs it where it sits and checks it against manufacturer lifecycle status, so you know your exposure and where your spares are before a failure stops a line.

  • Every device located, photographed and lifecycle-checked
  • Findings report, plus a populated Command Centre
  • No production downtime
See how Capture works

Other SIMATIC S7-400 parts

All Siemens parts · All manufacturers