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Siemens S7-300 Discontinued Parts: 2026 Lifecycle Database

By Roe Mcklavin

S7-300 Lifecycle Database

Every order number we have checked

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Every SIMATIC S7-300 order number we have researched, with its Siemens lifecycle status, the date it was checked and the successor Siemens names.

The S7-300 lifecycle at a glance

Siemens announced the phase-out on 1 October 2023 (PM400) and discontinued the system on 1 October 2025 (PM410). Since then modules are supplied only as spare parts, in spare-part quantities.

Siemens plans spare-part availability for the S7-300 / ET 200M family until 1 October 2033, and notes that single components can have earlier dates. Source: Siemens entry 109824203, section 1.1.

For a plant running S7-300 that leaves two routes: keep the system going with spare modules, or plan a migration. Spares are the practical answer for a breakdown or a machine with years left in it; migration is a project, because it means converting the hardware configuration and the program.

What Siemens names as the successor

Siemens names the S7-1500 system with ET 200MP I/O as the functional replacement for factory automation, and S7-400 or ET 200SP HA for process automation. It is a migration of hardware and program, not a module swap.

Source: Siemens Industry Online Support · Siemens S7-1500 parts in our catalogue

S7-300 order numbers and their status

Each status is taken from the part’s own Siemens product page on the date shown. Siemens can change a status, so the source link is the reference.

CPU and processor modules

Order numberDescriptionStatusCheckedSource
6ES7312-1AE14-0AB0CPU 312, 32 KB, MPIDiscontinued2026-09-29Siemens
6ES7312-5BF04-0AB0CPU 312C compact, 64 KB, 10 DI/6 DO, MPIDiscontinued2026-09-30Siemens
6ES7313-5BG04-0AB0CPU 313C compact CPU with integrated I/O, MPIDiscontinued2026-09-29Siemens
6ES7313-6CG04-0AB0CPU 313C-2 DP compact CPU, 16 DI/16 DO, MPI and PROFIBUS DPDiscontinued2026-09-30Siemens
6ES7314-1AG14-0AB0CPU 314, 128 KB, MPIDiscontinued2026-09-30Siemens
6ES7314-6CH04-0AB0CPU 314C-2 DP compact CPU with integrated I/O, MPI and PROFIBUS DPDiscontinued2026-09-30Siemens
6ES7314-6EH04-0AB0CPU 314C-2 PN/DP compact CPU with integrated I/ODiscontinued2026-09-29Siemens
6ES7315-2AH14-0AB0CPU 315-2 DP, 256 KB, MPI and PROFIBUS DPDiscontinued2026-09-29Siemens
6ES7315-2EH14-0AB0CPU 315-2 PN/DP, 384 KB, MPI/DP and PROFINETDiscontinued2026-09-29Siemens
6ES7317-2AK14-0AB0CPU 317-2 DP, 1 MB, MPI/DP and PROFIBUS DPDiscontinued2026-09-30Siemens
6ES7317-2EK14-0AB0CPU 317-2 PN/DP, 1 MB, MPI/DP and PROFINETDiscontinued2026-09-29Siemens
6ES7318-3EL01-0AB0CPU 319-3 PN/DP, 2 MB, MPI/DP, DP and PROFINETDiscontinued2026-09-30Siemens

Digital input and output modules

Order numberDescriptionStatusCheckedSource
6ES7321-1BH02-0AA0SM 321 digital input, 16 DI, 24 V DCDiscontinued2026-09-29Siemens
6ES7321-1BL00-0AA0SM 321 digital input, 32 DI, 24 V DCDiscontinued2026-09-29Siemens
6ES7321-1FH00-0AA0SM 321 digital input, 16 DI, 120/230 V ACDiscontinued2026-09-30Siemens
6ES7322-1BH01-0AA0SM 322 digital output, 16 DO, 24 V DC, 0.5 ADiscontinued2026-09-29Siemens
6ES7322-1BL00-0AA0SM 322 digital output, 32 DO, 24 V DC, 0.5 ADiscontinued2026-09-29Siemens
6ES7322-1FH00-0AA0SM 322 digital output, 16 DO, 120/230 V AC, 1 ADiscontinued2026-09-30Siemens
6ES7322-1HF01-0AA0SM 322 relay output, 8 DO, relay contactsDiscontinued2026-09-30Siemens
6ES7322-1HH01-0AA0SM 322 relay output, 16 DO, relay contactsDiscontinued2026-09-29Siemens
6ES7323-1BL00-0AA0SM 323 digital I/O, 16 DI and 16 DO, 24 V DCDiscontinued2026-09-29Siemens

Analogue input and output modules

Order numberDescriptionStatusCheckedSource
6ES7331-1KF02-0AB0SM 331 analog input, 8 AI, 13 bit, U/I/resistance/Pt100/NiDiscontinued2026-09-30Siemens
6ES7331-7KB02-0AB0SM 331 analog input, 2 AI, U/I/thermocouple/resistanceDiscontinued2026-09-30Siemens
6ES7331-7KF02-0AB0SM 331 analog input, 8 AI, U/I/thermocouple/resistanceDiscontinued2026-09-29Siemens
6ES7331-7NF00-0AB0SM 331 analog input, 8 AI, 16 bit, U/IDiscontinued2026-09-30Siemens
6ES7331-7PF01-0AB0SM 331 analog input, 8 AI, RTD, 16 bitDiscontinued2026-09-30Siemens
6ES7332-5HD01-0AB0SM 332 analog output, 4 AO, voltage/currentDiscontinued2026-09-30Siemens
6ES7332-5HF00-0AB0SM 332 analog output, 8 AO, voltage/currentDiscontinued2026-09-29Siemens
6ES7334-0KE00-0AB0SM 334 analog module, 4 AI / 2 AO, 12 bitDiscontinued2026-09-30Siemens

Safety PLCs and safety I/O

Order numberDescriptionStatusCheckedSource
6ES7315-2FJ14-0AB0CPU 315F-2 PN/DP fail-safe, 512 KB, MPI/DP and PROFINETDiscontinued2026-09-30Siemens
6ES7315-6FF04-0AB0CPU 315F-2 DP fail-safe, 384 KB, MPI and DPDiscontinued2026-09-30Siemens
6ES7317-2FK14-0AB0CPU 317F-2 PN/DP fail-safe, 1.5 MB, MPI/DP and PROFINETDiscontinued2026-09-30Siemens
6ES7317-6FF04-0AB0CPU 317F-2 DP fail-safe, 1.5 MB, MPI/DP and DPDiscontinued2026-09-30Siemens

Communication processors

Order numberDescriptionStatusCheckedSource
6ES7340-1AH02-0AE0CP 340 communications processor, RS 232CDiscontinued2026-09-30Siemens
6GK7342-5DA03-0XE0CP 342-5 communications processor, PROFIBUS DP master/slaveDiscontinued2026-09-29Siemens
6GK7343-1CX10-0XE0CP 343-1 Lean communications processor, Industrial EthernetDiscontinued2026-09-29Siemens
6GK7343-1EX30-0XE0CP 343-1 communications processor, Industrial Ethernet, PROFINET IO controllerDiscontinued2026-09-29Siemens

Interface and relay cards

Order numberDescriptionStatusCheckedSource
6ES7392-1AJ00-0AA0Front connector, 20-pole, screw terminalsDiscontinued2026-09-29Siemens
6ES7392-1AM00-0AA0Front connector, 40-pole, screw terminalsDiscontinued2026-09-29Siemens

Memory and backup modules

Order numberDescriptionStatusCheckedSource
6ES7953-8LJ31-0AA0Micro Memory Card 512 KB for S7-300Phased out2026-09-29Siemens
6ES7953-8LL31-0AA0Micro Memory Card 2 MB for S7-300Phased out2026-09-29Siemens

Rack power supplies

Order numberDescriptionStatusCheckedSource
6ES7307-1EA01-0AA0PS307 power supply, 120/230 V AC in, 24 V DC 5 A outPhased out2026-09-29Siemens

Counter, positioning and temperature modules

Order numberDescriptionStatusCheckedSource
6ES7350-1AH03-0AE0FM 350-1 counter module, 1 channel, up to 500 kHzDiscontinued2026-09-30Siemens

Earlier order numbers

Older versions with no page of their own, and the number Siemens moved to.

  • 6ES7315-2AG10-0AB0 CPU 315-2 DP (earlier version): Discontinued. Siemens successor: 6ES7315-2AH14-0AB0

Buying S7-300 spares

Quote the full order number, including the version digits, and the firmware version on the label. Current S7-300 CPUs need a SIMATIC Micro Memory Card, which is ordered separately, so keep the card or a backup of the program. Before you order, work through the S7-300 replacement buying checklist. Other PLC parts are on the PLCs & processors page.

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