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PRODUCT DESCRIPTION
Twenty-four input signals with expandable ST40 DC control
Siemens 6ES7288-1ST40-0AA1 CPU ST40 provides twenty-four digital inputs and sixteen sourcing transistor outputs for DC-powered control. Its 24 KB program area is separate from variable memory; Siemens documents the latter by software generation, so memory comparisons require the applicable firmware context.
The standard ST40 architecture offers Ethernet, RS485 and modular expansion within a 125 mm-wide housing. Its 5 V expansion-bus resource is separate from the 24 V sensor supply; the documented capacities of six expansion modules and one signal board remain subject to the station power budget.
The standard ST40 architecture offers Ethernet, RS485 and modular expansion within a 125 mm-wide housing. Its 5 V expansion-bus resource is separate from the 24 V sensor supply; the documented capacities of six expansion modules and one signal board remain subject to the station power budget.
BEFORE YOU BUY
Confirm the complete installed configuration
ACTUAL APPLICATIONS
Industrial Production and Service Sectors
These industry examples describe Siemens' broader market coverage, not verified installations of this exact product. Product suitability depends on the documented configuration and engineering requirements.
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01 · PACKAGING
Food and Beverage Packaging
Food product packaging across the commercial food manufacturing sector.Beverage packaging for finished products in the drinks industry. -
02 · PLASTICS PROCESSING
Extrusion and Injection Molding
Plastic extrusion for material production within the plastics industry.Injection molding for plastic product manufacturing across industrial markets. -
03 · METAL FORMING
Sheet Metal and Wire Processing
Sheet metal processing within the broader metal forming industry.Wire processing for metal products across industrial manufacturing sectors.
Technical specifications for 6ES7288-1ST40-0AA1
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Product Model6ES7288-1ST40-0AA1
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Spare Model6ES7288-1ST40-0AA1
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Product ParametersCPU ST40 Transistor Controller
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In stock1 unit
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ManufacturerSiemens
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CPU supply range20.4 to 28.8 V DC
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Onboard digital inputs24, nominal 24 V DC
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Onboard digital outputs16
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Output technologySourcing MOSFET transistor
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Program memory24 KB
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Ethernet interface1, 10/100 Mbit/s
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Serial interface1 x RS485
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Expansion modules6 maximum
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Signal-board expansion1 maximum
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Sensor-power output24 V DC, 300 mA maximum
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Output current per point0.5 A maximum; observe common-group and load-type limits
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Expansion-bus supply5 V DC, 1400 mA maximum
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Pulse outputs3 designated channels, up to 100 kHz
View all additional
Alternative Names
6ES72881ST400AA1
6ES7 288-1ST40-0AA1
SIMATIC S7-200 SMART CPU ST40
CPU ST40 DC/DC/DC
SYSTEM & REPLACEMENT CHECK
Information needed before ordering
Three direct checks to secure your system integration and minimize ordering risks.
Information
System integration
Replacement check
Manuals & support
S7-200 SMART ARCHITECTURE
Twenty-four input signals with expandable ST40 DC control
The ST40 balances twenty-four local inputs with sixteen transistor output points. Three pulse-output resources are documented separately from ordinary switching channels, so the configured fast functions and the electrical load assignments form part of the controller specification. Its program capacity is 24 KB.
Standard expansion permits six modules and one signal board. The 1.4 A maximum expansion-bus supply and 300 mA sensor-power output are distinct limits, and neither should be confused with the current rating of an individual transistor output. Each transistor point is rated at 0.5 A maximum.
One Ethernet interface and one RS485 port serve different communication partners in the configured project. Siemens documents PROFINET controller and I-Device roles for the standard ST40. The available network resources, serial settings and optional communication signal board must be reconciled with the installed firmware and the intended station configuration.
Features:
- 24/16 onboard digital I/O
- Ethernet plus serial access
- Expandable standard CPU
The Siemens 6ES7288-1ST40-0AA1 requires the documented hardware configuration, installation conditions and interface arrangement to be verified before system integration and commissioning.
INTERCHANGEABILITY
Verify the complete replacement identity before commissioning
Identify the full 6ES7288-1ST40-0AA1 code and its installed firmware before comparing memory requirements. Siemens documents a 4 KB variable-memory increase and 2 KB additional retentive range for V2.8. That release also prohibits downgrading a V2.8 CPU to V2.7 or earlier, making the project version an essential replacement check.
Preserve the twenty-four input and sixteen output assignments with the saved project. The ST40 transistor commons differ from the relay arrangements shown beside it in Siemens tables. Check the exact ST40 terminal diagram and group ratings before transfer; similar housing and point totals do not establish interchangeability.
Review the sourcing-output loads, their commons and the 24 V supply budget against the drawings. The optional memory card and signal board are configuration items, not evidence that either accessory is included with the offered replacement. The output table lists no overload protection.
Features:
- Complete suffix verification
- Project and firmware comparison
- Electrical configuration review
The Siemens 6ES7288-1ST40-0AA1 requires replacement verification based on its complete order number, installed hardware, signal configuration and project documentation.
DOCUMENTATION STATUS
Browse the Manuals, Datasheets, Official Documents, Links
Important Notice: Official documents are provided through manufacturer links. Accessories, manuals, cables, calibration data, software, certificates, and other items are not included with this equipment unless listed in the stock item description.
Features:
- Exact-model manufacturer data and relevant original manual pages
- Verified manufacturer product reference; separate installation document not supplied
- Accessories and supplied documentation follow the written quotation
Documentation for the Siemens 6ES7288-1ST40-0AA1 includes an independent technical summary and selected original manufacturer pages; check the applicable document edition against the delivered product and approved installation documentation.
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Important notice
Manuals, software, firmware, cables, calibration data and accessories are included only when listed in the quotation. AMIKON is an independent supplier and is not affiliated with or authorised by the manufacturer.
This content has been produced using multiple sources. Takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
BUYER INFORMATION
Commercial terms without hidden steps
Your written quote confirms the product identity, price, availability, lead time, warranty and shipping terms before payment.
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01
Shipping & delivery
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DispatchEligible stock: same / next day
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CarriersDHL, FedEx or UPS
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Ship fromXiamen, China
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Packed sizeConfirm final packed dimensions
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Shipping weightConfirm final packed weight
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Payment & customs
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PaymentBank transfer (T/T)
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CurrenciesUSD · EUR · GBP · RMB
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Credit cardsNot accepted
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HS reference8537101190
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OriginConfirm supplied-unit origin
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Warranty & returns
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Warranty12 months from AMIKON
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InspectionLabel, condition and packing checks
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ReturnsPrior RMA authorisation required
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CompatibilityConfirm before order
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OEM warrantyDoes not apply
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Your written quote confirms the product identity, price, availability, lead time, warranty and shipping terms before payment.
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Part checked
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Condition checked
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Sandy Lin
Dedicated account manager · 15+ years
FREQUENTLY ASKED QUESTIONS
Questions buyers ask about 6ES7288-1ST40-0AA1
Direct answers about identity, compatibility, stock, warranty, payment and shipping.
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Does the forty-point ST40 use DC or relay outputs?
This exact model is DC/DC/DC: twenty-four inputs and sixteen sourcing transistor outputs. Each output has a 0.5 A maximum point rating; it is not the SR40 relay arrangement. -
How many of the sixteen outputs have documented pulse capability?
Three designated pulse-output resources are listed at up to 100 kHz. The pulse limit is separate from ordinary output loading and should not be applied indiscriminately to every channel. -
Why do older and V2.8 documents show different user-data figures?
The 2022 exact-model sheet lists 16 KB user data. Siemens describes a 4 KB variable-memory increase with V2.8, whose table lists 20 KB; verify the installed firmware instead of combining figures from different releases. -
Can a CPU supplied with V2.8 be downgraded to V2.7?
No. Siemens' V2.8 release notes explicitly prohibit downgrade to V2.7 or earlier. The replacement decision must include the project's supported engineering environment. -
What is the distinction between expansion and sensor-power limits?
The 5 V expansion-bus resource is limited to 1.4 A and sensor power to 300 mA. These separate budgets do not replace the transistor-output point and common-group load limits. -
Does standard expansion mean the optional accessories are included?
No inclusion is established by the technical specification. The CPU supports six expansion modules, one signal board and an optional microSDHC card, but the supplied items require order confirmation.
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