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SIEMENS SIMATIC S7-200 SMART 6ES7288-1ST20-0AA1 CPU ST20 DC/DC/DC | Original New

SIEMENS SIMATIC S7-200 SMART 6ES7288-1ST20-0AA1 CPU ST20 DC/DC/DC | Original New

SIEMENS · SIMATIC S7-200 SMART

6ES7288-1ST20-0AA1

CPU ST20 DC/DC/DC

ONBOARD I/O

12 DI

8 TRANSISTOR DO

20 KB memory

Supply: 20.4–28.8 V DC · Selection: verify full article number and firmware generation

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Appurtenance:

siemens s7 200 smart 6es7288 1st20 0aa1 cpu st20 dc dc dc-1

Overview
Applications
Technical Data
Interfaces
Environment
Installation
Verification
Availability
FAQ & Quote
Recommended Products

OFFICIAL PRODUCT OVERVIEW

Compact CPU for S7-200 SMART systems

The Siemens 6ES7288-1ST20-0AA1 is the SIMATIC S7-200 SMART CPU ST20 DC/DC/DC in DC/DC/DC configuration. Siemens specifies 12 onboard 24 V DC digital inputs, 8 transistor outputs rated up to 0.5 A, a 20.4–28.8 V DC supply range, and 20 KB of program/data memory. The 0AA1 generation is associated with firmware V2.7 or later and cannot be downgraded to earlier firmware generations.

12 DI
24 V DC

8 DO
Transistor, 0.5 A max.

20 KB
Program + data

Applications

CONTROL USE

Where the CPU fits

Compact machine control
Use the onboard digital I/O for local sensors, switches, contactors and fast-switching 24 V DC loads within the published ratings.

Networked automation
Integrate through the onboard Industrial Ethernet/PROFINET interface and RS485 port, subject to project topology and firmware support.

Confirm scan time, I/O count, protocol role and expansion requirements against the Siemens system manual before replacement or new design.

Technical Data

CORE SPECIFICATION

Technical data summary

Product type	CPU ST20 DC/DC/DC
Onboard I/O	12 DI, 24 V DC · 8 transistor DO, 0.5 A max.
Power supply	20.4–28.8 V DC
User memory	12 KB program + 8 KB data

Interfaces

COMMUNICATION

Ports and expansion

Industrial Ethernet
1 port, 10/100 Mbit/s, PROFINET functions depend on firmware and configuration.

RS485
1 interface, up to 187.5 kbit/s; protocol role must match the project.

Expansion / storage
EM bus support and optional microSDHC card; verify module count and current budget.

Environment

PROTECTION & COMPLIANCE

Cabinet environment

Compliance families	EMC, LVD and RoHS; UK equivalents are included in the Siemens declaration for this article number.
Mounting environment	Install inside a suitable control cabinet. Confirm temperature derating, spacing, ventilation and pollution conditions from the Siemens manual.
Electrical protection	Apply branch-circuit protection, grounding and load suppression according to the official wiring rules and local regulations.ba'y

Installation

BEFORE COMMISSIONING

Installation and selection

Mechanical
Standard DIN-rail mounting is supported. Check enclosure clearance, expansion-module position and service access before installation.

Electrical
Confirm DC supply range, transistor load category, common grouping, protective devices and wiring diagram before energizing.

Firmware note: the 0AA1 generation cannot be downgraded to firmware versions used by earlier 0AA0 models.

Verification

ORDER CHECK

Verify before purchase

Complete article number: 6ES7288-1ST20-0AA1	CPU type: ST20 DC/DC/DC
Onboard I/O: 12 DI and 8 relay DO	Supply and load ratings match the cabinet
Firmware generation and project compatibility	Current unit photos and nameplate available on request

Availability

COMMERCIAL CONFIRMATION

Availability and transaction details

Stock and condition	Subject to verification before quotation. New, used or refurbished status will be stated on the offer.
Photos and testing	Current unit and nameplate photos are available on request. Test scope is subject to verification.
Warranty and dispatch	Warranty term and dispatch date will be confirmed in the quotation.
Payment and response	Supported payment methods and quotation response time are available on request.
Transaction verification	Business registration, beneficiary details and transaction documents can be supplied for independent verification before payment.

FAQ & Quote

COMMON QUESTIONS

FAQ and request quote

Is this exact article number available?
Availability is confirmed before quotation. Send the complete model, required quantity and destination.

Can I receive current photos and a test statement?
Yes, both are available on request and remain subject to the quoted unit and agreed test scope.

What should be supplied for a compatibility check?
Provide the existing article number, firmware/project version, I/O list, supply voltage and network role.

MODEL DIRECTORY

Recommended Models

A selection of 50 frequently requested automation models. Confirm the complete article number and compatibility before quotation.

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