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Home>SIEMENS>Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1 | S7-200 SMART ST20 / ST30 CPUs
Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1 | S7-200 SMART ST20 / ST30 CPUs

Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1 | S7-200 SMART ST20 / ST30 CPUs Item NO.: 2926359

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Product Name Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1 | S7-200 SMART ST20 / ST30 CPUs
Item NO. 2926359
Weight 0.1 kg = 0.2205 lb = 3.5274 oz
Category SIEMENS
Brand SIEMENS
Creation Time 2026-10-23

Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1 | S7-200 SMART ST20 / ST30 CPUs

Siemens · SIMATIC S7-200 SMART

Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1 | S7-200 SMART ST20 / ST30 CPUs

SECTION 01

Model Information

Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1 are SIMATIC S7-200 SMART DC/DC/DC CPUs with 24 V DC power, 24 V DC inputs and sourcing transistor outputs. ST20 integrates twelve inputs and eight outputs, while ST30 expands the base set to eighteen inputs and twelve outputs.

High-speed control is built into Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1 through six counters and three 100 kHz pulse outputs. The solid-state output stage supports rapid command changes, while ordinary point and common current limits still govern the connected DC loads.

A modular machine station can grow from Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1 through six expansion modules and one signal board. Both CPUs also separate Ethernet and RS485 communication, allowing the PROFINET path and a serial device network to be engineered independently.

SECTION 02

Technical Specifications

Technical dossier 6ES7288-1ST20-0AA1 6ES7288-1ST30-0AA1
Brand Siemens
Product Type CPU ST20 DC/DC/DC CPU ST30 DC/DC/DC
Brand Country Germany
Dimensions (W × H × D) 90 × 100 × 81 mm 110 × 100 × 81 mm
Weight 320 g 375 g
Power Dissipation 20 W 12 W
Program / Data / Retentive Memory 12 KB / 12 KB / 12 KB 18 KB / 16 KB / 12 KB
Integrated Digital I/O 12 inputs / 8 transistor outputs 18 inputs / 12 transistor outputs
Expansion Capacity 6 expansion modules; 1 signal board
5 V Expansion-Bus Supply 1,400 mA maximum
24 V Sensor Supply 300 mA maximum
PROFINET / Serial 1 × 10/100 Mbit/s; 1 × RS485
High-Speed Counters 6
Pulse Outputs 3 at 100 kHz
SECTION 03

Performance Characteristics

Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1 combine the CPU scan with hardware resources for fast counting and pulse-based commands.

Six counter channels›Three pulse outputs›Solid-state load response
01

Six counter channels

High-speed inputs capture configured pulse streams without relying only on the ordinary program scan.

02

Three pulse outputs

Up to three 100 kHz transistor channels can provide frequency or motion-related pulse trains within the supported functions.

03

Solid-state load response

Sourcing outputs avoid mechanical relay delay and are wired as polarized 24 V DC circuits.

SECTION 04

System Integration

Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1 share one expansion and communication structure but occupy different widths and terminal counts.

01

Twenty-point footprint

ST20 keeps the base CPU at 90 mm for compact machines that fit twelve inputs and eight outputs.

02

Thirty-point growth

ST30 extends the body to 110 mm and adds six inputs plus four outputs before any external module is installed.

03

Modular extension

Both CPUs support six right-side expansion modules and one signal board, subject to the available bus and field-power budgets.

SECTION 05

Common Product Questions

Why does a fast output remain inactive on Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1?

For Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1, confirm that the project assigns the required hardware pulse channel and that the load is wired as a 24 V DC sourcing circuit. A normal output coil in logic does not automatically configure the high-speed pulse function.

What should be recalculated when moving from Siemens 6ES7288-1ST20-0AA1 to 6ES7288-1ST30-0AA1?

Moving within Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1 changes memory, body width and integrated I/O addresses. Recheck terminal drawings, expansion-module start addresses and the enclosure layout before loading the revised project.

Why can an inductive DC load disturb Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1?

The transistor outputs of Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1 switch DC rapidly, so unsuppressed coil energy can create damaging voltage transients. Install suitable suppression at the load and keep point and common currents within their limits.

How are Ethernet and serial faults separated on Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1?

Check the PROFINET IP/device configuration and the RS485 address, protocol and baud rate as separate paths on Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1. A working Ethernet connection does not validate the serial network, and the reverse is also true.

Why does Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1 reset when several outputs switch together?

Measure the 24 V supply at Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1 during the switching event and include load inrush, sensor demand and module current. A nominal unloaded voltage can hide a supply or conductor drop under simultaneous load.

Can Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1 be replaced by an SR relay CPU without rewiring?

No direct equivalence should be assumed for Siemens 6ES7288-1ST20-0AA1 / 6ES7288-1ST30-0AA1 because ST outputs are sourcing transistors and SR outputs are relay contacts. Review supply type, polarity, commons, switching speed and every load circuit before changing CPU family.

SECTION 06

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SECTION 08

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