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Home>SIEMENS>Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1 | S7-200 SMART ST40 / ST60 CPUs
Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1 | S7-200 SMART ST40 / ST60 CPUs

Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1 | S7-200 SMART ST40 / ST60 CPUs Item NO.: 2926362

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Product Name Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1 | S7-200 SMART ST40 / ST60 CPUs
Item NO. 2926362
Weight 0.1 kg = 0.2205 lb = 3.5274 oz
Category SIEMENS
Brand SIEMENS
Creation Time 2026-10-23

Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1 | S7-200 SMART ST40 / ST60 CPUs

Siemens · SIMATIC S7-200 SMART

Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1 | S7-200 SMART ST40 / ST60 CPUs

SECTION 01

Product Overview

Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1 are high-point-count SIMATIC S7-200 SMART DC/DC/DC CPUs. ST40 integrates twenty-four inputs and sixteen transistor outputs; ST60 extends the base controller to thirty-six inputs and twenty-four transistor outputs.

Program capacity grows with the physical I/O on Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1. ST40 provides 24 KB program and 20 KB data memory, while ST60 provides 30 KB program and 24 KB data memory; both retain up to 12 KB of configured retentive data.

Machine communication and expansion remain consistent across Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1: one PROFINET port, one RS485 port, six expansion modules and one signal board. Their six high-speed counters and three 100 kHz pulse outputs keep fast signals inside the CPU while slower field I/O can be distributed across the module chain.

SECTION 02

Product Data

Technical dossier 6ES7288-1ST40-0AA1 6ES7288-1ST60-0AA1
Brand Siemens
Product Type CPU ST40 DC/DC/DC CPU ST60 DC/DC/DC
Brand Country Germany
Dimensions (W × H × D) 125 × 100 × 81 mm 175 × 100 × 81 mm
Weight 410.3 g 528.2 g
Power Dissipation 18 W 20 W
Program / Data / Retentive Memory 24 KB / 20 KB / 12 KB 30 KB / 24 KB / 12 KB
Integrated Digital I/O 24 inputs / 16 transistor outputs 36 inputs / 24 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

Operating Characteristics

Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1 provide two levels of high-density local control without changing the S7-200 SMART programming family.

Forty-point controller›Sixty-point controller›Memory matched to scale
01

Forty-point controller

ST40 combines twenty-four inputs and sixteen outputs with a 125 mm body for medium local I/O density.

02

Sixty-point controller

ST60 places thirty-six inputs and twenty-four outputs in a 175 mm body for the largest integrated ST point set.

03

Memory matched to scale

The larger ST60 adds program and data space so the expanded terminal set is not paired with the smaller ST40 memory allocation.

SECTION 04

Monitoring and Control

Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1 use dedicated high-speed hardware to separate pulse work from ordinary cyclic I/O.

01

Three 100 kHz channels

Configured transistor outputs can produce three pulse streams for supported high-speed command functions.

02

Six counter inputs

High-speed counters collect fast external events using the supported single-phase or A/B-phase arrangements.

03

Program coordination

The CPU program starts, stops and supervises these resources while normal output loads continue through the remaining channels.

SECTION 05

Questions About This Product

How can the choice between Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1 avoid unused cabinet space or terminal shortages?

Map every required local input and output before selecting Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1. Include enclosure width and future expansion in the comparison: ST40 is 125 mm wide and ST60 is 175 mm wide, while both can still add six modules.

Why does a pulse train from Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1 stop at a lower frequency than expected?

For Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1, verify the exact high-speed output channel, configured mode, load interface and wiring capacitance. The 100 kHz capability belongs to designated transistor channels and does not transfer to every terminal automatically.

What causes intermittent input counts on Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1?

Confirm counter-channel assignment, input voltage quality, shielding and reference potential on Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1. A fast signal connected to an ordinary input or routed beside noisy power conductors can appear stable at low speed but fail at operating frequency.

Why can an expansion module disappear from Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1 after another module is added?

Recalculate the 5 V bus demand and inspect the right-side connectors on Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1. The total module count and current must remain within the six-module and 1,400 mA limits, and the project order must match the physical chain.

How should a CPU exchange on Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1 be prepared without losing the network plan?

Record the IP, device name, RS485 settings and hardware configuration for Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1 before replacement. Restore the exact model configuration first, then verify every network peer and I/O address against the installed size.

Why do several sourcing outputs on Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1 drop together under load?

On Siemens 6ES7288-1ST40-0AA1 / 6ES7288-1ST60-0AA1, simultaneous failures often point to a common supply, common terminal or group-current problem rather than several independent channels. Measure the field voltage under load and total the currents assigned to that common group.

SECTION 06

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SECTION 08

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