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Home>SIEMENS>Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1 | S7-200 SMART CR30s / CR40s CPUs
Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1 | S7-200 SMART CR30s / CR40s CPUs

Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1 | S7-200 SMART CR30s / CR40s CPUs Item NO.: 2926366

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Product Name Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1 | S7-200 SMART CR30s / CR40s CPUs
Item NO. 2926366
Weight 0.1 kg = 0.2205 lb = 3.5274 oz
Category SIEMENS
Brand SIEMENS
Creation Time 2026-10-23

Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1 | S7-200 SMART CR30s / CR40s CPUs

Siemens · SIMATIC S7-200 SMART

Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1 | S7-200 SMART CR30s / CR40s CPUs

SECTION 01

Product Introduction

Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1 are SIMATIC S7-200 SMART compact AC/DC/Relay CPUs with fixed onboard digital I/O. CR30s provides eighteen inputs and twelve relay outputs, while CR40s increases the terminal set to twenty-four inputs and sixteen relay outputs.

The compact design of Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1 does not accept right-side expansion modules or a signal board. Their 12 KB program, 8 KB data and 2 KB retentive areas therefore work with the fixed local point count selected at ordering time.

Serial equipment connects to Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1 through the isolated RS485 interface. System protocol rates of 9,600, 19,200 and 187,500 bit/s and freeport rates from 1,200 to 115,200 bit/s are available, while no PROFINET port is fitted to these AA1 compact variants.

SECTION 02

Technical Information

Technical dossier 6ES7288-1CR30-0AA1 6ES7288-1CR40-0AA1
Brand Siemens
Product Type CPU CR30s AC/DC/Relay CPU CR40s AC/DC/Relay
Brand Country Germany
Dimensions (W × H × D) 110 × 100 × 81 mm 125 × 100 × 81 mm
Weight 424 g 475 g
Power Dissipation 7 W 8 W
Program / Data / Retentive Memory 12 KB / 8 KB / 2 KB
Integrated Digital I/O 18 inputs / 12 relay outputs 24 inputs / 16 relay outputs
Expansion Modules / Signal Board Not supported
24 V Sensor Supply 300 mA maximum
Serial Interface 1 × isolated RS485
RS485 Freeport Rate 1,200 to 115,200 bit/s
High-Speed Counters 4
Ethernet / PROFINET Not fitted
SECTION 03

Product Functions

Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1 execute local logic against an I/O set that is fixed inside the CPU housing.

Thirty-point allocation›Forty-point allocation›No backplane growth
01

Thirty-point allocation

CR30s assigns eighteen input and twelve relay-output addresses without an external module chain.

02

Forty-point allocation

CR40s adds six inputs and four relay outputs, so cabinet wiring grows while the compact operating model remains the same.

03

No backplane growth

The selected fixed terminal count is the final local I/O capacity because neither CPU accepts a signal board or expansion module.

SECTION 04

Communication and Connectivity

Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1 use one RS485 channel as their external data path while retaining all digital control locally.

01

System-protocol rates

The RS485 port supports the published system rates for compatible devices on the serial network.

02

Freeport framing

User-programmed serial messages can operate from 1,200 to 115,200 bit/s when freeport mode is configured.

03

Isolated field connection

RS485 isolation separates the external serial signal from PLC logic, while cable shield and reference wiring still follow the network arrangement.

SECTION 05

Frequently Asked Questions

Why do added I/O modules stay unavailable beside Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1?

Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1 do not support expansion modules or a signal board. The project must fit within the fixed onboard point count or use an SR/ST CPU when a right-side module chain is required.

What should be changed when replacing Siemens 6ES7288-1CR30-0AA1 with 6ES7288-1CR40-0AA1?

A move within Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1 adds six inputs, four relay outputs and 15 mm of width. Update the exact hardware selection and reconcile field terminals and addresses before energizing the larger CPU.

Why can an Ethernet cable not connect Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1 to an HMI?

The AA1 compact variants Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1 do not include an Ethernet port. Use their RS485 communication path or select an officially specified CPU with the required LAN interface.

How should an RS485 timeout be investigated on Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1?

Check address, protocol, baud rate, parity, termination and cable polarity on Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1 before altering logic. All serial devices must use one compatible frame format and unique station addressing.

Why does one relay common overheat on Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1?

Total the simultaneous load current assigned to that common on Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1 and include load inrush. Several legal point currents can still exceed a shared common or conductor rating when they switch together.

Can a program for Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1 retain the same addresses after a CPU size change?

Only addresses that still correspond to the intended terminals should remain unchanged on Siemens 6ES7288-1CR30-0AA1 / 6ES7288-1CR40-0AA1. Compare the exact terminal map and verify every physical input and relay output instead of assuming the added points leave the complete layout untouched.

SECTION 06

Our Advantages

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SECTION 08

Contact & Enquiry

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