Siemens 6ES7288-1SR40-0AA1 is a SIMATIC S7-200 SMART CPU SR40 developed for compact machines that require a larger onboard I/O complement. The AC/DC/relay controller operates from an 85 to 264 V AC supply and integrates 24 digital inputs for 24 V DC signals together with sixteen relay outputs rated up to 2 A, allowing sensors and switched auxiliary loads to be coordinated without a separate base unit.
The CPU provides 40 KB of integrated program and data memory, web-server support and onboard Ethernet and RS485 communication for engineering and system integration. It is configured with STEP 7 Micro/WIN SMART; power protection, relay loading, grounding, expansion-module selection, network settings and commissioning must follow the current Siemens S7-200 SMART System Manual.
Siemens 6ES7288-1SR40-0AA1 is configured with STEP 7 Micro/WIN SMART and forms part of the SIMATIC S7-200 SMART controller family. Compatible expansion is based on S7-200 SMART signal modules and the supported signal board selected according to I/O type, module power demand and CPU firmware.
The integrated Ethernet and RS485 ports support the communication functions documented for this CPU, including engineering, controller, HMI and field-device connections. Verify firmware revisions, network parameters, relay loading, expansion limits and installation conditions in the current Siemens S7-200 SMART System Manual.

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