Compact local control
Twelve onboard inputs and eight relay outputs cover small machine sequences without requiring a separate base I/O rack.
Technical Summary
Controller profile6ES7288-1SR20-0AA1 is the CPU SR20 member of the SIMATIC S7-200 SMART family. Its integrated AC/DC/relay architecture combines the controller, mains-capable supply and local relay outputs in a 90 mm-wide housing.
The -0AA1 execution accepts 85 to 264 V AC at 47 to 63 Hz and also supports 77 to 138 V DC. Engineering is performed with STEP 7 Micro/WIN SMART, with Ethernet and RS485 available directly on the CPU.
Local inputs12 × 24 V DC
Local outputs8 × relay, 2 A
Memory20 KB program/data
Housing width90 mm
Specifications
Official product data| Manufacturer | Siemens |
|---|---|
| Product family | SIMATIC S7-200 SMART |
| Exact article number | 6ES7288-1SR20-0AA1 |
| CPU designation | CPU SR20 AC/DC/Relay |
| Supply range | 85–264 V AC, 47–63 Hz; 77–138 V DC |
| Integrated digital inputs | 12 × 24 V DC |
| Integrated digital outputs | 8 × relay, 2 A |
| Program memory | 12 KB |
| User data memory | 8 KB |
| Optional memory card | microSDHC |
| Communication interfaces | 1 × Industrial Ethernet; 1 × RS485 |
|---|---|
| PROFINET IO devices | Up to 8 connectable devices |
| High-speed counters | 6 |
| Real-time clock backup | 7 days; hardware clock without battery backup |
| Power loss, maximum | 14 W |
| Backplane/EM bus output | 5 V DC, maximum 1.4 A |
| Engineering software | STEP 7 Micro/WIN SMART |
| Mounting standard | Standard DIN rail |
Features
Integrated capabilitiesDual communications
Industrial Ethernet supports controller networking while the onboard RS485 channel remains available for serial integration.
Technology functions
Six hardware counters provide a defined path for fast input events within the CPU SR20 hardware boundary.
Service continuity
Optional microSDHC support and a seven-day real-time-clock backup support controlled maintenance and recovery workflows.
Compatibility
System fitUse a STEP 7 Micro/WIN SMART project that matches the installed CPU and firmware release.
Plan no more than eight connected PROFINET IO devices and retain the configured device names and addressing.
Preserve RS485 port parameters, station addresses, termination and the existing network topology.
The -0AA1 hardware belongs to the current firmware line; confirm the installed version before loading a project or update package.
Replacement
Controlled exchangeBefore removal
- Record the complete 6ES7288-1SR20-0AA1 label, firmware version, Ethernet settings and RS485 parameters.
- Export the approved STEP 7 Micro/WIN SMART project and preserve any microSDHC service media.
- De-energize the CPU supply and every external circuit connected to the relay outputs.
Before restart
- Confirm the 90 mm housing, twelve-input/eight-output wiring map and supply range before reconnecting conductors.
- Restore the validated project, then test every local input, relay output and communication path.
- Do not substitute CPU SR30 or CPU SR40 solely by family name; their width, I/O count and memory allocation differ.
FAQ
Customer checksQ01Can 6ES7288-1SR20-0AA1 replace an earlier SR20 execution without engineering work?
No automatic assumption should be made. Compare the complete suffix, firmware, project version, supply wiring and communications record before exchange.
Q02What should accompany a quotation request for 6ES7288-1SR20-0AA1?
Provide a clear product-label image, quantity, current firmware, project archive, installed expansion modules and the destination country.
Q03Can 6ES7288-1SR20-0AA1 be replaced by an SR30 or SR40 CPU?
Not as a drop-in exchange. The larger CPUs have different housing widths, local I/O counts and memory allocations, so wiring and the validated project must be reviewed.
Q04Which circuits must be isolated before removing 6ES7288-1SR20-0AA1?
Isolate the CPU supply and all externally sourced voltages switched by the relay contacts; a stopped program does not make those terminals safe.
Q05What proves 6ES7288-1SR20-0AA1 is ready to return to service?
A controlled restart should verify the loaded project, clock, Ethernet and RS485 communications, all local I/O points, alarms and every affected machine safety function.
About IndustryParts
https://www.industryparts.com/Compact CPU identity stays connected to the installed machine record
IndustryParts handles 6ES7288-1SR20-0AA1 by exact article number and keeps the CPU label, firmware boundary, project evidence and I/O map together for quotation review.
- Exact -0AA1 execution retained
- Project and network records reviewed
- Local I/O boundary kept visible
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