Executes compact S7-200 SMART control applications with twenty onboard digital points.
Product Identification
6ES7288-1CR20-0AA1 is the Siemens SIMATIC S7-200 SMART CPU CR20s. The compact serial CPU uses an 85 to 264 V AC supply, 12 onboard 24 V DC inputs and 8 relay outputs rated 2 A.
The CPU provides 20 KB of program and data memory and is engineered with STEP 7-Micro/WIN SMART. Its serial-oriented CR architecture must remain separate from SR and ST standard CPUs.
The complete 0AA1 article number identifies the exact CPU generation and prevents a visually similar controller from being selected without compatibility review.
Engineering Data
| Manufacturer | Siemens |
|---|---|
| Exact article number | 6ES7288-1CR20-0AA1 |
| Product family | SIMATIC S7-200 SMART |
| CPU designation | CPU CR20s |
| CPU category | Compact serial CPU |
| CPU architecture | AC/DC/relay |
| Supply voltage | 85 to 264 V AC, 47 to 63 Hz |
| Digital inputs | 12 onboard, 24 V DC |
| Digital outputs | 8 onboard relay outputs, 2 A |
| Program and data memory | 20 KB |
| Bit execution time | 150 ns |
| Word execution time | 1.2 µs |
| Floating-point execution time | 3.6 µs |
| Engineering software | STEP 7-Micro/WIN SMART |
| Article generation | 0AA1 |
Functions
Switches field loads through eight onboard relay outputs.
Provides the CR-series serial communication architecture for compact controller systems.
Retains program and data in the documented 20 KB memory allocation.
Applications
- Compact machine control requiring AC-powered relay-output architecture.
- Serially connected S7-200 SMART systems engineered with Micro/WIN SMART.
- Panel replacements where the original CR20s terminal and communication plan must be retained.
- Small control stations requiring twelve inputs and eight relay outputs.
Lifecycle
- Archive the Micro/WIN SMART project, password state, serial configuration and complete label before shutdown.
- Verify AC supply, 24 V DC input commons, relay load ratings and contact suppression.
- Do not assume an SR20 or ST20 provides the same communication, supply or output architecture.
- After replacement, test every point, serial communications and the complete interlock sequence.
About IndustryParts
https://www.industryparts.com/Compact serial CPU selection keeps supply and outputs explicit
IndustryParts handles 6ES7288-1CR20-0AA1 with its complete CR20s identity, serial configuration and relay-load record preserved.
- CR20s identity retained
- Serial settings requested
- Relay architecture checked
FAQ
Is 6ES7288-1CR20-0AA1 interchangeable with an ST20 CPU?
No direct substitution should be assumed. CR20s uses AC supply and relay outputs, while ST20 uses a DC/DC/DC architecture.
What should accompany a 6ES7288-1CR20-0AA1 enquiry?
Provide the complete CPU label, Micro/WIN SMART project, serial-network settings, terminal photographs and relay-load list.
Why must the CR20s serial architecture be recorded?
Communication interfaces and project settings are part of the installed controller path and can differ from standard SR or ST CPUs.
How should relay loads be reviewed before CPU exchange?
Document load voltage and current, inductive-load suppression, shared commons and the approved isolation plan for every affected output.
What acceptance checks are required after installation?
Verify the project, serial link, every digital input and relay output and all machine interlocks under controlled conditions.
