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PRODUCT DESCRIPTION
6ES7288-1CR20-0AA1 controls compact hardwired sequences
Siemens 6ES7288-1CR20-0AA1 is the SIMATIC S7-200 SMART CPU CR20s AC/DC/Relay controller. It combines 12 digital inputs, eight dry-contact relay outputs and one RS485 interface with 12 KB program memory and 8 KB user data memory. The official system manual specifies an 85 to 264 V AC or 77 to 138 V DC supply.
Use this compact serial CPU where the complete control task fits its onboard I/O and memory. CR20s does not support expansion modules, signal boards, Ethernet or pulse-train outputs. Check the load circuits, serial protocol and retained-data requirements before transferring an existing project.
Use this compact serial CPU where the complete control task fits its onboard I/O and memory. CR20s does not support expansion modules, signal boards, Ethernet or pulse-train outputs. Check the load circuits, serial protocol and retained-data requirements before transferring an existing project.
BEFORE YOU BUY
Check the actual CR20s control task
ACTUAL APPLICATIONS
6ES7288-1CR20-0AA1 supports discrete control and serial supervision
The Siemens system manual documents sequential-control examples, high-speed input counting and serial HMI connections. Implement these tasks within the CR20s onboard I/O limits; no Ethernet or expansion hardware is assumed.
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01 · SEQUENCE CONTROL
Execute a timed discrete operating cycle
Implement a defined sequence of states using the documented SCR instructions and timers. Siemens illustrates timed signal changes and transitions between operating states. Map the actual inputs and relay loads, then validate every transition and restart condition in the machine project. -
02 · EVENT COUNTING
Register incoming equipment pulses
Use the documented high-speed counters to register suitable sensor pulses without relying only on the normal program scan. Select single-phase or A/B operation within the CR20s frequency limits, verify signal levels and shielding, and test count direction and reset behavior. -
03 · OPERATOR SUPERVISION
Connect an operator device over RS485
Use a compatible serial HMI connection to exchange the configured operator data with the compact CPU. The manual lists up to four serial HMI connections per port. Match addresses and communication settings and verify that operator commands and displayed values map to the intended project data.
Technical specifications for 6ES7288-1CR20-0AA1
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Product Model6ES7288-1CR20-0AA1
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Product ParametersCompact Relay Output Controller
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In stock1 unit
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ManufacturerSiemens
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Supply operating range85 to 264 V AC or 77 to 138 V DC
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AC supply frequency47 to 63 Hz
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Onboard digital inputs12; sink/source, nominal 24 V DC
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Relay outputs8 dry contacts; up to 2 A per point
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Relay switching frequency1 Hz maximum
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Program memory12 KB
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User data memory8 KB
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Retentive memory capacity2 KB maximum
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Serial interface1 RS485 port; no Ethernet port
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RS485 Freeport data rate1200 to 115200 bit/s
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High-speed counter capability4 single-phase counters at 100 kHz or 2 A/B counters at 50 kHz
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Expansion capabilityNo expansion modules or signal boards
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Sensor power output24 V DC nominal; 300 mA maximum
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Power dissipation6 W
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Hardware real-time clockNot available
View all additional
Alternative Names
6ES7288-1CR20-0AA1
Siemens CPU CR20s
S7-200 SMART Compact Serial Controller
SYSTEM & REPLACEMENT CHECK
Information needed before ordering
Three direct checks to secure your system integration and minimize ordering risks.
Information
System integration
Replacement check
Manuals & support
CR20s COMPACT SERIAL ARCHITECTURE
Plan onboard I/O before connecting the machine
The CPU has twelve digital inputs and eight relay outputs. It cannot accept expansion modules or signal boards, so verify the full physical I/O requirement before assigning it to a replacement or new control task.
Communication uses the onboard RS485 port. No Ethernet, PROFINET or Ethernet-based controller link is provided by this article. Coordinate programming access and the intended serial HMI or Freeport configuration.
Confirm the supply range, relay load circuits and separate sensor power budget. Keep the complete CR20s project within its program, user-data and retentive-memory limits.
Features:
- Onboard I/O only; no expansion modules
- RS485 serial communication; no Ethernet
- Separate sensor supply and relay load circuits
The Siemens 6ES7288-1CR20-0AA1 requires the onboard I/O budget, load wiring and serial project to be checked before system integration and commissioning.
INTERCHANGEABILITY
Verify the complete replacement identity before commissioning
Match 6ES7288-1CR20-0AA1 and the CPU CR20s designation before exchanging an installed controller. Other SMART CPUs can have different supplies, interfaces and expansion capabilities.
Record the complete project, serial settings, input allocation, output commons and retentive ranges. Arrange a controlled shutdown and verify the correct maintenance isolation before disturbing wiring.
After reconnecting the verified wiring, load and check the matching project. Test each input and relay output, serial data exchange and the required power-cycle behavior before releasing the equipment.
Features:
- Match CR20s identity and relay wiring
- Keep a verified serial project backup
- Test retained data and output response
The Siemens 6ES7288-1CR20-0AA1 compact controller requires replacement verification of the project, onboard signals and external load circuits before the equipment returns to service.
DOCUMENTATION STATUS
Browse the Manuals, Datasheets, Official Documents, Links
Important Notice: The manual extract preserves the official CR20s specification columns and its exact wiring page. Shared tables also show ST20 and SR20; use the CR20s column. The complete Siemens manual remains necessary for installation safety and project engineering.
Features:
- Available Siemens document references are confirmed before order
- Check the CR20s column and exact wiring diagram
- Accessories are supplied only when listed in the quotation
Documentation for the Siemens 6ES7288-1CR20-0AA1 must be matched to the compact serial CPU; confirm manual availability in the written quotation.
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Important notice
Manuals, software, firmware, cables, calibration data and accessories are included only when listed in the quotation. AMIKON is an independent supplier and is not affiliated with or authorised by the manufacturer.
This content has been produced using multiple sources. Takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
BUYER INFORMATION
Commercial terms without hidden steps
Your written quote confirms the product identity, price, availability, lead time, warranty and shipping terms before payment.
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01
Shipping & delivery
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DispatchEligible stock: same / next day
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CarriersDHL, FedEx or UPS
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Ship fromXiamen, China
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Packed size13.7 × 12.1 × 11.3 cm
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Shipping weightApprox. 0.36 kg
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Payment & customs
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PaymentBank transfer (T/T)
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CurrenciesUSD · EUR · GBP · RMB
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Credit cardsNot accepted
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HS reference85371091
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OriginChina
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Warranty & returns
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Warranty12 months from AMIKON
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InspectionLabel, condition and packing checks
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ReturnsPrior RMA authorisation required
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CompatibilityConfirm before order
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OEM warrantyDoes not apply
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Your written quote confirms the product identity, price, availability, lead time, warranty and shipping terms before payment.
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Dedicated account manager · 15+ years
FREQUENTLY ASKED QUESTIONS
Questions buyers ask about 6ES7288-1CR20-0AA1
Direct answers about identity, compatibility, stock, warranty, payment and shipping.
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Can an EM module be added after the twelve inputs are allocated?
No. The exact CR20s specification lists expansion modules and signal boards as unavailable. Complete the I/O allocation before ordering; a project requiring extra physical I/O needs a separately verified controller configuration. -
Does the 300 mA sensor supply provide the relay load power?
No. The sensor output is a nominal 24 V DC supply with a 300 mA limit. The relay outputs are dry contacts; their external load circuits and commons must be wired separately within the documented contact ratings. -
Can the relay outputs generate the pulse train for a stepper drive?
No. CR20s has no pulse-train output function, and its relays are limited to a maximum switching frequency of 1 Hz. High-speed input counting does not imply high-speed output capability. -
Will a production counter survive a power cycle simply because it is in V memory?
Only the configured retentive ranges are retained as documented. CR20s provides at most 2 KB of retentive memory. Review the selected V, M, counter and applicable timer ranges and test the required restart behavior. -
Can an Ethernet patch cable be used to download the spare CPU?
No. CR20s has no onboard Ethernet port. Use the documented serial programming connection and compatible STEP 7-Micro/WIN SMART project; plan access to the RS485 port before the maintenance window. -
Which current limit applies when several relay loads share a common?
The manual specifies up to 2 A per output point and 10 A per common. Both limits matter, together with load type and external protection. Do not calculate an allowable common current from the point count alone. -
Can a MicroSD card transfer the machine configuration into this CR20s?
No. The CR20s feature table lists memory-card support as unavailable. Maintain an accessible project backup and a verified serial programming arrangement for replacement and commissioning. -
Does the 10-million-cycle relay figure apply at rated load?
No. Siemens separates mechanical life without load from contact life at rated load. The manual lists 10 million mechanical cycles and 100000 contact cycles at rated load; assess switching duty rather than treating these as interchangeable figures.
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