{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7340-1AH02-0AE0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7340-1AH02-0AE0","canonicalUrl":"https://aoctrl.com/siemens/6ES7340-1AH02-0AE0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7340-1AH02-0AE0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-300 CP 340 communications processor, RS232C interface, 6ES7340-1AH02-0AE0, EOL hot, max. 70 °C, min. -40 °C.","salesMarkdown":"## CP 340, end-of-life reality The 6ES7340-1AH02-0AE0: The temperature range — min. -40 °C, max. 70 °C — means it survives the nacelle environment on a cold winter night at hub height, where the controller cabinet sees ambient swings that kill a standard industrial module. No up-tower swaps if the CP 340 is already in the rack. ## Sourcing a discontinued CP 340 Because this CP 340 is EOL hot, it is sourced through independent distribution against an RFQ. The BOM line that calls out 6ES7340-1AH02-0AE0 can be filled, but the procurement planner should budget for a last-time-buy or a qualified replacement. The module draws up to 165 mA from the 5 V backplane bus and dissipates 0.85 W max — the S7-300 rack power budget needs to account for this even if the rest of the slot configuration is low-power. ## RS232C serial interface parameters The single isolated RS232C interface runs at transmission rates from 2.4 kbit/s up to 19.2 kbit/s. With the 3964(R) protocol it hits the full 19.2 kbit/s; with the ASCII protocol the max drops to 9.6 kbit/s. Cable length is limited to 15 m — standard RS232 reach, but the isolation helps avoid ground loops in a mixed-voltage cabinet. The communications processor supports a 1 024 byte buffer for both ASCII and 3964(R) protocols, and the FB length in RAM is 2 700 bytes for data communication sending and receiving. No RK 512 protocol support, and customer-specific drivers are not reloadable.","metaTitle":"Siemens 6ES7340-1AH02-0AE0 CP 340, RS232C, EOL","metaDescription":"Siemens 6ES7340-1AH02-0AE0 CP 340 communications processor, RS232C, EOL hot. Sourced to order against RFQ. Max. 70 °C, min. -40 °C, 19.2 kbit/s.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLC I/O & Expansion Modules"],"specifications":{"Max.":"70 °C","Min.":"-40 °C","ASCII":"1 024 byte","Depth":"120 mm","Width":"40 mm","Height":"125 mm","RK 512":"No","24 V DC":"No; Power supply via backplane bus 5V","3964 (R)":"1 024 byte","Connector type":"9-pin sub D connector","Weight, approx.":"300 g","lifecycle_stage":"eol_hot","Power loss, max.":"0.85 W","Power loss, typ.":"0.6 W","Cable length, max.":"15 m","Supported Printers":"HP-Deskjet, HP-Laserjet, IBM-Proprinter, user-defined","Interfaces/bus type":"RS 232C (V.24)","Number of interfaces":"1; Isolated","FB length in RAM, max.":"2 700 byte; Data communication, sending and receiving","Transmission rate, max.":"19.2 kbit/s","Transmission rate, min.":"2.4 kbit/s","With Printer Driver, Max.":"9.6 kbit/s","with ASCII protocol, max.":"9.6 kbit/s","with 3964 (R) protocol, max.":"19.2 kbit/s","from backplane bus 5 V DC, max.":"165 mA","Customer-Specific Drivers Reloadable":"No","Design of electrical connection for supply voltage":"Over backplane bus"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$442.25 – $690.00","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/bfe44a7589db3d654775fcdb26b7fb7d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=335360&mlfb=6ES7340-1AH02-0AE0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7340-1AH02-0AE0/alternatives.json"},"ai":{"faq":[{"question":"What is the replacement for 6ES7340-1AH02-0AE0?","answer":"No official successor order code is recorded for this CP 340. For a drop-in fit in an S7-300 rack with an isolated RS232C interface, a qualified substitute would need to match the 40 mm width, backplane bus power, and the 3964(R) / ASCII protocol buffer. Confirm the replacement against the existing configuration before committing the BOM."},{"question":"Where can I buy 6ES7340-1AH02-0AE0 available via RFQ confirmation?","answer":"This EOL hot CP 340 is sourced to order against an RFQ through independent distribution."},{"question":"Is 6ES7340-1AH02-0AE0 compatible with S7-300?","answer":"Yes, the 6ES7340-1AH02-0AE0 is a SIMATIC S7-300 CP 340 communications processor designed for the S7-300 rack. It draws power from the backplane bus and fits the standard 40 mm wide module slot."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7340-1AH02-0AE0","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/6ES7340-1AH02-0AE0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}