{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7340-1CH00-0AE0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7340-1CH00-0AE0","canonicalUrl":"https://aoctrl.com/siemens/6ES7340-1CH00-0AE0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7340-1CH00-0AE0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-300 CP 340 communication processor, RS422/485 isolated interface, 19.2 kbit/s, 1200 m cable, 40 x 125 x 120 mm.","salesMarkdown":"## What this CP 340 does on the S7-300 backplane The Siemens 6ES7340-1CH00-0AE0 is a CP 340 communication processor for the S7-300 rack, providing a single isolated RS422/485 interface for point-to-point serial links to drives, printers, barcode readers, or other controllers running ASCII or 3964(R) protocols. It draws 165 mA from the 5 V DC backplane bus and dissipates 0.85 W — within the typical S7-300 slot budget, provided the rack power supply is sized for the full module complement. ## Serial link constraints — cable length, baud rate, and protocol The RS422/485 interface runs at 19.2 kbit/s maximum with 3964(R) protocol, dropping to 9.6 kbit/s with ASCII or the printer driver — the limiting factor is the UART and firmware overhead, not the transceiver. Maximum cable length is 1 200 m at the lower baud rates, which covers most plant-floor runs between control cabinets and remote I/O or field devices, provided the cable is terminated per RS485 practice. The ASCII buffer holds 1 024 byte, and the 3964(R) buffer is also 1 024 byte — adequate for short telegrams and parameter blocks, but a multi-drop poll cycle with long data frames may require the CP 341 if the buffer ceiling is hit. ## Printer support — a niche but documented capability The CP 340 can drive HP-DeskJet, HP-LaserJet, and IBM-Proprinter printers via the serial port at 9.6 kbit/s, and also accepts user-defined printer drivers — useful for legacy line-reporting stations where a PC-based print server is not available.","metaTitle":"Siemens 6ES7340-1CH00-0AE0 CP 340, RS422/485, EOL","metaDescription":"Siemens 6ES7340-1CH00-0AE0 CP 340 communication processor, RS422/485 interface, 19.2 kbit/s, 1200 m cable. End-of-life status. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLC I/O & Expansion Modules"],"specifications":{"ASCII":"1 024 byte","Depth":"120 mm","Width":"40 mm","Height":"125 mm","3964 (R)":"1 024 byte","Weight, approx.":"300 g","lifecycle_stage":"eol_hot","Power loss, max.":"0.85 W","Cable length, max.":"1 200 m","Supported Printers":"HP-Deskjet, HP-Laserjet, IBM-Proprinter, user-defined","Interfaces/bus type":"RS 422 / 485 (X.27)","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"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$817.00","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=298650&mlfb=6ES7340-1CH00-0AE0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7340-1CH00-0AE0/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7340-1CH00-0AE0","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/6ES7340-1CH00-0AE0 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}}