{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7338-4BC01-0AB0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7338-4BC01-0AB0","canonicalUrl":"https://aoctrl.com/siemens/6ES7338-4BC01-0AB0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7338-4BC01-0AB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-300 signal module, 3 SSI encoders, 24 V DC, 20-pin front connector, 120 mm depth, end-of-life.","salesMarkdown":"## What this module does in an S7-300 rack The Siemens 6ES7338-4BC01-0AB0 is a signal module for the SIMATIC S7-300 family that reads position values from up to three SSI (synchronous-serial interface) absolute encoders. It includes two FREEZE inputs that latch the encoder values simultaneously on a trigger, which is useful for synchronized position capture on a moving axis. The module supports isochronous mode, meaning it can exchange process data with the CPU at a fixed bus cycle, keeping the position read deterministic for motion-control applications. ## Supply and signal-level details Rated supply is 24 V DC (L+ minus 0.8 V), with a permissible range of 20.4 V to 28.8 V DC. The module draws up to 160 mA from the 5 V backplane bus and up to 100 mA from the load voltage L+ (unloaded). Power dissipation is typically 3 W. Signal thresholds are defined: a logic \"0\" spans -3 to +5 V, and a logic \"1\" spans 11 to 30.2 V. The input current for a \"1\" signal is typically 9 mA. The minimum transition time from \"0\" to \"1\" is 300 µs. ## Cable length limits by baud rate Maximum shielded cable length depends on the SSI clock frequency: 320 m at 125 kHz, 160 m at 250 kHz, 60 m at 500 kHz, and 20 m at 1 MHz. For standard encoder inputs (non-SSI), the maximum shielded cable length is 600 m. The module also supports 2-wire sensors (BERO) and provides a diagnostic alarm. The 20-pin front connector is required and sold separately.","metaTitle":"Siemens 6ES7338-4BC01-0AB0 SSI Encoder Module, EOL","metaDescription":"Siemens SIMATIC S7-300 signal module for 3 SSI encoders, 24 V DC, 120 mm depth. End-of-life (EOL) — sourced to order against RFQ. Supports isochronous mode.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLC I/O & Expansion Modules"],"specifications":{"24 V":"Yes; L+ (-0.8 V)","Depth":"120 mm","Width":"40 mm","Height":"125 mm","2-Wire Sensor":"Yes","For Signal \"0\"":"-3 to +5V","For Signal \"1\"":"11 to 30.2 V","Shielded, Max.":"600 m","Weight, approx.":"235 g","lifecycle_stage":"eol_hot","Diagnostic alarm":"Yes","Power loss, typ.":"3 W","Rated value (DC)":"24 V","At \"0\" To \"1\", Min.":"300 µs","For Signal \"1\", Typ.":"9 mA","Output current, max.":"900 mA","Absolute encoder (SSI)":"Yes","Required Front Connector":"20-pin","Cable length, shielded, max.":"320 m; 320 m at 125 kHz; 160 m at 250 kHz; 60 m at 500 kHz; 20 m at 1 MHz","from backplane bus 5 V DC, max.":"160 mA","permissible range, lower limit (DC)":"20.4 V","permissible range, upper limit (DC)":"28.8 V","Number of connectable encoders, max.":"3","from load voltage L+ (without load), max.":"100 mA","For Signal \"0\", Max. (Permissible Quiescent Current)":"2 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$335.28 – $676.87","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/69efc270bc02450c6c567e03510d2d2d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=369376&mlfb=6ES7338-4BC01-0AB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7338-4BC01-0AB0/alternatives.json"},"ai":{"faq":[{"question":"What are the specifications of 6ES7338-4BC01-0AB0?","answer":"It is a SIMATIC S7-300 signal module for up to three SSI absolute encoders with two FREEZE inputs. It requires a 20-pin front connector."},{"question":"Does 6ES7338-4BC01-0AB0 support isochronous mode?","answer":"Yes, the module supports isochronous mode, allowing deterministic data exchange with the S7-300 CPU at a fixed bus cycle."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7338-4BC01-0AB0","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/6ES7338-4BC01-0AB0 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}}