{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7138-4DH00-0AB0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7138-4DH00-0AB0","canonicalUrl":"https://aoctrl.com/siemens/6ES7138-4DH00-0AB0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7138-4DH00-0AB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC ET 200S, SSI absolute encoder module, 6ES7138-4DH00-0AB0, 24 V DC, 52 mm depth.","salesMarkdown":"## SSI Encoder Input on ET 200S The Siemens 6ES7138-4DH00-0AB0 is an SSI absolute encoder module for the ET 200S distributed I/O system. It reads 13-, 21-, or 25-bit position data over RS-422, supporting Gray or binary code. The latch time sits at 400 µs plus age of encoder value—that's the window for synchronizing the position capture across multiple axes. Shielded cable runs to 1 000 m; unshielded drops to 600 m. On a noisy plant floor, shield it properly. Three digital inputs and three digital outputs ride alongside the encoder input on the same module. The inputs handle 24 V DC signals (L+ -1 V minimum) with type 2 2-wire sensor compatibility. Outputs switch inductive loads up to 2 Hz or resistive loads at 100 Hz. Short-circuit and reverse-polarity protection are onboard. ## vs. the SIPLUS Variant The 6AG1123-2DB03-2AX0 is the SIPLUS version of this encoder module, built for extended temperature ranges and conformal-coated boards. If the panel lives in a conditioned room, the standard 6ES7138-4DH00-0AB0 is the correct call. If the cabinet faces -40 °C or corrosive atmospheres, the SIPLUS is the better fit. Footprint and wiring are identical—drop-in from a panel layout perspective.","metaTitle":"Siemens 6ES7138-4DH00-0AB0 ET 200S SSI Encoder, 52mm","metaDescription":"Siemens SIMATIC ET 200S SSI absolute encoder module 6ES7138-4DH00-0AB0. 3 DI, 3 DO, 24 V DC, 52 mm depth. Active production; sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLC I/O & Expansion Modules"],"specifications":{"Depth":"52 mm","Latch":"400 µs; plus age of encoder value","Width":"30 mm","Height":"81 mm","Remark":"16 byte","Gray code":"1","Binary code":"1","Input signal":"to RS 422; 13, 21, 25 bit","2-Wire Sensor":"Yes; Type 2","For Signal \"0\"":"-30 to +5 V","For Signal \"1\"":"+11 to +30V","Shielded, Max.":"1 000 m","Weight, approx.":"65 g","lifecycle_stage":"current","\"0\" To \"1\", Max.":"1.3 ms; typically 150 µs","\"1\" To \"0\", Max.":"200 µs; typically 150 µs","Power loss, typ.":"2 W","Rated value (DC)":"24 V","Unshielded, Max.":"600 m","On Lamp Load, Max.":"10 Hz","At \"0\" To \"1\", Min.":"500 µs","For Signal \"0\", Max.":"3 V","For Signal \"1\", Min.":"L+ (-1 V)","For Signal \"1\", Typ.":"9 mA","Group error SF (red)":"Yes","Absolute encoder (SSI)":"Yes","Number of digital inputs":"3","Response threshold, typ.":"0.7 to 1.8 A","Short-circuit protection":"Yes","Number of digital outputs":"3","With Inductive Load, Max.":"2 Hz","With Resistive Load, Max.":"100 Hz","Controlling a digital input":"Yes","Reverse polarity protection":"Yes","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, 8 m at 2 MHz, twisted in pairs and shielded","Positioning mode POS (green)":"Yes","Actual value rising UP (green)":"Yes","Actual value falling DN (green)":"Yes","from backplane bus 3.3 V DC, max.":"10 mA","permissible range, lower limit (DC)":"20.4 V","permissible range, upper limit (DC)":"28.8 V","For Signal \"0\" Residual Current, Max.":"3 mA","Module exchange under process voltage":"Yes","Between The Channels And Backplane Bus":"Yes","Status indicator digital input (green)":"Yes","Updating time of the feedback messages":"2 ms","from load voltage L+ (without load), max.":"50 mA","Limitation of inductive shutdown voltage to":"L+ (-55 to -60 V)","Response time at switchover/switchoff point":"Output delay + message frame runtime + 30 µs","Module exchange during operation of the IM-DP":"Yes","For Signal \"0\", Max. (Permissible Quiescent Current)":"2 mA","for signal \"1\" permissible range for 0 to 60 °C, max.":"600 mA","for signal \"1\" permissible range for 0 to 60 °C, min.":"7 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$533.40","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e5444c2a6d45e12e1a825e1259ff12c7.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=472907&mlfb=6ES7138-4DH00-0AB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7138-4DH00-0AB0/alternatives.json"},"ai":{"faq":[{"question":"What is the cable length for an SSI encoder with this module?","answer":"Maximum shielded cable length is 1 000 m. For unshielded runs, the maximum is 600 m. Cable length also depends on SSI clock frequency; at 125 kHz shielded runs can go 320 m, at 250 kHz 160 m, at 500 kHz 60 m, at 1 MHz 20 m, and at 2 MHz 8 m."},{"question":"Will the SIPLUS version 6AG1123-2DB03-2AX0 drop in without rewiring?","answer":"Yes, the 6AG1123-2DB03-2AX0 (SIPLUS) has the same pinout and mechanical dimensions as the standard 6ES7138-4DH00-0AB0. They are interchangeable in the same ET 200S slot; wiring is identical."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7138-4DH00-0AB0","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/6ES7138-4DH00-0AB0 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}}