{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7138-4DF00-0AB0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7138-4DF00-0AB0","canonicalUrl":"https://aoctrl.com/siemens/6ES7138-4DF00-0AB0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7138-4DF00-0AB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens, SIMATIC DP, ET 200S, 1 SI serial interface module, 6ES7138-4DF00-0AB0, 15 mm wide, RS232/422/485, ASCII/3964R, 24 V DC, 1.2 W.","salesMarkdown":"## Slot fit and protocol handling The Siemens 6ES7138-4DF00-0AB0 is a current-production serial interface module for the ET 200S distributed I/O system, handling RS232, RS422, and RS485 with ASCII or 3964(R) protocol up to 19.2 kbps. The 15 mm width consumes one slot on the ET 200S terminal bus, and the module draws 1.2 W typical from the 24 V DC supply plus 10 mA from the backplane bus. The 7-byte send and receive buffer limits each serial message frame to 7 bytes – fine for small telegrams or parameter exchanges; larger payloads will need a different interface gateway. Protocol configuration includes ASCII with baud rates from 110 to 19.2 kbps, parity choices (none, odd, even, any), and 7 or 8 data bits with 1 or 2 stop bits. ## In the panel, on the rail This module mounts directly onto a compatible ET 200S base unit (BU type A0 or A1); the 52 mm depth and 81 mm height are standard for the family, so it sits flush with neighbours. The 1.2 W dissipation is low enough that no special ventilation is required – it runs cool even at 60 °C ambient in a densely packed cabinet. Wiring is handled by the base unit's spring-clamp terminals; the serial signals follow the pin assignments listed for RS232 (8 signals: TxD, RxD, RTS, CTS, DTR, DSR, DCD, PE –), RS422 (TxD(A/B), RxD(A/B), GND –), or RS485 (R/T(A/B), GND –). ## First power-up checks On initial power-up, verify the group-error SF LED (red –) stays off. If it lights, check backplane communication and 24 V DC supply. Set the protocol in the hardware configuration (STEP 7 or TIA Portal) – ASCII – and match the baud rate to the connected device (110 to 19.2 kbps). The module isolates the serial interfaces from the internal power supply, which helps avoid ground loops on long cable runs up to 1 200 m. ## Sourcing this serial slice Siemens lists this module as current production and a standard ET 200S catalog item. For BOM fill or a line-down swap, we source it through our Siemens direct channel. RFQ for lead time and quantity; module ships individually or in small lots.","metaTitle":"Siemens 6ES7138-4DF00-0AB0 ET 200S serial interface, 15 mm","metaDescription":"Current production serial interface module for ET 200S. RS232/422/485, ASCII/3964R, 24 V DC, 1.2 W, 0 °C to 60 °C. Sourced to order, specs verified. RFQ for your BOM.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLC I/O & Expansion Modules"],"specifications":{"Max.":"60 °C","Min.":"0 °C","Send":"7 byte","ASCII":"Yes","Depth":"52 mm","Width":"15 mm","title":"6ES7138-4DF00-0AB0","Height":"81 mm","Parity":"none, odd, even, any","RS 422":"TxD(A), RxD(A), TxD(B), RxD(B), GND","RS 485":"R/T(A), R/T(B), GND","RS 232C":"RS 232C signals: 8 (TxD, RxD, RTS, CTS, DTR, DSR, DCD, PE)","Receive":"7 byte","3964 (R)":"Yes","Receive RxD":"Yes","description":"SIMATIC DP, ELECTRONIC MODULE FOR ET 200S, 1 SI SERIAL INTERFACE ONE CHANNEL, 15MM WIDE RS232/422, 485 ASCII, 3964R","Transmit TxD":"Yes","Standard blocks":"2 700 byte; P_SEND, P_RCV in S7-CPU","Weight, approx.":"50 g","lifecycle_stage":"current","Power loss, typ.":"1.2 W","Rated value (DC)":"24 V","Bits per character":"7 or 8","Cable length, max.":"1 200 m","Group error SF (red)":"Yes","Number of interfaces":"1","Bits per character frame":"10","Number of start/stop bits":"1 or 2","with ASCII protocol, max.":"19.2 kbit/s; full duplex: 110, 300, 600, 1 200, 2 400, 4 800, 9 600, 19 200 bps","with 3964 (R) protocol, max.":"19.2 kbit/s; half duplex: 110, 300, 600, 1 200, 2 400, 4 800, 9 600, 19 200 bps","from backplane bus 3.3 V DC, max.":"10 mA","between RS 232 and internal power supply":"Yes","Between RS 422/485 and internal power supply":"Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$219.46","stockQuantity":0,"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=343109&mlfb=6ES7138-4DF00-0AB0"},"ai":{"faq":[{"question":"What is the maximum ambient temperature for the 6ES7138-4DF00-0AB0?","answer":"The maximum is 60 °C."},{"question":"What is the minimum ambient temperature for the 6ES7138-4DF00-0AB0?","answer":"The minimum is 0 °C."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7138-4DF00-0AB0","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/6ES7138-4DF00-0AB0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}