{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7157-0AG81-0XA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7157-0AG81-0XA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7157-0AG81-0XA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7157-0AG81-0XA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens AFD4 field distributor, 6ES7157-0AG81-0XA0, PROFIBUS PA / FOUNDATION Fieldbus H1, IP66, -40 to 85 °C, ATEX Zone 2/22.","salesMarkdown":"## Fieldbus junction box for hazardous-area loops The Siemens 6ES7157-0AG81-0XA0 is an AFD4 field distributor that connects up to four spur instruments to a PROFIBUS PA or FOUNDATION Fieldbus H1 main line. It carries automatic bus termination and reverse-polarity protection when paired with the FDC 157 power conditioner. The enclosure is rated IP66, so it withstands washdown and outdoor exposure directly on the skid or pipe rack. ## Hazardous-area approvals and temperature envelope Rated for ATEX Zone 2 and Zone 22, plus FM Class I Zone 2 / Division 2 — this unit sits in the gas-group and dust-group classified area, not the Zone 1/21 inner boundary. The ambient range spans -40 °C to 85 °C, covering cold-climate outdoor racks and hot-process skids without a heater or sunshade. ## Spur line budget and loop power Each spur line is limited to 60 mA permissible current. The unit draws 264 mA max from the bus, with a typical power loss of 384 mW and a ceiling of 3.2 W.","metaTitle":"Siemens 6ES7157-0AG81-0XA0 AFD4 Field Distributor","metaDescription":"Siemens 6ES7157-0AG81-0XA0 AFD4 field distributor for PROFIBUS PA and FOUNDATION Fieldbus H1. IP66, -40 to 85 °C, ATEX Zone 2/22.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["PLC Communication Modules"],"specifications":{"Max.":"85 °C","Min.":"-40 °C","Depth":"83 mm","Width":"220 mm","Alarms":"No","Height":"120 mm; without screw glands","ATEX Zone 1":"No","ATEX Zone 2":"Yes","PROFIBUS DP":"No","PROFIBUS PA":"Yes","AS-Interface":"No","ATEX Zone 21":"No","ATEX Zone 22":"Yes","Operation, max.":"95 %","Weight, approx.":"2 000 g","lifecycle_stage":"current","Main line status":"Yes","Power loss, max.":"3.2 W","Power loss, typ.":"384 mW","Status indicator":"Yes","FM Class I Zone 1":"No","Main line failure":"Yes","Repeater function":"No","Diagnostics function":"Yes","No-load voltage, max.":"30 V","FOUNDATION Fieldbus H1":"Yes","Overvoltage protection":"No","Spur line status/fault":"Yes","IP degree of protection":"IP66","Transmission rate, max.":"31.25 kbit/s","Automatic Bus Termination":"Yes","Current consumption, max.":"264 mA","Reverse polarity protection":"Yes; only in conjunction with FDC 157","FM Class I Zone 2, Division 2":"Yes","Between Main Line And Spur Lines":"No","Permissible Current Per Spur Line":"60 mA","design of the PROFIBUS PA spur line":"Type A","permissible range, lower limit (DC)":"16 V","permissible range, upper limit (DC)":"32 V","design of the PROFIBUS PA main cable":"Type A","Number of connectable PA field devices":"4","Current output to PA field devices, max.":"240 mA","Current consumption (in no-load operation), typ.":"24 mA; 54 mA at the end of the cable","number of PROFIBUS PA field devices / connectable":"4","number of connections / for PROFIBUS PA spur line":"4","number of connections / for PROFIBUS PA main cable":"2","design of the electrical connection / for PROFIBUS PA spur line":"Screw terminal block","design of the electrical connection / for PROFIBUS PA main cable":"Screw terminal block"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$554.99","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/599fb3d3d8592ec955b0ddbf0a810439.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=508127&mlfb=6ES7157-0AG81-0XA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7157-0AG81-0XA0/alternatives.json"},"ai":{"faq":[{"question":"Is 6ES7157-0AG81-0XA0 compatible with FOUNDATION Fieldbus H1?","answer":"Yes, the unit supports both PROFIBUS PA and FOUNDATION Fieldbus H1 on the same hardware — it is a dual-protocol field distributor. The transmission rate is fixed at 31.25 kbit/s, the standard for both PA and H1 physical layers."},{"question":"Does the 6ES7157-0AG81-0XA0 have automatic bus termination?","answer":"Yes, automatic bus termination is built in — no external terminator resistor needed at the end of the PA segment."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7157-0AG81-0XA0","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/6ES7157-0AG81-0XA0 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}}