{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7157-0AC85-0XA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7157-0AC85-0XA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7157-0AC85-0XA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7157-0AC85-0XA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 6ES7157-0AC85-0XA0 Field Device Coupler for PROFIBUS PA and Foundation Fieldbus H1, with integrated bus supply up to 1000 mA, redundancy capability, and extended temperature range -40 to 70 °C.","salesMarkdown":"## Fieldbus coupler for PA/FF segments The Siemens 6ES7157-0AC85-0XA0 is a Field Device Coupler that bridges PROFIBUS DP to PROFIBUS PA or Foundation Fieldbus H1. It provides an integrated bus supply up to 1 A for up to 31 field devices, with redundancy capability. Operates from -40 to 70 °C ambient, per the datasheet. Power loss is 13.4 W typical at 24 V DC. The supply voltage range is 20.4 to 28.8 V DC, with reverse-polarity protection and a hold-up time of 5 ms on mains failure. Galvanic isolation is tested at 600 V DC between supply and all other circuits, as well as between DP, PA, and backplane bus. Overvoltage protection is included. ## Diagnostic indicators Onboard LEDs report group error (red), bus fault BF (red), bus activity on DP (yellow) and PA (yellow), plus supply voltage OK (green). A diagnostics function is additionally available via the DP protocol.","metaTitle":"Siemens 6ES7157-0AC85-0XA0 Field Device Coupler, -40 to 70°C","metaDescription":"Current-stage Siemens 6ES7157-0AC85-0XA0 Field Device Coupler for PROFIBUS PA/FOUNDATION Fieldbus. Supports 31 devices, 1A output, 13.4W loss. Extended temp -40 to 70°C. Sourced to","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["PLC Communication Modules"],"specifications":{"Max.":"70 °C","Min.":"-40 °C","Depth":"130 mm","Width":"80 mm","title":"6ES7157-0AC85-0XA0","Alarms":"Yes","Height":"125 mm","PROFIBUS DP":"Yes","PROFIBUS PA":"Yes","description":"Field Device Coupler FDC 157 physical interface for PROFIBUS PA or Foundation Fieldbus H1 integrated bus supply up to 1000 mA with redundancy capability integrated diagnostics Degree of protection IP20 for extended temperature range","Operation, max.":"95 %","Weight, approx.":"550 g","lifecycle_stage":"current","Power loss, typ.":"13.4 W","Rated value (DC)":"24 V","Status indicator":"Yes; Group error (red)","Bus fault BF (red)":"Yes","Product description":"Field Device Coupler for PROFIBUS PA and Foundation Fieldbus","Diagnostics function":"Yes","Group error SF (red)":"Yes","Isolation tested with":"600 V DC","Overvoltage protection":"Yes","IP degree of protection":"IP20","Transmission rate, max.":"31.25 kbit/s","Bus activity DP (yellow)":"Yes","Bus activity PA (yellow)":"Yes","Current consumption, max.":"2.3 A; At 24 V DC","Reverse polarity protection":"Yes","Design of electrical connection":"9-pin sub D","permissible range, lower limit (DC)":"20.4 V","permissible range, upper limit (DC)":"28.8 V","Between Supply And All Other Circuits":"Yes","Number of connectable PA field devices":"31","Current output to PA field devices, max.":"1 A","Mains/voltage failure stored energy time":"5 ms","Monitoring 24 V voltage supply ON (green)":"Yes","Installation altitude above sea level, max.":"3 000 m","between PROFIBUS DP and all other circuit components":"Yes","between PROFIBUS PA and all other circuit components":"Yes","Between Backplane Bus And All Other Circuit Components":"Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$825.50","stockQuantity":0,"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=66291&mlfb=6ES7157-0AC85-0XA0"},"ai":{"faq":[{"question":"What is the ambient temperature range for this coupler?","answer":"Rated for -40 to 70 °C operating ambient, covering extended temperature applications."},{"question":"How many PA field devices can it power?","answer":"Supports up to 31 PA devices with a maximum bus output current of 1 A."},{"question":"What diagnostic indicators are available?","answer":"Onboard LEDs for group error (red), bus fault (red), bus activity DP (yellow), bus activity PA (yellow), and supply voltage OK (green). Diagnostics function is also available via DP protocol."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7157-0AC85-0XA0","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/6ES7157-0AC85-0XA0 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}}