{"id":244290,"date":"2024-10-19T16:02:49","date_gmt":"2024-10-19T16:02:49","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-61158-4-22014\/"},"modified":"2024-10-25T11:01:45","modified_gmt":"2024-10-25T11:01:45","slug":"bs-en-61158-4-22014","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-61158-4-22014\/","title":{"rendered":"BS EN 61158-4-2:2014"},"content":{"rendered":"

1.1 General<\/b><\/p>\n

The data-link layer provides basic time-critical messaging communications between devices in an automation environment.<\/p>\n

This protocol provides communication opportunities to all participating data-link entities, sequentially and in a cyclic synchronous manner. Foreground scheduled access is available for time-critical activities together with background unscheduled access for less critical activities.<\/p>\n

Deterministic and synchronized transfers can be provided at cyclic intervals up to 1 ms and device separations of 25 km. This performance is adjustable dynamically and on-line by re-configuring the parameters of the local link whilst normal operation continues. By similar means, DL connections and new devices may be added or removed during normal operation.<\/p>\n

This protocol provides means to maintain clock synchronization across an extended link with a precision better than 10 \u00b5s.<\/p>\n

This protocol optimizes each access opportunity by concatenating multiple DLSDUs and associated DLPCI into a single DLPDU, thereby improving data transfer efficiency for data-link entities that actively source multiple streams of data.<\/p>\n

The maximum system size is an unlimited number of links of 99 nodes, each with 255 DLSAP-addresses. Each link has a maximum of 224<\/sup> related peer and publisher DLCEPs.<\/p>\n

1.2 Specifications<\/b><\/p>\n

This standard specifies<\/p>\n

    \n
  1. \n

    procedures for the timely transfer of data and control information from one data-link user entity to a peer user entity, and among the data-link entities forming the distributed data-link service provider;<\/p>\n<\/li>\n

  2. \n

    the structure of the fieldbus DLPDUs used for the transfer of data and control information by the protocol of this standard, and their representation as physical interface data units.<\/p>\n<\/li>\n<\/ol>\n

    1.3 Procedures<\/b><\/p>\n

    The procedures are defined in terms of<\/p>\n

      \n
    1. \n

      the interactions between peer DL-entities (DLEs) through the exchange of fieldbus DLPDUs;<\/p>\n<\/li>\n

    2. \n

      the interactions between a DL-service (DLS) provider and a DLS-user in the same system through the exchange of DLS primitives;<\/p>\n<\/li>\n

    3. \n

      the interactions between a DLS-provider and a Ph-service provider in the same system through the exchange of Ph-service primitives.<\/p>\n<\/li>\n<\/ol>\n

      1.4 Applicability<\/b><\/p>\n

      These procedures are applicable to instances of communication between systems which support time-critical communications services within the data-link layer of the OSI or fieldbus reference models, and which require the ability to interconnect in an open systems interconnection environment.<\/p>\n

      Profiles provide a simple multi-attribute means of summarizing an implementation\u2019s capabilities, and thus its applicability to various time-critical communications needs.<\/p>\n

      1.5 Conformance<\/b><\/p>\n

      This standard also specifies conformance requirements for systems implementing these procedures. This standard does not contain tests to demonstrate compliance with such requirements.<\/p>\n","protected":false},"excerpt":{"rendered":"

      Industrial communication networks. Fieldbus specifications – Data-link layer protocol specification. Type 2 elements<\/b><\/p>\n\n\n\n\n
      Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
      BSI<\/b><\/a><\/td>\n2014<\/td>\n342<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":244297,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[385,2641],"product_tag":[],"class_list":{"0":"post-244290","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-25-040-40","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/244290","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/244297"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=244290"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=244290"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=244290"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}