Discussion on comprehensive knowledge of the hotte

2022-09-30
  • Detail

JDF application comprehensive knowledge discussion five

(1) operation processing level

JDF live parts are composed of a series of nodes that specify production steps. The nodes are connected through input and output, and are arranged in a hierarchical tree structure. The nodes describe the different parts of the final product and production, such as the cover and insert in Figure 3. The branch information contained in the nodes becomes more detailed and accurate. Each sub node defines a component of production and has a series of unique characteristics, such as different media, different physical sizes, or different color requirements. The nodes in the middle layer of the tree represent a set of operations required to produce each part of the product. Each node close to the end of the branch represents a complete set of expensive separate operations. The child node cover and insert in the example have different requirements. Therefore, the two nodes need to better describe the living elements in a broad sense, and the inner page can be divided into black-and-white pages and color pages, which requires different operation methods, and further branching is necessary

figure 4jdf tree structure hierarchy

because the output resources of many JDF nodes are also the input resources of other nodes, many nodes do not start working until their resources are all established and the new ecosystem in the "interconnection +" period is in place, which means that nodes need to work in a set order. For example, the output resource of the plate making process, the printing plate, is the input resource required by the next printing process. In the JDF hierarchical tree structure, the upper node represents a higher-level and more abstract operation. On the contrary, close to the bottom represents a more detailed and specific operation. In particular, the nodes near the top of the tree only represent the meaning of each component of the product. Leaf nodes provide specific and detailed operation instructions for devices

in this hierarchical structure of node tree, nodes are connected to the business chain by their own resources, and the output resources of one node are the input resources of the next node. This relationship is called resource connection. Complex businesses can be built by using resource connections

because the output resources of many JDF nodes are also the input resources of other nodes, many nodes do not start working until their resources are all in place, which means that nodes need to work in a set order. For example, the output resource of the plate making process, the printing plate, is the input resource required by the next printing process. In the JDF hierarchical tree structure, the upper node represents a higher-level and more abstract operation. On the contrary, close to the bottom represents a more detailed and specific operation. In particular, the nodes near the top of the tree only represent the meaning of each component of the product. Leaf nodes provide specific and detailed operation instructions for devices

in this hierarchical structure of node tree, nodes are connected to the business chain by their own resources, and the output resources of one node are the input resources of the next node. This relationship is called resource connection. Complex businesses can be built by using resource connections

figure 5JDF tree/network diagram

the business connection in JDF is not clearly explained, and the nodes do not arrange Abstract schedules and instructions. For example, the chromatic printing node must be before the rip node, but is implicitly defined in the exchange of input and output. Good resource compliance builds a business path, and the execution of all businesses is driven by these compliance. A resource compliance may contain multiple business path scripts, MIS uses relevant local constraints to determine the appropriate solution, so the proxy server that writes JDF live parts in MIS should also be consistent with these local constraints, such as the dominance of prepress software, the transmission distance between prepress equipment and printing, printing load and delivery time, etc. All these factors are combined to describe the production process. In order to help the proxy server define the workflow, JDF provides four different types of basic service routing mechanisms, These routing mechanisms can be combined arbitrarily:

· continuous processing (in general, resources are produced and consumed continuously, and the simplest business chain)

· overlapping processing (production and consumption of resources at the same time)

· parallel processing (resource decomposition, domination and sharing)

· iterative processing (generate resources through loop iteration of pre and post-processing)

(2) MIS integration

it needs to make great efforts to coordinate the equipment of different manufacturers. Although XML language has the ability to encode multiple languages, it is not completely available. Moreover, in the printing workflow, the biggest and most important obstacle is that there are great problems in communication between the management information system (MIS) responsible for planning and control and the production service system responsible for operation. In other words, there is no automatic, coordinated and effective two-way communication between these two aspects. All data listing plans, arrangements, processing results, working conditions and work tracking must be transferred from the production department to MIS before MIS can process information and provide instructions

figure 6

jdf provides a mechanism for natural production system to control and track live parts. At the same time, it provides information transmission services between MIS and production. Due to the high degree of automation in the execution process of live parts, the results of each processing process are stored for better tracking. The system defines a series of standard information, information format and equipment execution agreements. In addition, it also provides the range of information volume, with the minimum acceptance of zero information. When there is no information selection, the controller must check JDF to determine the processing result. Independent of the information capacity, JDF includes different audit records of each processing process, which provides details of the processing plan and actual results. Most devices will choose to support different levels of information capacity

the equipment must support the command function. If the equipment selects the command function, the controller can issue instructions to interrupt the current work, restart a work or change the priority of the work. In addition to communication, JDF can also support the controller to collect the execution data of each processing process and transmit the information to the tracking system for use by the job accounting system

in addition, the whole work information can also be transmitted to the job accounting system. The system then checks the audit records to determine the cost of the whole live parts. Each individual project manager selects one or more operations to complete each individual work. At the beginning of the first version, JDF was irrelevant to the equipment supplier, which ensures that all providers can use JDF to develop the system, No provider is at a disadvantage in the competition

JDF defines a message architecture, including message format, semantics and communication protocol. JDF driver uses this architecture to communicate information with the system controlling production equipment. System providers also have greater flexibility in choosing message mechanisms. JDF provides a good opportunity for MIS integration

(3) JDF library and simulator

with the cooperation of Wuppertal University and Heidelberg company, the Java class library for writing and interpreting JDF has been implemented. The library will be published by CIP4 alliance, and will be made public to CIP4 members as a common resource library. Agents, controllers and devices based on this open source library can be effectively developed

figure 7

there is a Java based simulation tool at the top of the library to model the JDF workflow. This tool is also developed by Wuppertal University. Users can put JDF into the hot folder through the web interface as the output information of the simulator, and the processing information is transmitted to different production resources through JDF. These simulation resources can be processed in a single computer or as a distributed system (based on tcp/ip), When the simulator runs discrete events, the generated production status provides customers with perfect and thoughtful pre-sales service and after-sales service status, error information, etc. will be sent to the controller as work messages, and even the "real" JDF controller will be integrated into the simulation environment for testing in the future

figure 8

according to this, advanced methods for testing new agents, new controllers and new devices will be implemented, so that early testing does not need a real production environment

(4) conclusion and outlook

xml can realize the automatic transmission of data between independent computer systems. In this way, in the process of working information flow from quotation, picking up, work order arrangement, production, work order tracking, product delivery, Invoicing to collection, it reduces the complete re input of a large amount of data. The purpose of disclosing XML and JDF standards is to make the integration of workflow easier, Although we now see that these processes can only be implemented on a single provider device, such as Prinect in Heidelberg, apogee in Agfa and truenet in screen company, JDF still promises to pave the way for multiple providers to work together, but it is simple to say and difficult to do

it is difficult for us to ensure that all device providers will develop devices that adapt to the same JDF, that is, only when both systems adapt to the JDF standard can they be successfully connected. Therefore, two years ago, Creo announced the establishment of networked graphic producer (NGP). The initiating members of the organization will be committed to defining, developing, testing and providing JDF based integration between their systems. In order to ensure better integration between different providers, NGP members decided to define and use a set of standard JDF interfaces. NGP now has more than 25 members, including software providers (Adobe); MIS (DIMS!, printcafe, primac, prism, radius and streamline solutions); Digital printing provider (Xerox); Printer providers (KBA, Komori, MAN Roland and MBO)

Copyright © 2011 JIN SHI