15 differences between MES in process and discrete manufacturing enterprises (Part 2)

8、 Production process

In the production process of the process industry , Will produce a variety of CO products 、 By-product 、 waste 、 Reflux, etc , Strict batch number is needed for material management . for example , The production process of drugs in pharmaceutical industry requires very strict batch number record and tracking , From raw materials 、 supplier 、 Intermediate products and products sold to users , All need to be recorded .

9、 Equipment management

The products in the process industry are relatively fixed , And once it is produced, it may remain unchanged for more than ten years ; Machinery manufacturing and other industries , Life expectancy is much smaller . It's reflected in the device , The equipment of a process enterprise is a fixed line The production line , Equipment investment is relatively large 、 The process is fixed . Its production capacity is limited to a certain extent , Equipment maintenance on the production line is particularly important , There can't be a breakdown . Discrete processing is not like this , A single device can be used stop To overhaul , It doesn't affect the production of the whole system .

10、 Data acquisition

MES Data acquisition function of , It can collect all kinds of data on the production site 、 Sorting out the work , It's material tracking 、 Production plan 、 Product history maintenance and other basis of production management . Automation in the process manufacturing industry There is a high degree of urbanization , The equipment control level is widely used DCS、PLC. In terms of detection drive , All kinds of intelligent instruments 、 Digital sensors have been widely used ; Process control is widely used to 、 Automatic control system based on minicomputer .

11、 Job scheduling

Products of process enterprises , It's organized as a flow line 、 Continuous mode of production , There is only a continuous process , There is no strict process route corresponding to discrete enterprises . therefore , In the aspect of job scheduling , It doesn't need and can't be accurate to the process level , Instead, the whole production line is used as a unit for scheduling . From the function and Realization of operation plan , It's simpler than a discrete enterprise .

Production planning of discrete enterprises Dispatch , It needs to be based on priority 、 Work center capability 、 Equipment capacity 、 Balanced production and other aspects of the process level 、 Equipment level job scheduling . This kind of scheduling , Is based on limited capacity Scheduling and by considering production The crisscross in the world 、 Overlap and parallel operation to accurately calculate the start time of the operation 、 Completion time 、 Time to prepare 、 Queuing time and moving time . Through good work sequence , Can significantly improve production efficiency .

12、 In terms of processing

Production completion report of process production industry , Recoil treatment is widely used . Generally, the completion reporting point is set at the end of the process , The previous process flow is recoiled , Such as the backflush of labor hours 、 Equipment man hour recoil 、 matter Material recoil , So as to track WIP and cost .

Completion report in discrete manufacturing , Generally, every process should be reported , Or set recoil point in key process , Recoil the previous process .MES System When configuring corresponding modules , Pay attention to these differences , To meet the needs of the enterprise .

13、 The issue of work instructions

In the process industry MES in , It's not just about giving orders and PDI（Panel Data Interface, Panel data interface ） data , Moreover, it is necessary to convert the operation instructions into the operation instructions of each unit and equipment and the control parameters of various basic automation equipment （ for example PID Control parameter ——Proportional Integral Derivative, Than Example: integrodifferential control ）, And send it to the corresponding PCS System （Production Control System, Production control system ）.

In discrete industries MES in , Generally, dispatching order is used to release the scheduling results to the operators 、 Notice in written form such as construction order , Or use electronic Kanban to let operators master the production tasks of relevant processes in time . The content of the work plan , Including the start of the process 、 Completion time 、 Production data, etc .

14、 Quality management

Quality inspection and management are very important in both discrete and process industries , But in MES There are some differences in the way of quality inspection and management . In the process industry , In general, the production batch number of products is used for each Sampling inspection in process . In discrete industries , For single piece and small batch production , It is generally necessary to inspect each part 、 The processing quality of each process ; For mass production , Generally, the first inspection is adopted 、 Spot check 、SPC A combination of analysis .

15、 Warehouse material management

In the process industry , For continuous production mode , Generally, there is no warehouse for intermediate and semi-finished products , The warehouse location of formula raw materials is generally set next to the process . Formula picking is not based on process picking , Instead, according to the production plan, the material is picked up at one time and placed in the process warehouse . In discrete industries , Generally, there are corresponding warehouses for semi-finished products , Each process is based on the production operation The plan and the supporting list are used for picking materials respectively .

All in all , Different production methods and types in each industry （ For example, single piece small batch or mass production in discrete industries , In medicine 、 chemical 、 Steel and other industries with different processes ）,MES There are still some differences in the application of , We still need to make a comprehensive analysis according to their respective characteristics , stay MES The specific implementation of the system , We should treat them differently according to the characteristics of the industry .

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