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1、Application Case HistoryApplication Case HistoryLegacy processors upgraded with new, networked PLC systemThis successful food retailer employs over 56,000 employees and has more than 300 supermarkets, including a growing number of large (70,000 sq. ft.) gourmet stores in major metropolitan areas, ov
2、er 80 smaller (24,000- 30,000 sq. ft.) stores, and a number of upscale and discount stores in Mexico. The company processes some of its own meat, dairy products, bread, and tortillas. ApplicationIn 2002, the companys dairy plant had many legacy ModiconCompact processors as well as third part PLCs. A
3、ny changes, monitoring or troubleshooting of the PLCs was done locally. The milk plant maintenance supervisor needed to be able to control every PLC in the plant from a centralized location. By networking the PLCs, the maintenance department could monitor and troubleshoot their PLCs without leaving
4、the maintenance shop and better prepare themselves to fix any problems locally. They could see machine downtime, alarms, and machines operating hours, all vital information needed to better maintain their machinery. They also needed automatic control of their complex conveying system, which was manu
5、ally and locally controlled at the VSD (variable speed drives) control panel. The conveying system needed to be automatically controlled to adjust to changes upstream and downstream of the production line.Objective Tie all the PLCs controlling dairy producing machinery into a single network Automate
6、 control of their conveying systemINDUSTRY Food & BeverageOBJECTIVE Install and network plant PLCs from one vendor Automate the conveyor systemSOLUTION ModiconQuantum PLC with FactoryCast module ModiconCompact PLCs Modbus Plus network ProWORX NxTsoftwareBENEFIT All PLC systems can now be viewed, con
7、trolled, and monitored from a centralized location All the PLCs are Modicon Compact PLC programmed with ProWORX NxT Maintenance personnel needed to be trained on just one PLC system and programming software Conveying system is now automatically controlled 2005 Schneider Electric All Rights Reserved3
8、-05Schneider Electric - North American Operating Division1415 S. Roselle Road Palatine, IL 60067 Tel: 847-397-2600 Fax: 847-925-75008000AC0529SolutionPuffer-Sweiven of Houston, TX proposed and designed the Schneider Electric solution that included the Modbus Plus network. They provided the company w
9、ith an overall plan to implement the control and communication upgrade. By having the network drawing of their facility, the company was able to visualize the whole control system and successfully implement the upgrade of their PLCs and new network system. In the process of implementing this design
10、Puffer-Sweiven replaced many legacy Modicon Compact processors as well as the third party PLCs with the newer Compact 32 bit processors with Modbus Plus and I/O. The company was able to use the Modbus Plus ports on the CPU to tie them into the Modbus Plus plant network via Ruggedized Modbus Plus tap
11、s and pre-molded Modbus Plus drop cables. The third party program was converted using ProWORX NxTprogramming software. Also needed was automatic control of their conveying system, which had previously been manually and locally controlled. Puffer-Sweivens design included a ModiconQuantum PLC with a F
12、actoryCast module, which was used as the master PLC communicating to the other remote PLCs. The module communicated with the variable speed drives (VSD) controlling the production areas conveyor system. The VSDs were controlled from the FactoryCast module via Ethernet to Modbusbridges using Modbus T
13、CP/IP located at the VSD panel. BenefitThe benefits are many: All PLC systems can now be viewed, controlled, and monitored from a centralized location All the PLCs are Modicon Compact PLC programmed with ProWORX NxT The customer only needs to train their maintenance department on one PLC system and programming software The conveying system is now automatically controlled All products are supported by Puffer-Sweiven The customer is now using and aware of Schneider Electric Ethernet products
