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In this application, Meridian was used to control the production of various household liquid chemical products. The existing system consisted of an Allen-Bradley PLC 5 with two Panel Views and a PC running SCADA software. The main reason for updating the system was to increase its usability and flexibility, and to implement a facility for communicating with the factory's inventory and management software package.
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Meridian was installed on a three PC network, communicating with the Allen-Bradley PLC 5 via two Data Highway+ links. The dual DH+ links provided redundancy to the PLC, while the network provided file server redundancy. An additional remote input/output rack was also installed to accommodate extra valves and motors that were fitted at the time of installation. .
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