DPR controls have recently completed an important PLC upgrade for a well-known confectionery company. The task set was to replace four obsolete Siemens S5 units with the latest S7 controllers, whilst keeping the plant in production and all within a tight four week window. From placement of order to completion of the installation, in the end, took less than three weeks. Each of the four production lines was out of service for less than 8 hours, whilst the old PLC was removed and the new fitted and commissioned. A speedy and painless upgrade means this customer can relax knowing their control system is up to date and fully supportable.