Our clients asked us to upgrade their existing Siemens S5 system and replace it with the latest Siemens PLC. For this we used a Siemens S7-1515.
The existing SCADA package was replaced with a 19" Comfort HMI which does a great job of displaying the system overview as well as giving full control of all plant devices.
Rather than make a direct software conversion they asked us to re-write the control logic in a way that could be understood more easily by their maintenance team. This was a fantastic opportunity as the system involves multiple PIDs for the process control of their base product and a clever system for regulating slurry density.
A Pilz Multi safety PLC was already being used to manage the safety functions of the equipment so we networked this with our PLC using Profinet to read the Pilz data which gives message alerts on the HMI and shows the operator where the trip has occured.
