Made a rough start but im not sure if its correct.. http://imgur.com/a/Y6yr3
The question is
"At switch on the system must be reset and a heater is started to heat the base solution."
"When the set point temperature is reached the heater will switch off and a conveyor system, on which the mixing elements are situated, is switched on."
"Once six mixing elements have been despatched into the base solution the conveyor system must stop and a 30 second delay must elapse to allow the mixing elements to dissolve completely."
So far i think I've managed to start the conveyor