Nevermind, I'm a dummy. Hoping to finish this up by the end of the year. If I forget to post again in the future give me a buzz - hopefully I can put a BOM, source code for the controller and diagrams up.
S1 - Close mould [high pressure clamp adjust]
S2 - Lock mould [high pressure clamp adjust]
S3 - Open injection nozzle
S4 - Injection unit (screw?) forward
S5 - Injection unit (screw?) backward
S6 - Mould open [high or low pressure clamp adjust]
S15 - Ejector
S16 - Decompression (hydraulic screw retraction... this was in German, I think it's referring to the ejector - will have to see)
S17 - Mould close [low pressure clamp adjust]
S18 - Injection pressure adjust (toggles between main and secondary injection pressure)
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S1 closes the clamp with more speed/force than S17. Whichever you use depends on the amount of clamp pressure you want.