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In the installation manual (Rev W) page 57 there are examples using the two STO enable inputs. These don't show any connection to STO +24V and STO GND. They may be assumed, but the ordinary 24V IS shown.

The connection diagram on page 89 shows the STO +24V and STO GND connected, but not the enables!  Which is correct, or are they alternatives?

Thanks, John.