Could it be one of those situations where the EStop is wired up to be "Active-high"? By this, I think I mean that a voltage signal needs to be present on the EStop for it to stop everything. The same sort of option sometimes applies to limit switch hookups, in manuals I have read. In this case, they want an active voltage to be present to signal a limit trip. Some safeguard against broken wires, huh?
To me, this seems bass ackwards, because the natural condition for EStop and for limit trip, is a no-voltage (low) condition on those safety circuits.
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