You can accomplish what you need in HAL or ClassicLadder. For each
axis, there is a pin axis.N.homing which is TRUE when the joint is
homing. You can use these together with the single input signal to get
the "limit" signal. In "C"-like notation, this would be
on_limit = switch_input && !(axis_0_homing || axis_1_homing ||
axis_2_homing)
This configuration is undesirable, because if some bug causes motion on
one axis while another is homing, it won't be detectable within emc.
Jeff
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