Control and alarm architecture
The PXF4APY2-1W100: Control Output 1 is a voltage output (P). That means the primary control signal is a DC voltage level — typical for driving a solid-state relay, a valve positioner, or an analog input on a downstream drive. Control Output 2 is not populated (Y = None), so this variant dedicates the second slot to nothing; if your BOM calls for a second analog or discrete output, this is not the right option code. The alarm output is a single point (1) — a dry-contact or open-collector closure on a process-high or process-low event, not a multi-relay annunciator.