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Note: The SA PWR/SHLD terminal does not supply 15 VDC. The SA PWR/SHLD terminal is
isolated and can be used to connect (daisy chain) the 15 VDC power leads on the SA bus
(Figure 5) or the cable shields on the FC bus (Figure 4). The SA bus supervisor supplies 15 VDC
to devices on the SA bus requiring power.
SA/FC bus port
The SA/FC bus port on the front of the expansion module is an RJ-12, 6-position modular jack that
provides a connection for devices on the SA bus, a Bluetooth
ZFR/ZFR Pro Wireless Router (depending on which wireless system the FX-PCX is operating on).
The SA/FC bus port is connected internally to the SA/FC bus terminal block. See Table 5 for more
information. The SA/FC bus Port pin assignment is shown in Figure 6.
Supply power terminal block
The 24 VAC supply power terminal block is a gray, removable, 3-terminal plug that fits into a board-
mounted jack on the top right of the expansion module.
Wire the 24 VAC supply power wires from the transformer to the HOT and COM terminals on the
terminal plug as shown in Figure 7. The middle terminal on the supply power terminal block is not
used.
Figure 5: SA bus terminal block wiring
Figure 6: Pin number assignments for sensor,
SA bus and FC bus ports on expansion modules
FX-PCX2721 Expansion Input/Output Module Installation Instructions
Commissioning Converter, or an FX-
®
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