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For detailed information on configuring and wiring an MS/TP bus, FC bus, and SA bus, refer to
the FX-PC Series Controllers MS/TP Communications Bus Technical Bulletin (LIT-12011670) or MS/TP
Communications Bus for BCPro System Technical Bulletin (LIT-12011908).
Terminal blocks and bus ports
See Figure 3 for terminal block and bus port locations on the expansion module. Observe the
following guidelines when wiring an expansion module.
Input and output terminal blocks
The input terminal blocks are mounted on the bottom of the expansion module and the output
terminal blocks are mounted on the top of the expansion module. See Table 3 for more information
about I/O terminal functions, requirements, and ratings.
SA/FC bus terminal block
An FX-PCX expansion module can be connected to a Sensor/Actuator (SA) bus or a Field Controller
(FC) bus, but not to both buses simultaneously. The SA/FC bus terminal block is a removable, 4-
terminal plug that fits into a board-mounted jack.
When connecting the FX-PCX to an FC bus, wire the bus terminal block plugs on the expansion
module, and the other controllers and expansion modules in a daisy-chain configuration using 3-
wire twisted, shielded cable as shown in Figure 4.
Figure 4: FC bus terminal block wiring
When connecting the FX-PCX to an SA bus, wire the bus terminal block plugs on the expansion
module and other SA bus devices in a daisy-chain configuration using 4-wire twisted, shielded cable
as shown in Figure 5.
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FX-PCX2721 Expansion Input/Output Module Installation Instructions
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