Johnson Controls FX-PCX3721, Руководство по установке

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Figure 8: Maximum Wire Length for Low-Voltage (<30V) Inputs and Outputs by Current and Wire Size
SA/FC Bus and Supply Power
Wiring Guidelines
Table 5 provides information about the functions, ratings,
and requirements for the FX-PCX controller
communication bus and supply power terminals; and
guidelines for wire sizes, cable types, and cable lengths
when wiring the controller communication buses and
supply power.
In addition to the guidelines in Table 5 , observe these
guidelines when wiring an SA or FC bus and the 24 VAC
supply power:
• Run all low-voltage wiring and cables separate from
high-voltage wiring.
• All SA and FC bus cables, regardless of wire size,
should be twisted, insulated, stranded copper wire.
• Shielded cable is strongly recommended for all SA
and FC bus cables.
• Refer to the FX-PC Series Controllers MS/TP
Communications Bus Technical Bulletin
(LIT-12011670)
or MS/TP Communications Bus for
BCM System Technical Bulletin (LIT-12011908) for
detailed information regarding wire size and cable
length requirements for the SA and FC buses.
8 FX-PCX3721 Expansion Input/Output Module Installation Instructions