Table 4: Communications bus and supply power terminal blocks, functions, ratings, requirements, and cables
Terminal block/
Port label
Terminal
labels
Function, electrical ratings/Requirements Recommended cable type
HOT
24 VAC Power Supply - Hot
Supplies 20–30 VAC (Nominal 24 VAC)
24~
COM
24 VAC Power Supply Common (Isolated from all other
Common terminals on controller)
35 VA
0.8 mm to 1.0 mm
(18 AWG) 2-wire
Note: The SA Bus and FC Bus wiring
recommendations in this table are for MS/TP
bus communications at 38.4k baud. For more
information, refer to the MS/TP Communications
Bus Technical Bulletin (LIT-12011034) for detailed
information about wire size and cable length
requirements for the SA and FC buses.
Metasys System FEC1611 and FEC1621 Field Equipment Controller Installation Guide 9
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