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The SA/FC bus port connects internally to the SA/FC bus terminal block. See Figure 6 for more information. The
SA/FC bus port pin assignment is also 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 upper-right of the controller.
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. See Table 6 for more
information about the supply terminal block.
Note: The supply power wire colors may differ on transformers from other manufacturers. Refer to the transformer
manufacturer's instructions and project installation drawings for wiring details.
IMPORTANT: Connect 24 VAC supply power to the controller and all other network devices so that transformer
phasing is uniform across the network devices. Powering network devices with uniform 24 VAC supply power
phasing reduces noise, interference, and ground loop problems. The controller does not require an earth ground
connection.
Figure 6:
Pin number assignments for sensor,
SA bus, and FC bus ports on controllers
Power (15 VDC)
Bus and Power Common
Power (15 VDC)
Bus and Power Common
SA or FC Bus
SA or FC Bus +
Figure 7:
Disconnect supply power to controller by unplugging
Supply Power Plug from Supply Power Jack.
Supply Power
Terminal Block
Jack
Wires from
Johnson Controls
24 VAC, Class 2
Power Transformer
PEAK® IOM57 Input/Output Modules Installation Instructions
Sensor, SA Bus, or FC Bus Port
(RJ-12 Modular Jack)
6
5
4
3
2
-
1
24 VAC supply power terminal
block wiring
24V~
Supply Power
Terminal Block
Brown Wire
Orange Wire
(COM)
(24 VAC)
7
Plug
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