Johnson Controls IOM3733, Installation Instructions Manual, Page: 2 / 16

Physical features
The following figure displays the physical features
of the IOM, and the accompanying table provides a
description of the physical features and a reference
to further information where required.
Figure 1: IOM3733 physical features
Table 1: IOM3733 feature callouts and
descriptions
Callo
ut
Physical feature: description and references
1 Binary Output (BO) Terminal Block (see Table 2)
2 Mounting Clip (Three Total) (see Figure 1)
3 Device Address DIP Switch Block (see )
4
24 VAC, Class 2 Supply Power Terminal Block (see Supply
Power Terminal Block )
5
Cover Lift Tab (One of Two) (see Removing the expansion
module cover )
6
Sensor Actuator (SA) Bus / Field Controller (FC) Bus
Terminal Block (see SA/FC bus terminal block )
7
End-of-Line (EOL) Termination Switch (see Setting the
End-of-Line (EOL) switch )
8 Binary Input (BI) Terminal Block (see Table 2)
9 LED Status Indicators
Mounting
Observe these guidelines when mounting a
controller.
• Ensure the mounting surface can support the
controller, DIN rail, and any user-supplied
enclosure.
• Mount the controller horizontally on 35 mm DIN
rail whenever possible.
• Mount the controller in the proper mounting
position.
• Mount the controller on a hard, even surface
whenever possible in wall-mount applications.
• Use shims or washers to mount the controller
securely and evenly on the mounting surface.
• Mount the controller in an area free of corrosive
vapors and observe the Ambient Conditions
requirements in Technical specifications .
• Provide for sufficient space around the controller
for cable and wire connections for easy cover
removal and good ventilation through the
controller (50 mm [2 in.] minimum on the top,
bottom, and front of the controller).
• Do not mount the controller on surfaces prone to
vibration, such as duct work.
• Do not mount the controller in areas where
electromagnetic emissions from other
devices or wiring can interfere with controller
communication.
IOM3733 Input/Output Module Installation Guide 2