Johnson Controls IOM3711 Installation Instructions Manual page 16

Table 6: SA/FC Bus Device Address Descriptions
Device Use on Description
Address
0 to 3 Reserved addresses for wired slave devices
(not for use on controllers).
(Switch
128 ON) Note: Metasys field controllers ship with
switch 128 ON and the remaining
address switches off rendering the
controllers wired slave devices, which
do not operate on MS/TP buses.
4 to 127 Valid for MS/TP Master controllers on wireless
FC Buses only.
(Switch
128 ON) Note: Do not connect a controller with
switch 128 ON to an active
(hard-wired) SA or FC bus. When a
controller with switch 128 ON and a
device address from 4 to 127 is
connected to a wired field bus, the
entire bus is rendered inoperable until
the controller is disconnected or
switch 128 is set to Off.
Removing the Expansion Module
Cover
Important: Electrostatic discharge can damage
expansion module components. Use proper
electrostatic discharge precautions during
installation, setup, and servicing to avoid
damaging the expansion module.
Important: Disconnect all power sources to the
expansion module before removing cover
and changing the position of any jumper or
the EOL switch on the expansion module.
Failure to disconnect power before changing
a jumper or EOL switch position can result
in damage to the expansion module and
void any warranties.
The expansion module cover is held in place by four
plastic latches that extend from the base and snap into
slots on the inside of the housing cover.
To remove the expansion module cover:
1. Place your fingernails under the two cover lift tabs
(Figure 3) on the sides of the housing cover and
gently pry the top of the cover away from the base to
release the cover from the two upper latches.
2. Pivot the top of the cover further to release it from the
lower two latches.
IOM3711 Input/Output Module Installation Instructions
3. Replace the cover by placing it squarely over the
base, and then gently and evenly push the cover on
to the latches until they snap into the latched position.
Figure 10: IOM37 with Cover Removed Showing EOL
Switch Location
Setting the End-of-Line (EOL) Switch
Each expansion module has an EOL switch, which, when
set to ON, sets the expansion module as a terminating
device on the bus. See
location. The default EOL switch position is Off.
Figure 11: End-of-Line Switch Positions
To set the EOL switch on a expansion module:
1. Determine the physical location of the expansion
module on the SA or FC bus.
2. Determine if the expansion module must be set as a
terminating device on the bus.
Note: The EOL termination rules for SA buses and
FC buses are different. Refer to the MS/TP
Communications Bus Technical Bulletin
(LIT-12011034) for detailed information
regarding EOL termination rules and EOL
switch settings on SA and FC buses.
3. If the expansion module is a terminating device on
the FC bus, set the EOL switch to ON. If the
expansion module is not a terminating device on the
bus, set the EOL switch to Off.
Figure 10 for the EOL switch
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