Figure 11: End-of-Line switch positions
To set the EOL switch on an expansion module, complete
the following steps:
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.
When an expansion module is connected to
power with its EOL switch set to ON, the amber
EOL LED on the expansion module cover is lit.
UI current loop jumpers
The UI current loop fail-safe jumpers are on the circuit
board under the expansion module cover near the UI
terminals. When a UI is defined (in the system software)
as a 4 to 20 mA Analog Input and the UI’s current loop
jumper is in the Disabled (default) position (Figure 12), the
4 to 20 mA current loop circuit opens whenever power to
the expansion module is interrupted or off.
Figure 12: Current loop jumper positions
Setting the current loop jumper to the Enabled position
(Figure 12) connects an internal 100 ohm resistor across
the UI terminals, which maintains the 4 to 20 mA current
loop circuit even when power to the expansion module is
interrupted or off.
Important:
Current Loop jumpers must be in the
Disabled (default) position for all UIs that are not set
up to operate as 4 to 20 mA analog inputs.
Table 7: UI Inputs and Jumper Labels
Universal Input Label
Jumper Label on Circuit Board
Label
IN1
J20
IN2
J21
IN3
J22
IN4
J24
IN5
J25
IN6
J26
IN7
J27
IN8
J28
Commissioning
You commission expansion modules with Controller
Configuration Tool (CCT) software, using a Bluetooth
Wireless Commissioning Converter (BTCVT), through
Mobile Access Portal (MAP) Gateway at version 4.2 or
above, or in BACnet router mode when connected to a
Supervisory Controller. Refer to the
Controller Tool Help
(LIT-12011147)
for detailed information on commissioning
expansion modules.
Note:
The MAP Gateway serves as a replacement for
the BTCVT, which is no longer available for purchase,
but continues to be supported.
Troubleshooting
Observe the Status LEDs on the front of the expansion
module. Table 8 provides LED status indicator information
for troubleshooting the expansion module.
IOM2721 Input/Output Module Installation Guide
13