PEAK® IOM57 Input/Output Modules Installation Instructions
17
Setting the current loop jumper to the enabled position, as shown in Figure 10 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
controller is interrupted or off.
The following table identifies the current loop jumpers that are associated with each UI on the IOM5711 controller.
Setting the End-of-Line (EOL) switch
Each controller has an EOL switch, which when set to ON, sets the controller as a terminating device on the bus.
See the following figure for the EOL switch location. The default EOL switch position is Off.
To set the EOL switch on the controller, complete the following steps:
1. Determine the physical location of the controller on the SA or FC bus.
2. Determine if the controller 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 controller is a terminating device on the FC bus, set the EOL switch to ON. If the controller is not a
terminating device on the bus, set the EOL switch to Off.
When a controller is connected to power with its EOL switch set to ON, the amber EOL LED on the controller
cover lights up.
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 8: IOM5711 UI inputs and jumper labels
Universal input label
Jumper label on circuit board
IN1
J2
IN2
J3
IN3
J5
IN4
J6
IN5
J7
IN6
J8
IN7
J9
IN8
J10
IN9
J11
IN10
J12
IN11
J13
IN12
J14
IN13
J16
IN14
J17
IN15
J18
IN16
J19
Figure 11: End-of-Line switch positions
FI
G
:f
ec
_e
ol
_s
w
it
ch
EOL ON Position
EOL Off Position
O
N
O
N
