Channel Connections - National Instruments ER-8 User Manual

Chapter 3
Current requirements for the ER-8/16 are as follows:
If you use its internal +5 V supply setting, make sure your device can supply the required amount
of +5 V power to the ER-8/16.
Note: DIO-32F boards do not provide internal +5 V supply. You will need an external +5 V
supply for DIO-32F boards.
DAQCard-DIO-24 and other DAQCards can provide a maximum of 500 mA of
current. You can drive only one ER-8 with the internal supply. You will need an
external +5 V supply for driving more than eight channels.
In addition to the above note, refer to Figures 3-3 and 3-4 for information on configurations that
require an external +5 V supply.
When you connect more than one ER-8 with any of the SC-205X Series cable adapters, you will
need an external +5 V power supply.
Warning:
Connecting the cable to the wrong connector can damage the ER-8/16 or your
DAQ device. National Instruments is
such connections.
Use and connect only one of the following connectors when operating the
ER-8/16: the DIO-24, DIO-32, or IN connector. National Instruments is
liable for any damages resulting from incorrect connections.
If you use your DAQ device's internal +5 V supply, make sure that the power supply switch
(SW1) is set to the INT position. If you are using an external +5 V supply, make sure that SW1
is set to the EXT position. Refer to Figure 2-1 for the location of the SW1 switch.
Note: By default, your ER-8/16 is shipped with SW1 set to the EXT position.

Channel Connections

The ER-8/16 has 26 screw terminals. Twenty-four of these screw terminals are for connecting
the loads to the relay channels and two screw terminals are for providing the external +5 V
supply to the unit. Each channel consists of a COM position, an NC position, and an NO
position.
© National Instruments Corporation
Channels Current (Amps)
8 0.5 A
16 1.0 A
24 1.5 A
32 2.0 A
liable for any damages resulting from
NOT
3-3
Signal Connections
NOT
ER-8/16 User Manual