Table 2-1. Parts Locator Diagram Descriptions - National Instruments ER-8 User Manual

Chapter 2
Callout Name
1 Power LED
2 SW1
3 Channel 1 LED
4 Channel 1 Relay
5 Screw Terminals
6 Surge Protector Pads
7 J8
8 J3
9 Fuses
10 J2
11 J1
© National Instruments Corporation

Table 2-1. Parts Locator Diagram Descriptions

Description
When illuminated red, this LED indicates that the ER-8/16
is receiving power.
This is the main +5 V power supply switch for selecting
external or internal supply. Move the switch to EXT if
using external supply and to INT if using internal (driving
device or ER-16) supply. By default, your ER-8/16 is
shipped with SW1 in the EXT position.
These DS<1..16> LEDs are illuminated green when the NO
contact is shorted to the COM contact for the respective
channel. Otherwise the LED is shut off.
These K<1..16> relays are controlled digitally on the
ER-8/16.
The NC<1..16> screw terminals are for the NC contact for
channels 1 through 16.
The NO<1..16> screw terminals are for the NO contact for
channels 1 through 16.
The COM<1..16> screw terminals are for the COM contact
for the channels 1 through 16.
The M<1..16> pads across NC and COM contacts are for
protecting the relay contacts from inductive loads. A
resistor and capacitor combination can be placed across
these pads to suppress sparking on the relay contacts due to
inductive loads.
The N<1..16> pads across NO and COM contacts are for
protecting the relay contacts from inductive loads. A
resistor and capacitor combination can be placed across
these pads to suppress sparking on the relay contacts due to
inductive loads.
This external power-supply connector, EXT +5 V, is for
external +5 V supply. EXT GND is the reference for the
external +5 V supply, and is connected to the ER-8/16
ground.
This 26-pin OUT connector sends the 26-pin daisy-chain
cable to the ER-8 or the ER-16.
F1 and F2 are socketed power supply fuses. You may
replace these fuses if they are blown. The fuse is
LIT-PICOII, 2 A, 125 V, fast.
This 26-pin IN connector receives the 26-pin daisy-chain
cable from the ER-16 or SC-205X cable adapter.
This 50-pin dual connector has the top connector for DIO-32
boards, and the bottom connector for DIO-24 devices.
2-3
Setup
ER-8/16 User Manual