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General-Purpose
Switch/Relay Modules
SCXI-1160
SCXI-1161
16 independent SPDT latching relays
Switch, route, and control low-level
and power signals
Low on-resistance and low thermal
offset for high signal integrity
Switching capacity
2 A at 250 V
rms
2 A at 30 VDC
Convenient field connections with
SCXI-1324 terminal block
Voltage installation category II
8 independent SPDT nonlatching relays
Switching capacity
8 A at 125 V
rms
6 A at 250 V
rms
5 A at 30 VDC
Screw terminals for convenient
field connections
Application Software
LabVIEW
Measurement Studio
IVI-compliant instrument driver
Windows 2000/NT/Me/9x
Solutions
Production test and ATE
Switching high power signals
Automotive test
Module
Function
Description
Switching Specifications
2 A at 250 V
rms
EXPRESS
CODES
SCXI-1160
General purpose
16-channel, SPDT mechanical relay
2 A at 30 VDC
0.6 A at 48 VDC
8 A at 125 V
rms
For information or to
buy products online,
visit ni.com/catalog
and enter:
SCXI-1161
General purpose
8-channel, SPDT mechanical relay
6 A at 250 V
rms
5 A at 30 VDC
Table 1. SCXI-1160 and SCXI-1161 Switch Specifications
(see page 453 for detailed specifications)
scxi1160
scxi1161
Overview
The National Instruments SCXI-1160 and SCXI-1161 are general-
purpose switching modules. The SCXI-1160 has 16 independent SPDT
(also called Form C) latching relays with very low on-resistance and
low thermal offset. With power capabilities of up to 2 A at 250 V
rms
or
30 VDC, these relays are suitable for switching, routing, and
controlling medium-level signals. The SCXI-1161 has eight
independent SPDT nonlatching relays. They can switch up to 8 A at
125 V
rms
, 6 A at 250 V
rms
, or 5 A at 30 VDC, making them suitable for
higher power applications. Each channel on both modules has a
normally closed (NC), normally open (NO), and common (COM)
terminal. You can use two or more SCXI-1160s and SCXI-1161s in one
or more chassis to switch and control up to thousands of signals.
Applications
The SCXI-1160 and SCXI-1161 are well suited
for general-purpose signal switching or device
activation. For example, you can use them to
control external devices such as motors,
lamps, or heaters. With the SCXI-1161, you
can switch larger signals, beyond the
capabilities of the SCXI-1160.
Relay Channels
The SCXI-1160 and SCXI-1161 have independent SPDT (Form C) relays
with three signal connections at the front of each relay – NO, NC, and
COM. The SCXI-1160 has latching relays, so they maintain their state
on power-down. The SCXI-1161 has nonlatching relays, so they return
to the NC position on power-down. The SCXI-1160/1161 relays are
break-before-make relays, when operated within the specified
switching speed.
Description
Figure 1 is a block diagram of the SCXI-1160 and SCXI-1161. The major
functions of the module are described in the following paragraphs.
National Instruments
Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com
439
General-Purpose
Switch/Relay Modules
Software
All National Instruments switch modules are shipped with NI-SWITCH
software. NI-SWITCH is an IVI-compliant instrument driver that exports
the complete functionality of the switches through an easy-to-use
interface. The instrument driver API is interchangeable with equivalent
National Instruments switch modules to ensure a scaleable system
design where you can reuse the software between systems. The driver
works with National Instruments LabVIEW and Measurement Studio,
and Microsoft Visual Basic and Visual C++.
On either module, you can set or reset each relay without affecting
the other relays, or all relays can change state at the same time. Each
relay is fully isolated for a working common-mode voltage of 250 V
rms
.
The relay contacts have no access to the analog backplane of the SCXI
chassis, therefore the backplane is protected from high voltages
present at the contacts.
SCXI-1160 and SCXI-1161 Relay Control
To complete your switching system, you will need to select the
appropriate switch controller. Please refer to the selection guide and
accessory descriptions in the Switch Accessory and Cable section on
page 443.
See page 453 for detailed specifications.
SCXI-1160
Relays 0 - 15
SCXI-1161
Relays 0 - 7
Ordering Information
SCXI-1160
.................................................776572-60
SCXI-1161
.................................................776572-61
Includes switch module and NI-SWITCH instrument driver
NC(0)
COM(0)
NO(0)
Status
Register
NC(1)
COM(1)
NO(1)
Extended warranty
and value added services
........................page 880
Data
Register
SCXI
Interface
Component Locations
for Protection Circuitry
NC(15)
COM(15)
NO(15)
See page 443 for accessory and cable options.
Single-Pole
Double-Throw Relay
Figure 1. SCXI-1160 and SCXI-1161 Block Diagram
Signal Connections
For the SCXI-1160, field signals connect to screw terminals located in
the SCXI-1324 shielded terminal block, which plugs into the SCXI-1160
front signal connector. The SCXI-1324 has individual terminals for NC,
NO, and COM connections for each relay.
For the SCXI-1161, field signals connect to screw terminals located
inside the module itself. Thus, you do not need a separate terminal
block. The SCXI-1161 has individual screw terminals for NC, NO, and
COM for each relay.
For systems requiring TBX DIN-rail mountable terminal blocks, you can
use the TBX-24F feed-through terminal blocks for either SCXI module.
See the terminal block descriptions in the Switch Accessory section for
more details.
Compatible
Terminal Block
Type
Cabling
Page
Modules
Screw terminals
SCXI-1324
SCXI-1160
–
445
front-mounting
Table 2. Terminal Block Options for SCXI-1160 and SCXI-1161
440
National Instruments
Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com
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