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SCXI 16-Channel SPDT
Relay Module
SCXI-1160
Application Software
LabVIEW
BridgeVIEW
LabWindows/CVI
LabWindows
ComponentWorks
Lookout
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 Vrms
2 A at 30 VDC
250 Vrms contact-to-coil isolation
Convenient field connections with
SCXI-1324 terminal block
NI-DAQ Software
Windows NT
Windows 95
Windows 3.1
Mac OS
DOS
Overview
The SCXI-1160 is a general-purpose relay module with 16
independent SPDT, also called Form C, latching relays. These
relays have very low on-resistance and a low thermal offset,
making them suitable for switching, routing, and controlling
low-level signals. The relays can also switch up to 2 A at
250 Vrms or 30 VDC. Each channel has a Normally Closed (NC),
Normally Open (NO), and Common (COM) terminal. You can
use several SCXI-1160 modules with a single DAQ board or
module to switch or control up to 1,536 signals or devices. The
DAQ board controls the SCXI-1160 relays through serial
communication over the SCXIbus in the backplane of an SCXI
chassis.
The SCXI-1160 is well suited for any application requiring
general-purpose signal switching or device activation. You can
use the SCXI-1160 relays to create unique switching schemes
using its high-integrity contacts. You can also use the SCXI-1160
relays to control external devices such as motors, lamps, or
heaters.
within the specified switching speed. Each relay provides three
connections at the front signal connector – Normally Open
(NO), Normally Closed (NC), and Common (COM).
You can set or reset each relay without affecting the other relays,
or all relays can change state at the same time. When a relay
switches states, it is energized for a limited period of time (20 ms
maximum), minimizing the thermal offset voltage generated across
the contacts. Each relay is fully isolated for a working common-
mode voltage of 250 Vrms. The relay contacts have no access to
the analog backplane of the SCXI chassis, so that the backplane will
be protected from high voltages present at the contacts.
Data and Status Registers
Writing digital information to the Data Register drives the
16 relays. A DAQ device, SCXI-2000, or SCXI-2400 serially writes
data to this register via the SCXIbus. In this way, you can control
several SCXI-1160 modules with a single DAQ board or module.
The Status Register has a status bit that indicates the active status
of the relays.
Description
Figure 1 is a block diagram of the SCXI-1160. The major
functions of the module are described in the following
paragraphs.
SCXI Interface
The SCXI interface circuitry interfaces the data and status registers
to the SCXIbus and rear signal connector, which you can cable
to a DAQ board. The SCXI interface includes an address handler
and a module ID register that you can read over the SCXIbus.
Communications of digital data to and from the
SCXI-1161module is implemented over the SCXIbus using digital
I/O lines of the DAQ board or module, or directly by the
SCXI-2000 or SCXI-2400. Therefore, using an SCXI system in
Relay Channels
The SCXI-1160 has 16 independent SPDT, or Form C, relays. The
relays are latching, so that they maintain their state on power-
down. The contacts are also break-before-make when operated
376
National Instruments
Phone: (512) 794-0100 • Fax: (512) 794-8411• info@natinst.com • www.natinst.com
SCXI 16-Channel SPDT
Relay Module
Relays 0 through 15
NC(0)
COM(0)
NO(0)
terminal blocks. See terminal blocks descriptions later
in this section for more information.
Status
Register
NC(1)
COM(1)
NO(1)
Connection to DAQ Device
If using SCXI with a plug-in DAQ board or PCMCIA
DAQCard, you only need to cable one SCXI module in
your chassis to the DAQ board. The SCXI-1160 is
programmed by the DAQ device serially over the
SCXIbus. If the SCXI chassis includes only digital I/O or
relay modules, you can control the system with a
single DIO-24, DIO-32HS (6533), or DIO-96 plug-in
board, SCXI-2000 chassis, or SCXI-2400 module.
Otherwise, if the system includes analog input
modules, you can control the entire SCXI system with
any MIO Series or Lab/1200 Series product.
Data
Register
SCXI
Interface
Component Locations
for Protection Circuitry
NC(15)
COM(15)
NO(15)
Double-Throw Relay
Figure 1. SCXI-1160 Block Diagram
Single-Pole
multiplexed or serial mode with a DAQ board or module will
reserve up to 4 digital output and 1 digital input lines (two ports)
of the DAQ device.
Software
NI-DAQ, the driver-level software needed to control your SCXI
modules, is shipped with the plug-in DAQ board,SCXI-1200,
SCXI-2400, or SCXI-2000.
Signal Connection
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 terminal block has an NC, NO,
and COM terminal for each relay channel.
If configuring a system with TBX DIN rail mountable terminal
blocks, you can connect signals from the SCXI-1324 terminal
block to one or two general-purpose TBX-24F feedthrough
Part Numbers
SCXI-1160 .........................................................776572-60
SCXI-1324 terminal block ..................................776573-24
Specifications
Typical for 25º C unless otherwise noted.
Low-level loads
(1 mA, 1 VDC) ............................... 50 operations/s
Relay set time....................................... 10 ms
Relay reset time.................................... 10 ms
Physical
Dimensions.......................................... 3.0 by 17.2 by 20.3 cm
(1.2 by 6.8 by 8.0 in.)
I/O connectors .................................... 50-pin male ribbon cable rear
connector 48-pin male DIN C front
I/O connector
Digital Relays
Number of relays ................................. 16
Relay type ............................................ SPDT (Form C), latching
Maximum input voltage
Channel to channel ......................... 250 Vrms
Channel to ground .......................... 250 Vrms
Maximum switching voltage
AC.................................................... 250 Vrms
DC ................................................... 48 VDC
Maximum switching capacity
AC.................................................... 2 A at 250 Vrms
DC ................................................... 2 A at 30 VDC, 0.6 A at 48 VDC
Minimum switching
capacity ........................................... 100 µA at 100 mVDC
On resistance, including
terminal block .................................. 75 m
Environment
Operating temperature........................ 0º to 50º C
Storage temperature............................ -20º to 70º C
Relative humidity ................................. 5% to 90% noncondensing
Certifications and Compliances
CE Mark Compliance
This product meets applicable EU directive(s) as follows:
Safety isolation....... .............................. Low voltage directive EN 61010
(double insulation for 250 Vrms,
installation category II)
(initial)
Contact material .................................. Gold-clad silver alloy
Expected life
Mechanical ...................................... 10
8
operations
Electrical........................................... 10
5
operations at 2 A, 250 Vrms,
2 x 10
5
operations at 2 A, 30 VDC
Thermal offset ...................................... 3 µV
Maximum operating speed
Maximum load................................. 20 operations/minute
½
EMC Directive
Immunity.......................................... EN 50082-1:1994
Emissions.......... ............................... EN 55011:1991 Group I Class A at 10 m
National Instruments
Phone: (512) 794-0100 • Fax: (512) 794-8411• info@natinst.com • www.natinst.com
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