2
FLEX I/O 8 Relay Output Module
Publication 1794-IN019E-EN-P - May 2009
North American Hazardous Location Approval
The 1794-OW8, 1794-OW8K, 1794-OW8XT modules are Hazardous
Location approved.
Installing Your Relay Output Module
The module mounts on a 1794 terminal base.
1.
Rotate the keyswitch (1) on the terminal base (2) clockwise to
position 9 as required for this type of module.
2.
Make certain the flexbus connector (3) is pushed all the way to the
left to connect with the neighboring termbase/adapter.
You
cannot install the module unless the connector is fully
extended.
3.
Make sure the pins on the bottom of the module are straight so
they will align properly with the connector in the terminal base.
4.
Position the module (4) with its alignment bar (5) aligned with the
groove (6) on the terminal base.
5.
Press firmly and evenly to seat the module in the terminal base
unit. The module is seated when the latching mechanism (7) is
locked into the module.
Simplified Schematic of the Relay Module
Load power can be obtained from a variety of sources, and can range from
+5V to 240V AC. Make certain that only 24V DC is applied to the module
power terminals on the module terminal base unit.
If you are using 220/240V AC power, you must use the 1794-TBN or -TBNF
terminal base unit. Maximum voltage allowed is shown below.
Working Voltage and Isolation Voltage Ratings
Wiring to a 1794-TB2, -TB3 or -TB3S Terminal Base Unit
1.
Connect individual output relay contact (customer load) wiring to
numbered terminals on the
0-15
row
(A)
as indicated in the table
below. The even numbered terminals are one pole of the relay
contacts; the odd numbered terminals are the other pole of the
relay contacts.
2.
Connect 24V DC return to terminal 16 on the
16-33
row
(B)
.
3.
C24V DC power to terminal 34 on the
34-51
row
(C)
.
The following information applies when operating this
equipment in hazardous locations:
Informations sur l’utilisation de cet équipement en
environnements dangereux :
Products marked “CL I, DIV 2, GP A, B, C, D” are suitable for
use in Class I Division 2 Groups A, B, C, D, Hazardous
Locations and nonhazardous locations only. Each product is
supplied with markings on the rating nameplate indicating the
hazardous location temperature code. When combining
products within a system, the most adverse temperature code
(lowest “T” number) may be used to help determine the
overall temperature code of the system. Combinations of
equipment in your system are subject to investigation by the
local Authority Having Jurisdiction at the time of installation.
Les produits marqués "CL I, DIV 2, GP A, B, C, D" ne conviennent
qu’à une utilisation en environnements de Classe I Division 2
Groupes A, B, C, D dangereux et non dangereux. Chaque produit
est livré avec des marquages sur sa plaque d’identification qui
indiquent le code de température pour les environnements
dangereux. Lorsque plusieurs produits sont combinés dans un
système, le code de température le plus défavorable (code de
température le plus faible) peut être utilisé pour déterminer le
code de température global du système. Les combinaisons
d’équipements dans le système sont sujettes à inspection par
les autorités locales qualifiées au moment de l’installation.
WARNING
EXPLOSION HAZARD
• Do not disconnect equipment
unless power has been removed or
the area is known to be
nonhazardous.
• Do not disconnect connections to
this equipment unless power has
been removed or the area is known
to be nonhazardous. Secure any
external connections that mate to
this equipment by using screws,
sliding latches, threaded
connectors, or other means
provided with this product.
• Substitution of components may
impair suitability for Class I,
Division 2.
• If this product contains batteries,
they must only be changed in an
area known to be nonhazardous.
AVERTISSEMENT
RISQUE D’EXPLOSION
• Couper le courant ou s’assurer que
l’environnement est classé non
dangereux avant de débrancher
l'équipement.
• Couper le courant ou s'assurer que
l’environnement est classé non
dangereux avant de débrancher les
connecteurs. Fixer tous les
connecteurs externes reliés à cet
équipement à l'aide de vis, loquets
coulissants, connecteurs filetés ou
autres moyens fournis avec ce
produit.
• La substitution de composants peut
rendre cet équipement inadapté à
une utilisation en environnement de
Classe I, Division 2.
• S’assurer que l’environnement est
classé non dangereux avant de
changer les piles.
ATTENTION
During mounting of all devices, be sure that all debris (for example, metal chips
and wire strands) is kept from falling into the module. Debris that falls into the
module could cause damage on power up.
ATTENTION
Allow 25.4 mm (1 in.) of space between adjacent equipment for adequate
ventilation.
WARNING
If you remove or insert the module while the backplane power is on, an
electrical arc can occur. This could cause an explosion in hazardous location
installations. Be sure that power is removed or the area is nonhazardous before
proceeding.
1
2
3
4
5
6
7
Terminal Base 1794-
24V
120V
230V
Isolation Voltage
TBN, TBNK, TBNF, TBNFK
AC/DC
AC/DC
AC/DC
Dependent upon installed
module - refer to individual
installation instructions for your
specific module.
TB2, TB3, TB3K, TB3S
AC/DC
AC/DC
TB3T, TB3TS
AC/DC
AC/DC
TB3G, TB3GK, TB3GS
AC/DC
TB32, TB32S
AC/DC
TBKD
DC
AC
ATTENTION
If multiple power sources are used, do not exceed the specified isolation
voltage.
ATTENTION
Apply only 24V DC power to the power terminals on the terminal base
unit.
Make certain that
all
relay wiring is properly connected before applying any
power to the module.
ATTENTION
Total current through the terminal base unit is limited to 10A. Separate power
connections to the terminal base unit may be necessary.
ATTENTION
Do not attempt to increase load current or wattage capability beyond the
maximum rating by connecting 2 or more outputs in parallel. The slightest
variation in relay switching time may cause one relay to momentarily switch the
total load current.
Relay Load Contact Wiring
dc
Return
+24V
dc
24V
dc
48V
dc
120V
ac
240V
ac
125V
dc
24V
dc
120V
ac
240V
ac
Representative Examples of Various Relay Loads