Publication 1794-IN019E-EN-P - May 2009
4
PN-46788
Supersedes Publication 1794-IN019D-EN-P - June 2004
Copyright © 2009 Rockwell Automation, Inc. All rights reserved.
General
Attribute
Value
Outputs per module
1 group of 8 Form A isolated (normally open)
electromechanical relays
Module location
Mounts on 1794-TB2, -TB3, -TB3S, -TBN and -TBNF Terminal Base Units.
When using 1794-TBNF terminal base unit, use 3.0 A, 250V AC
slow-blow fuses (Littelfuse pt. no. 239003)
Off-State leakage
current (max at 240V AC)
1.0m A thru snubber circuit
Minimum contact load
100
μ
A at 100mV DC
Output voltage range (load
dependent)
5-30V DC @ 2.0 A resistive
125V DC @ 0.22 A resistive
125V AC @ 2.0 A resistive
240V AC @ 2.0 A resistive
If used in European Zone 2 potentially explosive atmospheres:
1794-OW8 - voltages must be at or below 60V AC or 75V DC;
1794-OW8K - voltages must be at or below all voltage ratings.
Output current rating
(at rated power)
Resistive
2 A @ 5-30V DC
0.22 A @ 125V DC
2 A @ 125V AC
2 A @ 240V AC
Inductive
0.98 A steady state @ 5-30V DC, L/R = 7ms
0.5 A steady state @ 48V DC, L/R = 7ms
0.22 A steady state @ 125V DC, L/R = 7ms
2.0 A steady state, 15A make @ 120V AC,
PF = cos
θ
= 0.35
2.0 A steady state, 7.5A make @ 240V AC,
PF = cos
θ
= 0.35
Power rating
(steady state)
250W max. for 125V AC resistive output
480W max. for 240V AC resistive output
60W max. for 30V DC resistive output
27W max. for 125V DC resistive output
180VA max. for 125V AC inductive output
180VA max. for 240V AC inductive output
27VA max. for 30V DC inductive output
27VA max. for 125V DC inductive output
Output signal delay
OFF to ON
ON to OFF
10ms maximum (time from valid output on signal to relay energization by
module)
10ms maximum (time from valid output off signal to relay deenergization
by module)
Initial contact resistance
30m
Ω
Switching frequency
1 operation/3s (0.3Hz at rated load) max
Bounce time
1.2ms (mean)
Expected life of
electrical contacts
Minimum 100,000 operations @ rated loads
Flexbus current
35 mA maximum
Power dissipation
5.5W
Thermal dissipation
18.8 BTU/hr maximum
Isolation voltage
250V (continuous), Basic Insulation Type, relay to relay, relay to
backplane, and relay to power
50V (continuous), Basic Insulation Type, power to backplane
Type tested at 1500V AC for 60 s, relay to relay, all combinations.
Type tested at 3250V DC for 60 s, relay to backplane and relay to power
Type tested at 900V DC for 60 s, power to backplane.
Fusing
Fusing of outputs is recommended. Use 3.0 A, 250V AC slow-blow fuses
(Littelfuse pt. no. 239003).
Indicators
8 yellow status indicators - show status of individual outputs. If relay
output bit is on, corresponding output indicator is on.
Keyswitch position
9
Terminal screw torque
Determined by installed terminal base
Dimensions (with module
installed)
94H x 94W x 69D mm (3.7H x 3.7W x 2.7D inches )
Enclosure
None (open-style)
Wiring category
(1)
(1)
Use this Conductor Category information for planning conductor routing. Refer to Industrial Automation Wiring and
Grounding Guidelines, publication
1770-4.1.
2 - on signal ports
Wire size
Determined by installed terminal base
Pilot Duty Rating
C300, R150
North American temp code
T4 (1794-OW8XT)
T5 (1794-OW8, 1794-OW8K)
IEC Temp Code
T4 (1794-OW8XT)
T5 (1794-OW8, 1794-OW8K)
Environmental
Attribute
Value
Operating temperature
IEC 60068-2-1 (Test Ad, Operating Cold),
IEC 60068-2-2 (Test Bd, Operating Dry Heat),
IEC 60068-2-14 (Test Nb, Operating Thermal Shock):
0…55 °C (32…131 °F) (1794-OW8, 1794-OW8K)
-20…70 °C (-4…158 °F) (1794-OW8XT)
Non-operating
temperature
IEC 60068-2-1 (Test Ab, Unpackaged Non-operating Cold),
IEC 60068-2-2 (Test Bb, Unpackaged Non-operating Dry Heat),
IEC 60068-2-14 (Test Na, Unpackaged Non-operating Thermal Shock):
-40…85 °C (-40…185 °F)
Relative humidity
IEC 60068-2-30 (Test Db, Unpackaged Damp Heat):
5…95% noncondensing
Vibration
IEC 60068-2-6 (Test Fc, Operating):
5 g @ 10…500 Hz
Operating shock
IEC 60068-2-27 (Test Ea, Unpackaged Shock):
12 g
Non-operating shock
IEC 60068-2-27 (Test Ea, Unpackaged Shock):
50 g
Emissions
CISPR 11:
Group 1, Class A
ESD immunity
IEC 61000-4-2:
6 kV contact discharges
8 kV air discharges
Radiated RF immunity
IEC 61000-4-3:
10V/m with 1 kHz sine-wave 80% AM from 80…2000 MHz
10V/m with 200 Hz 50% Pulse 100% AM at 900 MHz
10V/m with 200 Hz 50% Pulse 100% AM at 1890 MHz
3V/m with 1 kHz sine-wave 80% AM from 2000…2700 MHz
EFT/B immunity
IEC 61000-4-4:
±2 kV at 5 kHz on signal ports
Surge transient
immunity
IEC 61000-4-5:
±1 kV line-line(DM) and ±2 kV line-earth(CM) on signal ports
Conducted RF immunity
IEC 61000-4-6:
10V rms with 1 kHz sine-wave 80% AM from 150 kHz…80 MHz
Certifications (when product is marked)
(1)
(1)
See the Product Certification link at
http://www.ab.com
for Declaration of Conformity, Certificates, and other
certification details.
Attribute
Value
c-UL-us
UL Listed Industrial Control Equipment, certified for US and Canada. See UL File
E65584.
UL Listed for Class I, Division 2 Group A,B,C,D Hazardous Locations, certified for U.S.
and Canada. See UL File E194810.
CSA
(1794-OW8, 1794-OW8K)
CSA Certified Process Control Equipment. See CSA File LR54689C.
CSA Certified Process Control Equipment for Class I, Division 2 Group A,B,C,D
Hazardous Locations. See CSA File LR69960C.
CE
European Union 2004/108/EC EMC Directive, compliant with:
EN 61326-1; Meas./Control/Lab., Industrial Requirements
EN 61000-6-2; Industrial Immunity
EN 61000-6-4; Industrial Emissions
EN 61131-2; Programmable Controllers (Clause 8, Zone A & B)
European Union 2006/95/EC LVD, compliant with:
EN 61131-2; Programmable Controllers (Clause 11)
C-Tick
Australian Radiocommunications Act, compliant with:
AS/NZS CISPR 11; Industrial Emissions
Ex
(1794-OW8XT)
European Union 94/9/EC ATEX Directive, compliant with:
EN 60079-15; Potentially Explosive Atmospheres, Protection "n"
EN 60079-0; General Requirements
II 3 G Ex nA nC IIC T4X
when used at or below 60V AC or 75V DC
(1794-OW8, 1794-OW8K)
European Union 94/9/EC ATEX Directive, compliant with:
EN 60079-15; Potentially Explosive Atmospheres, Protection "n"
EN 60079-0; General Requirements
II 3 G Ex nA nC IIC T5X
when used at or below 60V AC or 75V DC
TÜV
(1794-OW8, 1794-OW8K)
TÜV Certified for Functional Safety:
up to and including SIL 2