Specifications

Publication 1794-SG002D-EN-P - May 2012
34 Select FLEX I/O Modules
The 1794-OW8XT module is the extended temperature version of the
1794-OW8 module. The module is conformal coated.
Digital Contact Output Modules
Specification 1794-OW8, 1794-OW8XT
Number of outputs 8
Terminal base unit 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBN, 1794-TBNF, 1794-TB3K,
1794-TB3SK, 1794-TBNKF
External DC supply
voltage range
19.2…31.2V DC
(includes 5% AC ripple)
External DC supply
current, nom
125 mA
Leakage current, off-state
output, max
1 mA @ 240V AC (through a snubber)
Output delay time, OFF to
ON, max
10 ms
(1)
(1) time from valid output on signal to relay energization by module.
Output delay time, ON to
OFF, max
10 ms
(2)
(2) time from valid output off signal to relay deenergization by module.
Relay output current
rating, resistive
2.0 A @ 5…30V DC
0.22 A @ 125V DC
2.0 A @ 125V AC
2.0 A @ 250V AC
Relay output current
rating, 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, 15 A make @ 120V AC, PF = cos θ = 0.35
2.0 A steady state, 7.5A make @ 240V AC, PF = cos θ = 0.35
Contact resistance, initial 30 mΩ
Switching frequency 0.3 Hz (1 operation every 3 s)
Bounce time, mean 1.2 ms
Contact load, min 100 µA @ 100 mV DC
Mechanical life 100,000 operations at rated loads
Fusing 3.0 A. 250V AC slow blow fuse (Littelfuse part number 239003).
Power dissipation, max 5.5 W @ 31.2V DC
Thermal dissipation, max 18.8 BTU/hr @ 31.2V DC
Dimensions (HxWxD),
approx
46 x 94 x 53 mm (1.8 x 3.7 x 2.1 in.)
94 x 94 x 69 mm (3.7 x 3.7 x 2.7 in.) installed
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 720V DC for 60 s, power to backplane.