Specifications

Publication 1794-SG002D-EN-P - May 2012
22 Select FLEX I/O Modules
1794-OA16 Derating Curve
The area within the curve represents the safe operating range for the module
under various conditions of user supplied 220V AC supply voltages and ambient
temperatures.
= Normal mounting safe operating range included
= Other mounting positions (including inverted horizontal, vertical) safe
operating range
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 120V (continuous), I/O to system
(and channel to channel for 1794-OA8I)
No isolation between individual channels
Tested to 2150V DC for 1 s and 1250V AC for 60 s
Tested at 2600V DC
for 1 s, I/O to system
No isolation between
individual channels
250V (continuous),
Basic Insulation Type,
field side to backplane
No isolation between
individual channels
Type tested at
1250V AC for 60 s
(1) The external AC supply voltage must be capable of a 50 A surge for 1/2 cycle at power-up.
(2) 1794-OA8I – isolated voltage
(3) sufficient to operate an A-B 500 NEMA size 3 motor starter
(4) Auxiliary terminal strips are required when using the 1794-TBN for the 1794-OA16.
(5) If using 0.5 A outputs, alternate wiring so that no two 0.5 A outputs are adjacent. See the 1794-OA16 Derating Curve
for mounting other than the normal horizontal.
(6) See the 1794-OM8 Derating Curve
.
Digital AC Output Comparison
Specification 1794-OA8, 1794-OA8I 1794-OA16 1794-OM8 1794-OM16
IMPORTANT
• The output signal delay, OFF to ON or ON to OFF is 1/2 cycle
maximum.
• Modules have a yellow status indicator for each channel. These
indicators are driven from the logic-side circuitry.
• Module outputs are not fused. Fusing of individual outputs is
required. If applicable, the 1794-TBNF is recommended, otherwise
you must provide external fusing. The following fuses are
recommended:
- 1794-OA8, 1794-OA8I – Use 1.6 A, 250V Slow-Blow, Littelfuse (part
number 23901.6); San-o SD6-1.6 A (AB part number 94171304). The
1794-TBNF comes with SD6-1.6 A fuses installed.
- 1794-OA16 – Use 2.5 A, 150V MQ2 normal fuse.
- 1794-OM8 – Use 0.8 A, 250V MQ4 normal fuse.
Ambient Temperature °C
V
in
On-State
Voltage
(V AC)