Specifications

Publication 1794-SG002D-EN-P - May 2012
Select FLEX Ex I/O Modules 89
1797-OB4D 24V DC 4 Point Non-isolated Source Output Module
• 4 output channels referenced to a single supply
• Yellow LED to indicate output state, output ON = LED ON
• Fault indication, signal to the backplane and status indicator LED (per
channel) blinking red for fault
• Output short circuit detection
• Output wire-off detection
• Output wire-off detection on per channel basis via module data bit
• Electronically short-circuit protected, fault reported to controller
• All channels updated from the backplane every 2 ms
• Output fault state programmable
Schematic Drawing of the 1797-OB4D Module
Intrinsically safe input type II (1)2G Ex ib[ia] IIC T4
Class I,
Div. 1, Groups A-D and Class I, Zone 1,
AEx ib/[ia] IIC
Noxious gas exposure Tested to severity level G3, ISA-S71.04-1985
FLEX Ex power consumption 2.8 W @ 9V
Power dissipation 2.8 W
Thermal dissipation, max 9.6 BTU/hr
Dimensions (HxWxD), approx 46 x 94 x 75 mm (1.8 x 3.7 x 2.95 in.)
94 x 94 x 91 mm (3.7 x 3.7 x 3.6 in.) installed
(1) 1 ms default selectable.
(2) 1 ms default selectable.
16 Point Non-isolated NAMUR Input Module
Specification 1797-IBN16
Power supply
+
-
SolenoidBus
μC
FlexBus
Audible
alarm
Valve
+
-