Allen-Bradley 1771-OA

The output module is powered by the power supply connected to the I/O chassis backplane. The module requires a maximum current of 210mA from the +5V dc output of this supply. Total the current requirements of this module with the other modules in the I/O chassis to avoid overloading the supply or the I/O chassis backplane.

The 1771-OA module is a modular component of the 1771 I/O system requiring a properly installed system chassis. Refer to publication 1771-IN075 for detailed information on acceptable chassis, proper installation and grounding requirements. Limit the maximum adjacent slot power dissipation to 15W maximum.

You make connections to the module through the 1771-WA field wiring arm shipped with the module. The arm pivots on the chassis to connect with the 8 terminals on the front of the module. The wiring arm allows the module to be removed from the chassis without disconnecting wiring. 1. Make certain all power is removed from the module before making wiring connections. 2. Swing the wiring arm up into position on the front of the module. The locking tab on the module will secure it into place.

You can use an output of the 1771-OA module to drive an input of a 120V AC input module (1771-IA, -IA2, -ID and -IAD) to indicate status, such as the turning on a motor starter (Figure 2). However, you must add an external resistor between the output terminal and the common (L2) (Figure 2). Typically, this is a 2.5K ohm, 10W resistor.