GE / IP FANUC Series 90/30 In Stock
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The 1771-OW is a powerful Allen Bradley PLC module that can be used to switch resistive modes. It offers two types of configurations; normally-open (or Form A), and normally-closed (or Form B). Since the 1771-OW does not have any surge limiting circuitry, it is suitable for use with resistive loads only and not capacitive or inductive loads. Rated at 24 to 138 Volts AC RMS, or 24 to 125 Volts DC, 1 Amps per channel. Its minimum contact load is 10 mil-Amperes at 24 Volts AC and 24 Volts DC. This contact module can be installed in any Universal I/O Chassis designed by Allen-Bradley like the 1771-A1B, 1771-A2B, 1771-A3B, or the 1771-A4B. Before carrying out any installations, make sure to calculate the module’s power requirements. Add 700mA at 5 Volts DC (which is the current needed by the 1771-OW) to the obtained value. Be sure to check that the combined current requirement does not exceed the standard current driving potential of the chassis’ power supply.
The module can be conveniently placed in any slot available on the I/O chassis except for the extreme left slot, which is usually meant for the remote input/output adapter module. It is recommended that low voltage DC and analog input modules are positioned far away from high voltage DC and AC modules to reduce electrical noise interference. To connect field wiring to this module, a wiring arm is normally used. Signals must be connected to screw terminals available on the wiring arm, which is then linked to the 1771-OW’s front tab connector. Each relay contact can be configured for both NO and NC operation. When using a shielded cable and shield grounding is desired, it is suggested that the connection be done on one of the chassis mounting bolts. In order to prevent ground loops, only one terminal on the cable shield needs to be grounded. Remember that all power to the chassis should be shut off before any module is inserted.
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