Description
1771-IBD Allen-Bradley Digital DC input module
The Allen-Bradley 1771-IBD is a discrete input that is part of the 1771 product family. The module is a single slot wide assembly with primarily sixteen (16) discrete input channels of 10-30VDC. It is installed on any available 1771 chassis except the 1771-A1, 1771-A2, and 1771-A4.
Discrete input modules such as the 1771-IBD are commonly used to connect field signal devices such as switches, sensors, and auxiliary contacts representing process states. It is particularly suitable for use with on/off; 1 or D or binary operation device.
The 1771-IBD is equipped with eighteen (18) LED status indicators that provide information about the status of the module and the signal status of each input channel of the module. It also comes with a field wiring arm that is compatible with replacement part number 1771-WH. Field wiring arms are used to provide a modular wiring method because they can be removed from the module when terminating signals. In addition, they contribute to ease of maintenance as they can be removed and installed into compatible modules without the need to disconnect the wires.
The 1771-BD requires a minimum input current of 4.5 MA at 10 volts DC, 15 MA at 30 volts DC, and 2.0 mA at 5 volts DC in the off state. It has a 1ms input signal delay for low to high signal conversion, and a 1ms or 6ms high to low signal conversion. It has a power rating of 7.3 watts (maximum). , 1.0 watts (minimum.) And 24.7 BTU/hr heat dissipation (Max. , 3.4 BTU/ hour (min.). .
The 1771-BD comes with a 1771-WH boom for easy wiring and easy module replacement in the event of module failure, so there is no need to disconnect the wiring first. It supports 1 – and 2-slot I/O addressing. It is compatible with source switchgear such as dry contact switches, electromechanical emitters and panel switchgear such as selector switches and buttons. The 1771-BD module has 16 inputs in the 10 to 30 volt DC absorption (source load) voltage category. It operates at a voltage range of 10 to 30 volts DC. It has a typical signal delay of 1.3 ms (0.1) in the DC state and 1.3 ms (0.1) in the DC off state. It has a maximum off state current of 2mA and a backplane current load of 130 mA. It has a maximum power consumption of 6W and a heat dissipation of 20.3 BTU/ hour. It is installed in a 1771 /O case containing the PLC processor. The keying tape used to put it into the correct slot is located between pins 16 and 18 of the upper connector and between pins 10 and 12 of the lower connector. The 1771-BD module has one green status indicator and 16 red status indicators for client indicators on the front panel. It includes photoelectric isolation to protect system circuits from electrical transients. It also has input filtering to reduce electrical noise.
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