The "1715-IB16D" module has 16 digital input channels, which means it can monitor the status of 16 discrete devices or sensors. It supports both sinking and sourcing input types, allowing it to interface with a wide range of devices.

Each input channel is electrically isolated from the others, providing protection against noise and voltage spikes. The module communicates with the PLC's processor over a backplane connection, allowing it to exchange data and control signals with other modules in the system.

The module supports a variety of input voltage ranges, typically 10-30V DC or 5-125V DC. It can handle both AC and DC signals, making it versatile for different application requirements.

Allen Bradley 1734 Series Plc Model 

1734-IE2V

1734-IE4C

1734-IJ

1734-IK

1734-IM4

1734-IT2I

1734-OA2

1734-OA4

1734-OB2

1734-OB2EP

1734-OB4

1734-OB4E

1734-OB8

1734-OE2V

1734-OV8E

1734-OW4

1734-PDN

1734-RTB

1734-SSI

1734-TB

1734-TB3

1734-TBCJC

1734-TBS

1734-TOP

1734-TOP3

1734-TOP3S

1734-TOPS