The Allen - Bradley 1771 - IVN/C is a digital DC input module. Here are its brief parameters:
Type: Digital DC input module
Number of Inputs: 32 inputs (4 sets of 8)
DC Operating Voltage: 10 - 30 VDC
Mounting: Rack - mountable
Dimensions: 16.5 x 5.4 x 4.1 cm
Weight: Approximately 0.36 kg
Communication Interface: RS - 485, supporting communication speeds up to 9600 bps
Operating Temperature Range: - 20 °C to 70 °C