ABB 3HAC031977-001/04 SBM BoardDescription The ABB 3HAC031977 001 04 is an industrial automation product. It is a programmable controller primarily used to control industrial processes and machinery. Specifications Input Voltage: 24 V DC 20% Input Current: Maximum 5 mA Output Voltage: 24 V DC 20% Output Current: Maximum 0. 5 A Number of Inputs: 16 Number of Outputs: 16 Input Type: Single ended and differential Output Type: Relay Features High Speed Processing: The 3HAC031977 001 04