The 57C415 is a Digital Input Module created by Reliance Electric. It may have also been sold, at one point, by Baldor Reliance and Asea Brown Boveri depending on when it was created.
The 57C415 is a 24-volt AC/DC Input Module. It was created to go with a DCS 5000 or an AutoMax system. The maximum input voltage for this device is 30V RMS. This model has the ability to manage 16 control signals that are AC/DC 24 volt and 50/60HZ. These signals also maintain a 2500V logic common to isolation. This device is mainly used to provide the on/off function to a variety of simple devices like a push-button or a relay contact.
The faceplate on the 57C415 has 16 input connections that are labeled numerically 0-15. There are also four groups of four LED indicators that are also labeled 0-15. Each one of the LEDs monitors an LED connection. There is also a dial that is labeled with the letters B-G and a dial labeled with the numbers 1-3 and 6-8.
The 57C415 is a printed circuit board with a faceplate that is being housed in a protective chassis. This entire module can be plugged into a slot on a card storage rack. By inserting the module through the open side on the rack, you can insert the module into an open set of card slots. Once that is secured, you can then mount the card fully onto the rack using two screws and mounting brackets that are on the rack and the card.