The 42CRC-4000 controller is a 42CRC color registration control device that has been designed by Allen-Bradley and included in the Photoswitch series. The main function of this device is to detect pre-printed registration marks that are displayed against contrasting backgrounds. This can be achieved by having the controller sense the difference in the gray scales between the mark and the background through the use of a technology known as the Automatic Gain Control (AGC) technology. This device also comes with 2 sources of light which are a red LED and a green LED that the controller uses in its color registration functions. The Allen-Bradley 42CRC-4000 42CRC color registration controller must be mounted over an opaque plate to prevent it from giving false signals due to web flutter. This device requires a Photoswitch cable assembly that can be selected from the accessory catalog so that it can connect to other devices.

The Allen-Bradley 42CRC-4000 42CRC Photoswitch color registration controller can operate in the latch and non-latch operation modes and they are also suitable for light and dark mark sensing, automatic operation, and manual operation applications. These operating options can be selected after the device has been installed and aligned in its host system. The Allen-Bradley 42CRC-4000 42CRC color registration controller requires a voltage supply of 10 to 30 Volts DC and it has a current consumption rating of 70 milliamps. This specific Photoswitch controller comes with an open collector that comes with an NPN (current sink) feature. The 42CRC-4000 42CRC Photoswitch color registration controller has a minimum web velocity of 2 inches per second. The device comes with a length, height, and depth of 97, 75, and 22 millimeters, respectively. It also has an approximate weight of 350 grams.