The 44A749939-001 module is an I/O interface module that has been manufactured by GE Fanuc Automation and included in Series 90-70 as a Parallel I/O interface device. This type of module is widely used in different industries to connect to a PLC and to different input or output equipment to enhance operations and enable the use of new functions. This module supports up to 8 channels, which means it comes with 8000 inputs and 8000 outputs. It comes with a bus length of up to 2000 inches that is been made up of 4 segments with lengths of 500 inches each. The module also comes with 2 front-panel DB37 connectors that make it able to be connected to different I/O buses from the same series. The GE Fanuc Automation 44A749939-001 I/O interface module supports passive mode operations and enables the monitoring of all the I/Os connected to a Series Six system.

The GE Fanuc Automation Series 90-70 44A749939-001 I/O interface module comes with 6 LED indicators that are located at the top of the module. During the initialization of the module, all the LEDs are cycled twice during an LED test. These LEDs are assigned to each of the special functions that the machine goes through during the manufacturing test mode. The GE Fanuc Automation 44A749939-001 I/O interface module comes with 2 DB37 ports, both male and female. The items associated with the use of this module are I/O cables, an I/O terminator, a station manager cable, and a terminator plug. It is recommended to make sure to use the priority input mode, and all the users need to be properly trained to perform data transfers when required with this device.