The Allen-Bradley 1790-T8A0X CompactBlock LDX I/O digital expansion module is an 8-bit input expansion I/O module with DeviceNet network capability that is designed to offer cost-effective I/O solutions to industrial automation applications. This B Series module and every other module in its class use the state-of-the-art device-level network known as DeviceNet, and it comes with a compact design that makes it suitable for low-cost and tight panel space applications. The 1790-T8A0X module is compatible with the Allen-Bradley PLC, SLC, Logix, or SoftLogix programmable controllers and it communicates with these controllers via the DeviceNet scanner modules.

The 1790-T8A0X module has 8 non-isolated inputs with 85 to 132 Volts AC on-state voltage range with 9 milliamps of maximum on-state current (at 132 Volts AC input), and an off-state voltage rating of 45 Volts AC maximum. This module requires an external 110 Volts AC power supply for operation, and it has a maximum power capacity of 3 Watts at 132 Volts AC input. The 1790-T8A0X module can be used for I/O expansion for both digital and analog base modules, and it can be configured easily by using the embedded ESD files. The 1790-T8A0X is compatible with the NEMA/UL Type 1 AC modules, and it comes with the fixed screw-type termination design. It has an isolation voltage rating of 1250 Volts AC, and it uses the 1 Amp, 240 Volts AC normal blow fuse for AC line protection. The 1790-T8A0X module has a maximum signal delay time of 10 milliseconds (off to on) and 30 milliseconds (on to off), and it also has 8 LED light status indicators which show the network and module status.