Allen-Bradley 1771-OG Output Module for SLC 500

Allen-Bradley 1771-OG TTL Output Module for SLC 500 is a digital output module designed for use in AB 1771 I/O chassis within the SLC 500 family. The 1771-OG family provides TTL-level outputs that are compatible with the universal 1771-A1B, A2B, A3B, and A4B I/O chassis, allowing it to be dropped into existing SLC 500 racks. For higher-density applications, the 1771-OGD variant is the 16-point digital output option in the same family. These modules are used to switch external devices such as relays, indicator lamps, and other TTL-input driven circuits under the control of an SLC 500 processor, with outputs aligning to the standard AB I/O mapping used in SLC 500 systems. The 1771-OG/OGD modules integrate with the SLC backplane and provide isolated, low-voltage TTL signaling to drive peripheral circuitry, offering a compact solution for expanding digital control in older automation architectures. They mount in a 1771 I/O rack and share the AB SLC 500 wiring and addressing conventions, making them a straightforward upgrade or expansion path for projects requiring TTL-output control.