GE PV2121ED160012CT是GE通用电气的一款数字量扩展模块。它通常用于GE的工业自动化和控制系统中，用于扩展数字输入和输出（I/O）点，以连接和控制各种数字设备和传感器。它的特点包括高精度、可靠性以及适用于多种环境的高适应性

It is a large circuit board with eight connection terminals, with different sizes on both sides of the board. There is a small red square in the lower left corner with a toggle switch on top. In addition, there are approximately 50 sky blue small diodes, six silver diodes, 45 EPROMs, and e EPROMs on the circuit board. It also has eight strip capacitors, each connected to the circuit board with ten pins, and 36 light-emitting diodes or light-emitting diodes.