Systems and methods are provided for utilizing electronic
keying features stored within one of the components (e.g., I / O modules, terminal blocks, bases, and so forth) of I / O devices, and which may be read or detected by electronic key identification circuitry in one of the other components of the I / O devices. More specifically, the electronic
keying features may include unique identification keys that may be read or detected by the electronic key identification circuitry to determine whether the components (e.g., a paired I / O module and terminal block) are associated with each other and intended to operate together. For example, in certain embodiments, the electronic key feature may be disposed within a terminal block and the electronic key identification circuitry may be disposed within an I / O module, or vice versa. In addition, in certain embodiments, the electronic key feature and / or the electronic key identification circuitry may be removable from their respective component of the I / O device.