Schneider Electric CRM-115 Bus Expander Driver Interface

Schneider Electric CRM-115 Bus Expander Driver Interface is a Square D SY/MAX Class 8030 module that functions as a bus expander/driver interface, enabling a second I/O rack to be used with a SY/MAX Model 300 programmable controller system. It connects to the SY/MAX bus to extend the controller’s I/O capacity by adding an additional rack within the same SY/MAX network, allowing additional inputs and outputs to be controlled without replacing the primary PLC. In typical SY/MAX configurations, the CRM-115 is paired with the CRM-116 as a companion bus expander/terminator to enable the second I/O rack and ensure proper bus termination where required. The module is positioned for use with SY/MAX Model 300 PLCs and the 8030 Class, making it a practical option for maintaining or upgrading legacy automation installations and preserving investments in Square D SY/MAX hardware used in control panels and manufacturing lines. As part of Schneider Electric’s SY/MAX family, the CRM-115 reflects the era's modular approach to scalable automation, providing a straightforward path to expand I/O capacity in systems that rely on older Square D SY/MAX controllers.