The EM-xx series of plug-in modules are used to expand connectivity capabilities of HMIs and control systems, e.g., AMR-OP83. These communication modules plug into the mini PCIe slots located on the main board of control systems or HMIs accessible after dismounting the cover (see the operation manual of a given piece of HW).
-communication modules for a galvanically isolated RS485 interface, RS232 interface or the CAN bus