I / O modules are very important controls part in the LHM equipment. Due to the high number and variety of the modules and the very high cost of currency also the lack of access to resources for supply, therefore, with technical studies and feasibility studies, all stages of the design and construction of these modules have been done incountry. To build these modules, two important sections are carefully considered, which explained  below :

- Design of I/O circuit boards and modules controller boards and designing some modules to enhance efficiency and reliability 
- Software actions such as software developments and upgrades, module modifications, and building the  metal sections and sockets.