Chapter 1 Introduction 2. Remove the module. 3. Slide the new module in as shown below. 1_ 1.3.4 Installing and Removing an Extension Card Installation Push the extension card into the extension card slot until you hear a click. Note: before the installation begin, you need to check if the pin arrangement and appearance are normal. If to make sure everything is ok. there is any bent or missing pin, you need to change to a new card. You should also check the PLC card slot Removal Press the tab labeled PUSH to release the extension card, and then remove the extension card. 1-11