Delta DVP32ES300T - Linking the CPU Module and a Module

DVP-ES3 Series Operation Manual
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4.3.1 Linking the CPU module and a module
Step 1: Use a flat head screwdriver to open the side cover on the CPU module for linking a module.
Step 2: Use a flat head screwdriver to release the I/O module securing clip.
Step 3: Connect the CPU module and the module with the I/O connecting ports.