Cause : Ext I/O comm loss comes when the I/O extension module types specified by parameters do not match the detected configuration.

Check the event log for an auxiliary code (format XXYY YYYY). “XX” specifies the number of the I/O extension module (01: parameter group 114 Extension I/O module 1, 02: 115 Extension I/O module 2, 03: 116 Extension I/O module 3). “YY YYYY” indicates the problem (see actions for each code below):

• 00 0001 - Communication with module failed. Check that the module is properly seated in its slot. Check that the module and the slot connector is not damaged. Try installing the module into another slot.
• 00 0002 - Module not found. Check the type and location settings of the modules (parameters 114.01/114.02, 115.01/115.02 or 116.01/116.02). Check that the module is properly seated in its slot. Check that the module and the slot connector is not damaged. Try installing the module into another slot.
• 00 0003 - Configuration of module failed. Check the type and location settings of the modules (parameters 114.01/114.02, 115.01/115.02 or 116.01/116.02). Check that the module is properly seated in its slot. Check that the module and the slot connector is not damaged. Try installing the module into another slot.
• 00 0004 - Configuration of module failed. Check the type and location settings of the modules (parameters 114.01/114.02, 115.01/115.02 or 116.01/116.02). Check that the module is properly seated in its slot. Check that the module and the slot connector is not damaged. Try installing the module into another slot.