10_ product introductionproduct introductionI/O Board1 Fixing Hole Used to fix the main board to the I/O board using screws.2 Power LED Indicator The red indicator turns on in the normal power supply condition.3 Main Board ConnectionPort Connector used to connect to the main board.4 Output (Relay #5) Port Output port #5.5 Output (Relay #6) Port Output port #6 (FORM-C).6 Output (Relay #7) Port Output port #7 (FORM-C).7 Output (Relay #8) Port Output port #8 (FORM-C).1 2 3456789101121201918171615141312