Error: LED red (FAULT: AS-i communication error / periphery fault) SKU CYHDGJ6WWVHQ6L Operating voltage: 26.5...31.6 V DC Shortcode: ClassicL90 4AO (C) M12 IP67 Function display: LED yellow (indication of channels AO1...AO4) Electrical design: 4 outputs 0...20 mA Protection: IP 67 Housing materials: PBT Ambient temperature: 0...70 °C Operation: LED green (indication AS-i voltage / indication ext. 24 V AUX) current output: 0...20 mA voltage output: 24 DC ± 20 % V Product Name: AC2521