Function display: LED yellow (indication channels AI1...AI4) Operating voltage: 26.5...31.6 V DC Error: LED red (FAULT: AS-i communication error / periphery fault) Operation: LED green (indication AS-i voltage / indication ext. 24 V AUX) Product Name: AC2516 Shortcode: ClassicLine90 4AI (C) M12 IP67 Electrical design: 4 inputs 4...20 mA Housing materials: PBT SKU LT8S1DZ5US77OE Protection: IP 67 Ambient temperature: 0...70 °C