The lamp test module combines several functions in one module (individual or collective messages and lamp test). The incoming fault messages are placed at the inputs (1, 3, 5, 7, 9, 11, 13). The indicator lamps are connected to the outputs (2, 4, 6, 8,10, 12, 14). If a message is present at an input, the corresponding indicator lamp lights up. At the same time, a signal is transmitted to the SA output. If a signal is applied to the SE input, all indicator lamps light up without a signal being transmitted to the SA output. Please do not use for 230 V LEDs! (capacitor power supplies), for 7 lamps, output for collective message, input for lamp test, connection with screw terminals