7.5 Monitoring Safety Input Signals7-77 Monitor Displays (Un)7.5 Monitoring Safety Input SignalsThe status of safety input signals can be checked with the safety I/O signal monitor (Un015). The procedurefor the method of interpreting the display and a display example are shown below.7.5.1 Interpreting Safety Input Signal Display StatusThe safety I/O signal monitor (Un015) can be read in the following way. The upper level indicates ON, andthe lower level indicates OFF. All undefined digits are shown in the lower level (OFF).Note: Input signals use the following circuit configuration.• OFF: Open• ON: Short-circuitedExample7.5.2 Safety Input Signal Display ExampleSafety input signals are displayed as shown below.• When the /HWBB1 signal turns OFF to activate the HWBB functionDisplay LED Number Input Terminal Name Signal Name1 CN8-3, -4 /HWBB12 CN8-5, -6 /HWBB23 − Reserved4 − Reserved5 − Reserved6 − Reserved7 − Reserved8 − ReservedU n 0 1 5 =8 7 6 5 4 3 2 1 digitON (short-circuited)U n 0 1 5 =8 7 6 5 4 3 2 1 digitThe first digit isin the lower level.
