IDEC FS1A Controller - Manual (Page 124)

5-83
Error detection function
Input monitoring
When an error is detected between dual channel inputs, the SafetyOne changes to the Protection
state and displays "1" on the error LED display. The conditions to be detected as input errors are
shown below.
(1) When the input monitor error detection time (0.5s) is exceeded during 2 input conditions or do
not match (namely ON/OFF or OFF/ON).
(2) When there is an independent condition change at 1 of v the inputs.
The input LEDs blink and the monitor output (Y
m
) outputs pulses (1Hz), to notify the operator of
the corresponding input. See Fig. 5-2.
Short circuit and grounding detection
When an input error, such as a short circuit, grounding, or circuit failure, is detected, the
SafetyOne changes to the Stop state and displays "2" on the error LED display.
Noise detection filter
When the SafetyOne is used in an environment with severe noise, the SafetyOne changes to the
Stop state and displays "9" on the error LED display.
Warning
Safety check signals (pulses signals) are transmitted from the drive circuits (T
n
) to diagnose
connected safety devices and input circuits. Safety check signals can not be used as power for
connected devices.