IDEC FS1A Controller - Manual (Page 364)

LOGIC
5-316
Error detection function
Input monitoring and grounding detection
When an error is detected between the 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.
●When an input monitoring error detection time (0.5 s) is exceeded during the 2 input conditions is
the same condition (namely ON/ON or OFF/OFF).
●When there is an independent condition change of 1 of the inputs.
●When the ON state input circuit has been grounded.
The input LEDs blink and the monitoring output (Y
m
) sends pulses (1Hz), to notify the operator of
the corresponding input. See Fig. 5-6.
Short circuit
When an input error, such as short circuit or circuit failure, is detected, the SafetyOne changes to
the Stop state and displays "2" on the error LED display.
The input LEDs blink and the monitoring output (Y
m
) sends pulses (1Hz), to notify the operator of
the corresponding input.
Noise detection filter
The SafetyOne is tested acording to IEC/EN 61000-6-2, however in the case 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 supplied from the drive circuits (T
n
) to diagnose
connected safety devices and input circuits. Safety check signals can not be used as a power for
connected devices.