IDEC FS1A Controller - Manual (Page 134)

5-93
X
n
X
n+1
MI
n
Input monitor error
detection time：Max.3s
①
② Independent conditon
change in one input
SafetyOne changes to the
Protection after an input
monitor error is detected.
The monitor output
corresponding to the input
which occur error becomes
pulse output (1Hz).
0.5s 0.5s
Ⅰ Ⅱ Ⅲ Ⅱ Ⅰ Ⅱ
Y
m
(Monitor output)
Ⅱ
Cance-
llation
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Fig. 5-12 Operation timing of the muting input function
Error detection function
Input monitoring and grounding detection
When an error is detected at the inputs, the SafetyOne changes to the Protection state and
displays "1" on the error LED display. The conditions to be detected as an input error are shown
below.
(1) When the input monitor error detection time (3s) is exceeded during the 2 input conditions and
they do not match (namely ON/OFF or OFF/ON).
(2) When there is an independent condition change of the 1 of the input.
(3) When the ON state of the input goes to the ground state.
The input LEDs blink and the monitoring output (Y
m
) send pulses (1Hz), to notify the operator of
the corresponding input. See Fig. 5-12
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.
Note: Drive circuit corresponding to muting input (T
n
, T
n+1
) is always OFF.