IDEC FS1A Controller - Manual (Page 366)

LOGIC
5-318
X
n
X
n+1
I
n
ON
OFF
Input monitor error
detection time：Max.0.1s
Independent conditon
change in one input
Y
m
(Monitor output)
SafetyOne changes to
Protection State after an input
monitor error is detected.
1Hz pulse signal is output from
corresponded monitor output.
0.5s 0.5s
Ⅰ Ⅱ Ⅲ Ⅱ Ⅰ Ⅱ
ON
OFF
ON
OFF
ON
OFF
Ⅱ
Cance-
llation
Fig. 5-8 Operation timing of a dual channel safety input function
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 (0.1s) is exceeded during the 2 input conditions
and they do not match (namely ON/OFF or OFF/ON).
●When there is an independent condition change of 1 of the inputs.
●The input circuit of the ON state has gone to ground.
The input LEDs blink and the monitor output (Y
m
) supplies pulses (1Hz), to notify the operator of
the corresponding input. See Fig. 5-8.
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.
Note. Drive circuit corresponding to the dual channel safety input (T
n
, T
n+1
) is always OFF.