IDEC FS1A Controller - Manual (Page 385)

LOGIC
5-337
Chapter 5
Error detection function
EDM input monitoring
When the following condition is satisfied, the SafetyOne changes to the Protection state and
displays "1" in the error LED display.
(1) When the EDM input does not turn ON within the EDM monitoring time (1 s) after the hold input
turns ON.
(2) When the EDM input does not turn ON within the EDM monitoring time (1s) after safety output
turns OFF.
(3) When the EDM input does not turn ON within the EDM monitoring time (1s) after EDM input
turns OFF during safety output is OFF state.
The input LEDs (Y
m
) blink transmits pulses, to notify the operator of the corresponding EDM input
(I
n
).
Short circuit and grounding detection
When an output error, such as short circuit, grounding or circuit failure, is detected, the SafetyOne
changes to the Stop state and displays "4" on the error LED display.
The output LEDs blink and the monitor output outputs pulses (1Hz), to notify the operator of the
corresponding output.
Note. OFF check signals are outputted at a fixed interval while the safety output is ON for checking
the OFF function of the output circuit. Refer to "Chapter 2 PRODUCT SPECIFICATION" for
details.