IDEC FS1A Controller - Manual (Page 373)

LOGIC
5-325
Chapter 5
Monitor input
This function is for connecting a switch (mechanical contact device) or sensor with a solid state
output (PNP output) as a start input. As shown in Fig. 5-15, this function is comprised of 1 receiving
circuit (X
n
) and 1 functional output (I
n
).
- For mechanical contact device
- For input device with solid state output (PNP)
Fig. 5-15 Circuit for monitor input function
Connects to
Input device such as a mechanical contact switch, a photoelectric switch, or a proximity switch
Warning
Do not use the monitor input as a safety input. When there is a failure in the SafetyOne or
peripheral devices, the safety system will not function properly as intended.
Description of operation
Operation timing is described in Fig. 5-16.
When the output signals from the start input device are correctly supplied to the receiving circuit,
the output (I
n
) turns ON.
I
n
X
n
on
off
on
off
note 1)
note 1) This time is part of the Reaction time which is shown at
"Electrical conditions" in General specifications.
note 1)
note 1)
note 1)
Fig. 5-16 Operation timing of the monitor input
Error detection function
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.
X
n
Input device
I
n
V+
V-
X
n
Input device
V+
I
n Single Channel
Monitor
Single Channel
Monitor