IDEC FS1A Controller - Manual (Page 133)

5-92
Muting input
This function is for connecting a muting sensor with a solid state output (PNP output) or a
mechanical contact device such as a limit switch. As shown in Fig. 5-11, this function is comprised
of 2 input receiving circuits (X
n
) and one functional output (MI
n
).
・ For muting sensors with a solid state output (PNP)
・
For a mechanical contact device
Fig. 5-11 Circuit for muting input function
Connects to
Through-beam dark ON photoelectric switches with 3-wire PNP open collector outputs
Normally open proximity sensors with 3-wire PNP open collector output.
Warning
Do not use the muting input as safety input.
Description of operation
The operation timing is described in Fig. 5-12.
Ⅰ When the 2 output signals from the muting input devices, such as muting sensor, are
correctly connected to the 2 receiving circuits, the output is turned ON. (Ex. Sensor detects
objects.)
Ⅱ When the input signal to either of receiving circuits is turned OFF, the output is turned OFF.
(Ex. Sensor object detection is canceled.)
Ⅲ If safety check signals are not correctly supplied to the receiving circuit due to an error in the
sensor device or input circuit, the output is turned OFF immediately. Status of the detected error
is displayed by the error LED, input LEDs, and monitoring output. (Ex. Fault in sensor or wiring
error)
X
n
X
n+1
Input device
X
n
X
n+1
Input device
V+
MI
n
MI
n
V+
V-
V+
V-
Muting input
Muting input