IDEC FS1A Controller - Manual (Page 123)

5-82
Input functions
Dual channel direct opening input
This function is for connecting safety devices with dual channel direct opening action mechanisms,
such as an emergency stop switch or an interlock switch. As shown in Fig. 5-1, this function is
comprised of a dual channel input receive circuit (X
n
, X
n+1
), drive circuit (T
n
, T
n+1
), and function
output (I
n
).
Fig. 5-1 Circuit for dual channel direct opening input functions
Connects to
Safety devices with direct opening mechanisms, such as an emergency stop switch or an
interlock switch.
Note: This cannot be connected to a safety light curtain or other safety solid state outputs.
Description of operation
The operation timing is described in Fig. 5-2.
Ⅰ When safety check signals from the 2 drive circuits are supplied to the 2 receiving circuits,
the output is turned ON. (Ex. Emergency stop switch is released, the guard is closed.)
Ⅱ When safety check signal to either of the receiving circuits is turned OFF, the output is
turned OFF. (Ex. Emergency stop switch is released, the guard is opened.)
Ⅲ If safety check signals are not correctly supplied to the receiving circuits, due to the error in
the safety device or input circuit, the output is turned OFF immediately. Status of any
detected error is reflected by the error LED, input LEDs and monitor output. (Ex. Fault in
emergency stop switch or interlock switch, or wiring.)
X
n
X
n+1
I
n
Input monitor error
detection time：Max.0.5s
①
② Independent conditon
change in one input
Y
m
(Monitor output)
The monitor output
corresponding to the input
error becomes pulse output
(1Hz).
0.5s 0.5s
Ⅰ Ⅱ Ⅲ Ⅱ Ⅰ Ⅱ
SafetyOne changes to
Protection after an input
monitor error is detected.
Ⅱ
Cance-
llation
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Fig. 5-2 Operation timing of a dual channel direct opening input function
X
n
T
n
X
n+1
T
n+1
I
n
Safety device
Dual Channel
Direct Opening