IDEC FS1A Controller - Manual (Page 359)

LOGIC
5-311
Chapter 5
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 emergency stop switches or interlock
switches.
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 2 drive circuits are supplied to 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 an 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
ON
OFF
Input monitor error
detection time：Max.0.5s
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. 5-2 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