IDEC FS1A Controller - Manual (Page 367)

LOGIC
5-319
Chapter 5
Mode select input
This function is for connecting devices with a mode select function, such as a selector switch.
As shown in Fig. 5-9, this function is comprised of 2 input receiving circuits (X
n
, X
n+1
), 1 drive circuit
(T
n
), and a functional output (TEACH, AUTO).
Fig. 5-9 Circuit for mode select input function
Connects to
Mode selecting device such as a selector switch or a rotary switch
Note: This cannot be connected to a safety light curtain or any other safety solid state output.
Description of operation
The operation timing is described in Fig. 5-10.
I-1 When a safety check signal from the drive circuit (T
n
) is supplied to 1 of the receiving circuits
(X
n+1
), and the other receiving circuit (X
n
) is OFF, the output “AUTO” is turned ON.
I-2 When a safety check signal from the drive circuit (T
n
) is supplied to 1 of the receiving circuits
(X
n
), and the other receive circuit (X
n+1
) is OFF, the output “TEACH” is turned ON.
II-1 When both receiving circuits are OFF, both of outputs “TEACH” and “AUTO” are turned
OFF. (Ex. The selector switch is in the intermediate position.)
II-2 When both receiving circuits are ON, both of outputs “TEACH” and “AUTO” are turned OFF.
And if the input monitoring error detection time (0.5s) is exceeded during the time both
receiving circuits are ON, an input monitoring error is detected.
III If safety check signals are not supplied correctly to the receiving circuits due to an error in
the selected mode device or input circuit, the output is turned OFF immediately. Status of
the error is displayed by the error LED, input LEDs, and the monitoring output. (Ex. Fault
in selector switch or wiring error)
X
n
X
n+1
TEACH
ON
OFF
Input monitor error
detection time：Max.0.5s
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
II-1 I-2 Ⅲ
ON
OFF
ON
OFF
ON
OFF
Cance-
llation
AUTO
ON
OFF
I-1 II-2 I-2 II-2 I-2
Fig. 5-10 Operation timing of a mode select input function
X
n
T
n
X
n+1
Mode selector device
TEACH
AUTO
Mode
Select