IDEC FS1A Controller - Manual (Page 379)

LOGIC
5-331
Chapter 5
Two hand control
This function adds a two hand control function to the connected the safety device. As shown in
Fig.5-30, this function is comprised of 2 safety inputs (I
n
, I
n+1
) and a functional output (O
n
). The
function outputs of dual channel NO/NC output are connected to safety inputs (I
n
, I
n+1
) of this
function.
Fig. 5-30 Two hand control function circuit
Description of operation
The operation timing is described in Fig. 5-31.
I If the both of safety inputs turn ON, function output turns ON.
II If the one of safety outputs turns, function output turns OFF.
(1) The input status of both of safety inputs are different over the input monitoring error detection
time (0.5s), function output kept at OFF state.
(2) The one of inputs change the state independently on another input, function output kept at
OFF state.
Input monitor error
detection time：Max.0.5s
①
Ⅰ Ⅱ Ⅱ Ⅰ Ⅱ
Over 0.5s
Ⅰ
①
② Independent conditon
change in one input
I
n
I
n+1
O
n
ON
OFF
ON
OFF
ON
OFF
Fig. 5-31 Operation timing of the two hand control function
I
n
O
ｎ
Two-hand
control
Type IIIC
Safety Input 1
Safety Input 2
I
n+1