6.2.3
Connection
of
general-purpose input terminals
Input specifications
I
LpF;fl
t
7rnA
I
3.3kR
Input terminal:
PGU
I
I
I
Internal
power
supply
I
for
control
'
I
I
I
I
-
.
-
.
-
.
-
.
By connecting the input terminal
to
COM3 terminal with a no-voltage contact or an NPN open
collector transistor, the input
ON
state is established and the input indicator
LED
is lit.
Input circuit:
The primary circuit of the input is insulated from its secondary circuit by the photo-coupler, and
the secondary circuit is provided with a C-R filter which is intended
to
avoid mis-triggering caused
by chattering
of
the input contact or noise from the input line.
Because of this, there
is
a response lag of approx.
3
msec for both
ON
to OFF and OFF to
ON
transitions. (response lag of
0.5
msec for
DOG
input)
Input sensitivity:
The input sensitivity current of the
PGU
is
1.5
to
3.4
mA.
Always be sure
to
allow an input current of more than 4mA for the input to turn
ON
safely, and
less than
1
mA to allow
it
to
go OFF with proper noise immunity.
Input connection example
When the forward (reverse) limit switch is turned OFF, the forward (reverse) pulse generation stops.
If the connection of the pulse generation is incorrectly made, operations often cannot be started nor
stopped.
Near-point Home
Forward Backward
General-purpose
signal Start Stop Manual return
Forward
Reverse
limit
limit
input
__
~.
24V
2%
-~~-~~
-~
~~
-
~
-
-~.
FX-1GM
PGU
I
For the connection of digital switch
to
the general-purpose inputs (x0
to
x3), see Pages 31
and 123.
-89-
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