Timing for Fetching from an External Digital Switch
PARA
No.
18
is used to designate the home position return direction. This is also used for selecting
the timing for fetching the signals from an external digital switch. Either timing of
8
msec/digit or 64
msec/digit can be selected
by
using an F2-30TP (version V1.3 or after).
Setting
'0'
Current address increases.
8
mseddigit
Setting
'1'
Current address decreases.
Setting
'2'
Current address increases. 64 rnsecldigit
Setting
'3'
Current address decreases.
The following shows the external digital switch input timing when the PARA
No.
14 (block
designation) setting is "2";
-
ams
*I
PGU
Y4
(1st digit)
PGU
Y5
(2nd digit)
t
4
PGU
X0
to
X3
(data input)
1st
digit
data 2nd
digit
data
*1:
8 msec when
PARA
No.
18
is
'0'
or
'l',
and
64
msec when
it
is
'2' or
'3',
'2:
input
filter
timing
The same timing is used for data fetching from an external digital switch when an SPD, EXT, or
RPT instruction is used.
Usually a timing of
8
msec/digit is selected for fetching data from an external digital switch.
When output data of a programmable controller other than the
FX
series is fetched through the input
channels of the
PGU,
as shown below, and
if
the response of the programmable controller is slow,
select
64
msec/digit to improve the timing of the I/O operations between the two.
When
X10
is
ON,
the 1st digit of data is output
to
Y10
to Y13.
When
X1
1
is
ON,
the 2nd digit of data
is
output
to
vi0
to Y13.
After
X10
or
X1
1
is turned
ON,
data has to be
output within 61 msec (64 msec
-
input filter 3
msec).
(a)
-
136
-
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