Download Transition from MELSEC-AnS/QnAS (Small

6
HIGH-SPEED COUNTER MODULE REPLACEMENT
(3) Comparison between A1SD62D(-S1) and LD62D
: Compatible,
Item
Number of occupied I/O points
Counting speed switch setting
Count
input signal
LD62D
32 points
(I/O assignment: special 32
points)
16 points
(I/O assignment: intelligent 16 points)
200K
10K
500K
(200K to
500KPPS)
200K
(100K to
200KPPS)
100K
(10K to
100KPPS)
1-phase
input
200KPPS
10KPPS
2-phase
input
200KPPS
7KPPS
500KPPS
24-bit unsigned binary
(0 to 16777215)
200KPPS
100KPPS
Set the counting speed
of the LD62D with the
switch setting.
10KPPS
Since the LD62D uses
32-bit signed binary
values, sequence
program needs to be
changed.
32-bit signed binary
(-2147483648 to 2147483647)
UP/DOWN preset counter + ring counter function
Minimum count pulse width, duty ratio: 50%
–
2
(500KPPS)
–
1
Performance specifications of 1 channel
10K
(10KPPS
or less)
EIA Standard RS-422-A differential line driver level
(AM26LS31 [manufactured by Texas Instruments] or equivalent)
Type
1
(Unit : s)
(Minimum phase difference in
2-phase input 0.5 s)
5
(200KPPS)
2.5 2.5
(Unit : s)
(Minimum phase difference in
2-phase input 1.25 s)
Counter
10
(100KPPS)
–
5
5
(Unit : s)
(Minimum phase difference in
2-phase input 2.5 s)
100
100
(10KPPS)
1-phase
input
50 50
(Unit : s)
(1-phase input)
142
(10KPPS)
2-phase
input
71 71
(Unit : s)
(2-phase input)
6 - 16
The number of occupied
I/O points is changed to
16 points.
1-phase input, 2-phase input
Signal level
(A, B)
Counting
range
Precautions for
replacement
2 channels
Phase
Counting
speed
(maximum)
Compatibility
A1SD62D(-S1)
Number of channels
: Partial change required, ×: Incompatible
50 50
(Unit : s)
(Minimum phase difference in
2-phase input 25 s)