Q3:
How
are
the
local
registers
mapped
to
the
polled
data
in
a
MDC
‐
700?
A3:
Only
the
function
code
01/02/03/04
can
be
used
in
the
polling
definition
section
in
config.csv
file.
01:
Read
Coil
Status
(Read
DO)
02:
Read
Input
Status
(Read
DI)
03:
Read
Holding
Registers
(Read
AO)
04:
Read
Input
Registers
(Read
AI)
Refer
to
the
example
below,
UseComPort
SlaveModbusID
FunctionCode RegStartAddr RegCount
1
1
1
0
8
1
1
2
0
8
2
1
1
0
4
2
2
2
0
4
2
3
3
0
4
2
4
4
0
4
The
MDC
‐
700
will
sort
the
order
of
polling
data
by
COM
port
number
and
the
sequence
of
polling
definition;
and
then
map
the
local
registers
corresponding
to
the
data
type
(DI/DO/AI/AO)
by
the
order
of
polling
data.
So
the
data
comes
from
different
slave
devices
with
the
same
type
will
be
saved
in
continuous
registers,
and
a
Modbus
mater
device
and
read
the
data
on
a
variety
of
slave
devices
with
one
Modbus
command.
Read
DO
00000:00007
00008:00011
Read
DI
10000:10007
10008:10011
Read
AO
40000:40003
Read
AI
30000:30003
COM1
Read
DO:
00000:00007
Read
DI:
10000:10007
COM2
Read
DO:
00000:00003
Read
DI:
10000:10003
Read
AO:
40000:40003
Read
AI:
30000:30003
Copyright
©
2014
ICP
DAS
Co.,
Ltd.
All
Rights
Reserved.
∗
E
‐
mail:
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