4.
FAQ
Q1:
What
are
the
maximum
numbers
of
polling
definition
and
local
register?
A1:
The
maximum
number
of
polling
definition
in
a
MDC
‐
700
is
240,
each
definition
can
access
up
to
64
registers.
Each
of
the
four
tables
(DI/DO/AI/DO)
can
store
up
to
9600
registers
for
polled
data.
Q2:
What
is
the
maximum
number
of
registers
can
be
accessed
in
one
Modbus
command
from
a
Modbus
master
device?
A2:
By
following
the
Modbus
protocol,
the
maximum
amount
of
registers
that
one
command
can
access
is
255
of
function
code
01
and
02,
and
126
of
function
code
03
and
04.
Copyright
©
2014
ICP
DAS
Co.,
Ltd.
All
Rights
Reserved.
∗
E
‐
mail:
‐
29
‐
