Table of Contents
Advertisement
11 INSTRUCTIONS AND FUNCTIONS
11 - 209
(f) Module number of the special function module of a MELSECNET/10 remote
I/O station
The module number of the special function module of a MELSECNET/10
remote I/O station is always the two most significant digits of the 3-digit
expression of the last "I/O address seen from a remote I/O station."
Specify the module number using the last "I/O address seen from a remote
I/O station" regardless of the settings of the common parameters set at the
master station of the MELSECNET/10 remote I/O net.
I/O addresses seen from
a remote I/O station
Remote I/O
station No.1
I/O addresses set by
the common parameters
• The special function module's buffer memory contains 16 bits (one word) per one
address and reading/writing operations between the PLC CPU and special
function module are performed with the FROM/TO instruction.
When reading/writing from the special function module's buffer memory to the
communication module or vice versa, the operation is carried out in units of 8
bits (one byte) per one address.
The addresses to specify in the communication module (hexadecimal) are
obtained by the following conversion from addresses for the FROM/TO
instruction.
Specified address
= convert
(hexadecimal)
Example: When specifying address 1 of the FROM/TO instructions (the preset
value of CH.1) of the type AD61 high-speed counter module.
Specified
address 82H
See the Appendix for the starting address of each special function module.
Since the last address is 44F
the special function module number is "44
Y
Y
X/Y
Y
00
20
30
50
to
to
to
to
1F
2F
4F
6F
Y
Y
X/Y
Y
400
420
430
450
to
to
to
to
41F
42F
44F
46F
(address for the
{
}
into a hexadecimal
FROM/TO
number
instruction x 2)
FROM/TO instruction
=
address 0 x 2, 1H x 2
MELSEC-Q
,
H
Y
70
to
8F
Y
470
to
48F
the starting address
[
+
of each module
starting
+
address 80H
."
H
]
11 - 209
Advertisement
Table of Contents
