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11 INSTRUCTIONS AND FUNCTIONS
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(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 higher 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 address
and reading/writing operations between the PLC CPU and special function module
are performed using the FROM/TO instructions. When reading/writing from the
special function module's buffer memory to the communication module or vice versa,
the operation is performed in units of 8 bits (1 byte) per address.
The addresses to specify in the communication module (hexadecimal) are obtained
by the following conversion from addresses for the FROM/TO instructions.
Specified address
= convert
(hexadecimal)
Example : When specifying address 1 of the FROM/TO instruction (the preset value of
CH.1) of the type AD61 high-speed counter module.
Specified
address 82
See Appendix for the head address of each special function module
Y
Y
X/Y
00
20
30
to
to
to
1F
2F
4F
Y
Y
X/Y
400
420
430
to
to
to
41F
42F
44F
(address for the
{
}
into a hexadecimal
FROM/TO
number
instruction x 2)
FROM/TO instruction
=
address 0 × 2, 1
H
H
Since the last address is 44F
the special function module number is "44
Y
Y
50
70
to
to
6F
8F
Y
Y
450
470
to
to
46F
48F
the starting address
[
+
of each module
starting
+
× 2
address 80
H
MELSEC-Q
,
H
."
H
]
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