Manual

11
IM 04L41B01-19E
I/O Buffer and Data Mapping
Amasterdevicesuchas a PLCaccessesinternaldataof theDXviathe"Input buffer"
and"Outputbuffer"oftheDX."Input"representsaninputtothemaster,while"Output"
represents an output from the master.
Mapping Method of the I/O buffer
The "Inputbuffer"and"Outputbuffer"oftheDXforPROFIBUS-DPcommunicationhas
128byteseach.Dataislaidoutasdescribedinthefollowingtable.Datalayoutcannot
bechanged.
Buffer Application Description
Input Reading
measurement channel
data and computation
channel data
Locates all the measurement channel data from the top of
thebuf
fer.Locatesasmuchcomputationchanneldataas
possibleintheremainingpartofthebuffer.
Buffer Application Description
Output Writing
communication input
data
Locates
asmuchcommunicationinputdataaspossible.
Data Count and Data Type
TheDXdatacountisasfollows:
Model Measurement channel Computation channel Communication input
data
Count Number Count Number Count Number
DX1002
2 001, 002 1
2 101 to 112 24 C01 to C24
DX1004 4 001 to 004
DX1006
6 001to
006 24 101 to 124
DX1012 12 001 to 012
DX2004 4 001 to 004 1
2 101 to 112 60 C01toC32
(C33toC60)
*1
DX2008 8 001to008
DX2010 10 001 to 010 60 101
to 127
(128to160)
*1
DX2020 20 001 to 020 101 to 122
(123to160)
*1
DX2030 30 001to030 101 to 117
(118to160)
*1
DX2040 40 001 to 040 101 to 112
(113to160)
*1
DX2048 48 001to048 101to108
(109to160)
*1
*1DatainparenthesescannotbelocatedinabufferbecauseitexceedsthecapacityoftheI/O
buffer.
Note
The communication input data for C01 to C24 (on the DX1000) or for C01 to C32 (on the
DX2000)isreservedforPROFIBUS-DP.
Youcannotwritetothesedatanumbersthroughothermeans(suchasModbus,EtherNet/IP,or
communication commands).