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I/o buffer and data mapping, Mapping method of the i/o buffer, Data count and data type – Yokogawa Removable Chassis DX1000N User Manual

Page 12

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IM 04L4B0-9E

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 buffer. 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

DX002

2

00, 002

2

0 to 2

24

C0 to C24

DX004

4

00 to 004

DX1006

6

001 to 006

24

0 to 24

DX02

2

00 to 02

DX2004

4

00 to 004

2

0 to 2

60

C01 to C32
(C33 to C60)

*

DX2008

8

001 to 008

DX200

0

00 to 00

60

0 to 27
(128 to 160)

*

DX2020

20

00 to 020

0 to 22
(123 to 160)

*

DX2030

30

001 to 030

0 to 7
(118 to 160)

*

DX2040

40

00 to 040

0 to 2
(113 to 160)

*

DX2048

48

001 to 048

101 to 108
(109 to 160)

*

*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).

This manual is related to the following products: