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6 data format, 7 address map, Data format -4 – Yokogawa EJX930A User Manual

Page 35: Address map -4

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<5. Modbus Communication>

5-4

IM 01C25R05-01EN

5.6 Data format

(1) USIGN INTEGER FORMAT
This format is used for integer data.

There are a number of 8 bit values that are stored in

16 bit registers. The 8 bit value is stored in the Least

Significant Byte of the 16 bit register. E.g. 0x24 is

stored as 0x0024.

(2) IEEE 754 FLOATING POINT FORMAT
Floating point values are stored as single precision

IEEE 754 floating point numbers. Since

IEEE 754 floating point numbers are 32 bits long.

Data is stored in the order of MSB (Most significant

byte) first.

E.g. 100.25 is stored as 0x42C88000.

(3) DATE FORMAT
This format is used for date information.

Date: DD, Month: MM, Year: YY is stored as

0x00DDMMYY.

Year: YY means the offset year from Year 1900.

E.g. 30th September 2013 is stored as

0x001E0971.

5.7 Address Map

Address map consists of Basic Information and

Detail Information.

Category

Address Type

Address

(Decimal)

Basic Information Coils

0003 to 0033

Discrete Inputs

0050 to 0075

Input Registers /

Holding Registers

0001 to 0454

Detail Information Coils

1001 to 1005

Discrete Inputs

1001 to 1088

Input Registers

1001 to 1316

Holding Registers

1001 to 2117

NOTE

• Some data is mapped in both area of Basic

Information and Detail Information.

• Enumeration table list is described

commonly both for Basic Information and

Detail Information.

• The data of Input Register and Holding

Register in Basic Information area can be

read by both function codes.

• In order to access 0001 parameter, set 0000

in communication frame.

• The return value is uncertain when

communicated to address which is not

written in the map.

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