Onicon D-100 Dualnet Manual de usuario descargar pdf (Pagina 19)

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D-100 Dual Network Interface Installation Guide 07/14 - 1015 Page 19

SECTION 3.0: MODBUS MEMORY MAP

ONICON displays equipped with MODBUS serial communications provide volume rate data, and

totalized volume data in a variety of engineering units. You select the engineering units you wish to

use by mapping to the appropriate registers.

Also supplied with your D-100 is a document titled “Recommended MODBUS Conguration Data”.

This document is different for each display. It provides a suggested list of registers to use. The

recommendations are based on the calibration of the ow meter and the programming of units and

multipliers displayed on the D-100.

3.1 MODBUS REGISTER FORMAT AND NETWORKING INFORMATION

1. All registers are 16 bit MODBUS Holding Registers.

2. MODBUS Holding Registers are used in 4 different ways.

A. As an Analog Value: In some cases these values are scaled

by multiplying the register contents by a xed multiplier.

B. As a status indicator where the register value can only

be “1” or “2”.

C. As a mode indicator where the value indicates current operating mode

such as “1” = single, “2” = dual, or “3” = bi-directional.

D. As a control register where the host can write a value to reset total(s).

3. Registers 40001 through 40068 are unsigned integer registers (0 to 65,535) except for 40024

and 40025. These are 16 bit signed integer values (-32,768 to +32,767). Registers 41003

through 41081 are 32 bit single precision oating point values. 41001, 41002 and 41065

through 41069 are unsigned integer registers.

4. D-100 MODBUS register addresses are formattted as follows:

Example: address 40001

4 = Holding register

0001 = Address that corresponds to memory location 0000

5. MODBUS function codes supported:

CODE DESCRIPTION

03 Read Holding Registers

06 Preset Single Registers

16 Preset Multiple Registers

17 Report Slave ID

IMPORTANT NOTE

ONICON provides data in integer and oating point format. We recommend the use of

oating point registers to transmit data to the network. The use of oating point data

eliminates the need for scaling and additional mathematical operations to totalize energy

and ow.

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Onicon D-100 Dualnet Manual de usuario Pagina 19