Modbus Holding Registers and Integra set up

Holding registers are used to store and display instrument configuration settings. All holding registers not listed in the table below should be considered as reserved for manufacturer use and no attempt should be made to modify their values.

The demand parameters may be viewed or changed using the Modbus protocol. Each parameter is held in the 4X registers. Modbus Function Code 03 is used to read the parameter and Function Code 16 is used to write.

Register

Parameter

Parameter

Modbus Start

Valid range

Mode

 

 

Number

Address Hex

 

 

 

 

 

High

Low

 

 

 

 

 

Byte

Byte

 

 

40001

1

Demand Time

00

00

0 only

r/w

40003

2

Demand Period

00

02

8,15,20,30 minutes.

r/w

40007

4

System Voltage

00

06

1V - 400kV

r/wp

40009

5

System Current

00

08

1-9999 A

r/wp

40011

6

System Type

00

0A

 

ro

40013

7

Relay Pulse Width

00

0C

3,5,10 (x20mS)

r/w

40015

8

Energy Reset

00

0E

0 only

wo

40023

12

Pulse Divisor

00

16

1,10,100,1000

r/w

40025

13

Password

00

18

0000-9999

r/w

40037

19

System Power

00

24

 

r/o

40041

21

Register Order

00

28

2141.0 only

wo

40299

150

Secondary Volts

01

2A

Min Vin-Max Vin

r/wp

r/w = read/write r/wp = read and write with password clearance ro = read only wo = write only

Password Settings marked r/wp require the instrument password to have been entered into the Password register before changes will be accepted. Once the instrument configuration has been modified, the password should be written to the password register again to protect the configuration from unauthorised or accidental change. Power cycling also restores protection. Reading the Password register returns 1 if the instrument is unprotected and 0 if it is protected from changes.

Demand Time is used to reset the demand period. A value of zero must be written to this register to accomplish this. Writing any other value will cause an error to be returned. Reading this register after instrument restart or resetting demand period gives the number of minutes of demand data up to a maximum of the demand period setting. For example, with 15 minute demand period, from reset the value will increment from zero every minute until it reaches 15. It will remain at this value until a subsequent reset occurs.

Demand Period The value written must be one of the following 8,15, 20 or 30 (minutes), otherwise an error will be returned.

System Type The System type address will display '1' for single phase 2 wire, '2' for 3 Phase 3 Wire, '3' for 3 Phase 4 Wire or 4 for single phase 3 wire.

Integra 1540, 1000, 0640, 0440, 0340, 0240 Issue 1 04/03

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Tyco 1540 manual Modbus Holding Registers and Integra set up, High Low Byte

1540 specifications

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