Communication-capable Circuit Breakers

WL Circuit Breaker

Function 04: Read Input Registers

Function

This function reads the Basic Data Registers from a COM16 slave. All three Basic Types (1, 2 and 3) are

 

 

supported. (see pages 3/11, 3/12 and 3/13 for Basic Data)

 

 

 

Start Address

Any Data Block register address that is valid for the currently selected Basic Type. If any other address is

 

specified, an Exception Code of 02 (Invalid Data Address) will be returned.

 

 

 

Quantity of

If “Quantity of Registers” is not in the range of 1 to 125, an Exception Code of 03 (Invalid Data Value) will be

Registers

returned. If the “Quantity of Registers” specified attempts to read beyond the last register of the currently

 

selected Basic Type, an Exception Code 02 (Invalid Data Address) will be returned.

 

 

 

Function 05: Write Single Coil

Function

This function sets the state of a single Control bit or Extra flag in a COM16 slave.

 

 

 

 

Bit Address

Any value from 0000 hex to 000F hex. If any other address is specified, an Exception Code of 02 (Invalid Data

 

Address) will be returned.

 

 

 

Bit status

The following two values are valid as the Bit Status:

 

FF00H set bit

 

0000H clear bit

 

If any other value is specified, an Exception Code of 03 (Invalid Data Value) will be returned.

 

 

 

Function 07: Read Exception Status

 

Function

 

This function reads the state of eight Exception Status bits from the COM16 slave.

 

 

 

 

The bits are defined in Table 3-1.

 

 

 

 

 

 

 

 

 

 

 

Bit Number

WL

 

 

0

Set = Inspect breaker contacts*

 

 

1

Set = Communication with trip unit is OK

 

 

2

Set = COM16 is OK

 

 

3

not defined, always zero

 

 

4

not defined, always zero

 

 

5

not defined, always zero

 

 

6

not defined, always zero

 

7

not defined, always zero

 

Table 3-1

 

 

 

 

*Refer to the Operator's Manual for proper procedure. (Only for WL ANSI / UL 1066 version.)

3/4

WL MODBUS Communication and Electronic Accessories • January 2005

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Siemens UL 489, UL1066 Function 04 Read Input Registers, Function 05 Write Single Coil, Function 07 Read Exception Status

UL 489, UL1066 specifications

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