4

PROFIBUS Slave Module COMMREQ Reference

The PROFIBUS Slave module supports the following COMMREQ tasks and responses.

Task

Name

Description

Page No.

3

Get Slave Status

Retrieves detailed status information for the Slave. 4-7

5

Read Module Header Retrieves module header information.

4-10

6

Clear Counters

Clears counters in ReadModuleHeader

4-12

Get Slave Status COMMREQ (3)

The Get Slave Status COMMREQ retrieves detailed status information for the slave module from the 16-bit slave status word. The starting address of this word is configured as Status/Firmware ID Address in the PROFIBUS Slave module software configuration. For details, refer to “Parameters” in chapter 3.

Memory Types

The following table lists the memory types that can be used for the Status Block and

Reply Data areas.

COMMREQ Status Word Memory Type Codes

Memory Type

Memory Type

Decimal

Abbreviation

code to enter

 

 

 

 

%I

Discrete input table (BYTE mode)

16

%Q

Discrete output table (BYTE mode)

18

%R

Register memory

8

%AI

Analog input table

10

%AQ

Analog output table

12

%T

Discrete temporary memory (BYTE)

20

%M

Discrete internal memory (BYTE)

22

Get Slave Status Command Block – Basic Example

Get Slave status for Device

Return the COMMREQ status words to %R10—%R13.

Return the Slave status to %R251-%R259.

 

Word

Dec (Hex)

Definition

 

 

 

 

 

 

 

 

Word 1

4

(0004)

Length of command Data Block

 

 

Word 2

0

(0000)

Always 0 (no-wait mode request)

 

 

Word 3

8

(0008)

Memory type of COMMREQ status word (%R)

 

 

Word 4

9

(0009)

COMMREQ status word address minus 1 (%R10)

 

 

Word 5

0

(0000)

Reserved

 

 

Word 6

0

(0000)

Reserved

 

 

Word 7

3

(0003)

Get Module Status command code.

 

 

Word 8

8

(0008)

Memory type to write response (%R)

 

 

Word 9

250

(00FA)

Starting Address to write response (response written to %R251)

 

 

Word 10

5

(0005)

Maximum size of response area. Must be 2 words or more, or an error

 

 

 

 

will be reported in the COMMREQ status and the Get Slave Status

 

 

 

 

 

request will be ignored.

 

GFK-2193A

Chapter 4 Status and Diagnostics

4-7

Page 24
Image 24
GE GFK-2193A user manual Profibus Slave Module Commreq Reference, Get Slave Status Commreq, Memory Types

GFK-2193A specifications

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