ProSoft Technology ProLinx S3964R Manual de usuario descargar pdf (Pagina 46)

S3964R ♦ ProLinx Gateway Functional Overview

Siemens 3964R Protocol Driver Manual

Page 46 of 64 ProSoft Technology, Inc.

April 14, 2009

5.4.3 Example 3964R DB-SEND of data to Modbus TCP/IP device

Now let's say the 3964R device needs to send data to the Modbus TCP/IP

device. The 3964R device issues a DB-SEND. The Modbus TCP/IP device

needs to continually poll the ProLinx for an indication of new data.

Use a Modbus Function Code 3 to read header data from the ProLinx R

ECEIVE

BUFFER

. The 3964R device issues a DB-SEND telegram to the ProLinx. The

ProLinx device will automatically respond with a DB-SEND Response telegram

back to the 3964R device. The ProLinx will copy the DB-SEND telegram into the

ECEIVE BUFFER. Use a Modbus Function Code 3 to read the data from the

ProLinx R

ECEIVE BUFFER

1 Continually watch G for a change in value.

2 Verify the Job Code in L, to make sure this is new DB-SEND data.

3 If the Job Code is 0x1141, then read the RECEIVE BUFFER. CHECK J FOR

ERRORS

, AND K AND L FOR DATA.

4 Continually poll the error code, J to verify no errors.

5 Set B to the value in G.

Transmit Buffer

Receive Buffer

Item Address Transmit Value

Item Address Receive Value

A (<port#> * 600) + 300 Sequence

Number

G <port#> * 600 Sequence Number

B ((<port#> * 600) + 300) + 1 Last Receive

Sequence

Number

H (<port#> * 600) + 1 Last Transmit

Sequence Number

C ((<port#> * 600) + 300) + 2 Blocks

Remaining

I (<port#> * 600) + 2 Blocks Remaining

D ((<port#> * 600) + 300) + 3 Reserved

J (<port#> * 600) + 3 Error Code

E ((<port#> * 600) + 300) + 4 Data Count

K (<port#> * 600) + 4 Data Count

F ((<port#> * 600) + 300) + 5

through ((<port#> * 600) +

300) + 299

Data

L (<port#> * 600) + 5

through (<port#> *

600) + 299

Data

Port 0 Receive Database (Results of DB-Fetch)

Here is an example of a RK512 DB-SEND initiated from the 3964R

Communication Partner on port 0. This example sends five words of data to the

Modbus TCP/IP device. The values for the five words of data are 11, 22, 33, 44,

and 55.

Word Value Description:

0 4

In this example, the Receive Sequence Number will increment from 3

to 4 when the DB-SEND message data has arrived. When this location

changes values, then it signals that new message data has been

received from the 3964R communication partner.

1 X

Transmit Sequence number. This number will not change when a DB-

SEND message has been received from the 3964R communication

partner.

2 0 Reserved.

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 63 64

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