Explicit Messaging Quick Start

 

 

 

 

Integer File N10

High Byte

 

Low Byte

N10:0

TXID= 0x01

 

COMMAND= 0x01

 

 

 

 

N10:1

PORT= 0x00

 

SIZE OF DATA FIELD= 0x06

 

 

 

 

N10:2

SERVICE= 0x0E (GET)

 

MacID= 0x04

 

 

 

 

N10:3

 

CLASS= 0x68

 

 

 

N10:4

 

INSTANCE= 0x01

 

 

 

N10:5

 

ATTRIBUTE= 0x09

 

 

 

 

After the N10 file is set, B3:0/0 can be set high to send the explicit message to the scanner card. After bit I:3/15 is set by the PLC, the message can be viewed by setting B3:0/2 high which copies the M1: file to the N11: file.

The response from the drive should resemble the following.

Figure 23: PLC Configuration Example 1

The following table reflects the results of the Index 0 Velocity example. Note that the Low Data Word is 1000 (0x3E8), the velocity requested.

Integer File N11

High Byte

Low Byte

N11:0

TXID=0x01

COMMAND=0x01

 

 

 

N11:1

PORT=0x00

SIZE OF DATA FIELD=0x04

 

 

 

N11:2

SERVICE=0x8E (Successful Response)

MacID=0x04

 

 

 

N11:3

LOW DATA WORD = 0x3E8

 

 

N11:4

HIGH DATA WORD = 0x00

 

 

 

Example 2 Write Index 1 Velocity

This example will show how to use explicit messaging to write the current index velocity to an Ei-DN drive.

Assume the drive configuration for example 1.

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Emerson 400501-08 manual Example 2 Write Index 1 Velocity, Integer File N11 High Byte Low Byte