Prosoft-technology MVI71-MCM Bedienungsanleitung PDF herunterladen (Seite 68)

MVI71-MCM ♦ PLC Platform Reference

Modbus Communication Module

Page 68 of 111 ProSoft Technology, Inc.

December 28, 2007

Ladder logic can be written to override the value in the slave status table. It can

disable (state value of 3) by sending a special block of data from the processor to

the slave. Port 1 slaves are disabled using block 3000, and Port 2 slaves are

disabled using block 3100. Each block contains the slave node addresses to

disable. The structure of the block is displayed in the following table:

Offset Description Length

0 3000 or 3100 1

1 Number of Slaves in Block 1

2 to 61 Slave indexes 60

62 to 63 Spare 2

The module will respond with a block with the same identification code received

and indicate the number of slaves acted on with the block. The format of this

response block is displayed in the following table:

Offset Description Length

0 3000 or 3100 1

1 Write Block ID 1

2 Number of slaves processed 1

3 to 63 Spare 61

Ladder logic can be written to override the value in the slave status table to

enable the slave (state value of 1) by sending a special block. Port 1 slaves are

enabled using block 3001, and Port 2 slaves are enabled using block 3101. Each

block contains the slave node addresses to enable. The following table describes

the format for this block.

Offset Description Length

0 3001 or 3101 1

1 Number of Slaves in Block 1

2 to 61 Slave indexes 60

62 to 63 Spare 2

The module will respond with a block with the same identification code received

and indicate the number of slaves acted on with the block. The format of this

response block is displayed in the following table:

Offset Description Length

0 Reserved 1

1 Write Block ID 1

2 Number of slaves processed 1

3 to 63 Spare 61

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 ... 110 111

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Prosoft-technology MVI71-MCM Bedienungsanleitung Seite 68