ProSoft Technology MVI69-DFCM User Manual page 17

The module will recognize the request by receiving the special write block code and
respond with a read block with the following format:
Read Block – Read Slave Status
Offset Description
0 3002-3006 or 3102-3106
1 Write Block ID
2-61 Slave Poll Status Data
62 to n Spare (if present)
The sample ladder logic shows how to override the value in the slave status table to
disable slaves (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 below:
Write Block – Disable Slaves
Offset
0
1
2 to 61
62 to (n+1)
n=120, or 240 (if configured)
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 below:
Read Block – Disable Slaves
Offset Description
0 3000 or 3100
1 Write Block ID
2 Number of slaves processed
3 to (n+1) Spare
n=60, 120, or 240 (if configured)
The sample ladder logic explains how 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 format of the block is displayed below:
Write Block – Enable Slaves
Offset
0
1
2
ProSoft Technology, Inc.
MVI69-DFCM User Manual
June 24, 2004
Description
3000 or 3100
Number of slaves in block
Slave indexes
Spare
Description
3001 or 3101
Number of slaves in block
Slave indexes
Functional Overview
Length
1
1
60
Length
1
1
60
Length
1
1
1
Length
1
1
1
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