Operating instructions

Reference PTQ-MCM ♦ Quantum / Unity Platform

Modbus Communication Module

ProSoft Technology, Inc. Page 103 of 139

April 29, 2008

Command Control Word Description

30004 Block response word 2

30005 Block response word 3

… …

30064 Block response word 62

The module recognizes that there is a new block request when it identifies that

the block sequence number has changed. if the block ID is valid, the module will

process the block and copy the response to the input command control area (3x

for Quantum / Unity or %IW for Unity). The module will increment the block

sequence number by one, as shown in the following illustration.

New block

sequence

number?

Valid block ID

request?

Process the block

Copy block response

to input command

control area with

incremented block

sequence number

Yes

Write Block - Command Control

Offset Description Length

0 5001 to 5006 or 5101 to 5106 1

1 Command index 1

2 Command index 1

3 Command index 1

4 Command index 1

5 Command index 1

6 Command index 1

7 to 63 Spare