Publication 1756-UM514B-EN-P - February 2003
Using RSLogix 5000 in Remote I/O and Block Transfer Applications 9-9
Using RSLogix 5000 in
1756-DHRIO Module Block
Transfer Applications
RSLogix 5000 automatically generates allocates a portion of a
controller’s memory for the data collected in remote I/O applications.
In block transfer applications, however, the data transferred between
the controller and the remotely-located modules (e.g. analog or
specialty I/O modules) is greater than the software can allocate
memory for. You must generate tags (i.e. space in the controller’s
memory) for the data transferred. This section explains how to
configure a block transfer application.
The process for block transfers with the 1756-DHRIO module is
similar to the process for remote I/O, except that block transfer
applications require several additional steps, including the use of a
message instruction to read data from or write data.
When you use the 1756-DHRIO module for block transfers, you must
follow these basic steps:
1. Add the 1756-DHRIO module to the project.
2. Configure the 1756-DHRIO module, including setting the
appropriate channels for Remote I/O.
3. Add a remote I/O adapter to the project.
4. Configure the remote I/O adapter.
5. Add remote I/O modules to the project.
6. Configure remote I/O modules.
7. Set up the Block Transfer (Read or Write) message instruction in
the project’s ladder logic.
8. Download the project to the controller.
9. Begin application operation (i.e. go online).
10. If necessary, change the configuration for all modules and
adapters in the project.
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