Specifications

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Allen-Bradley DH+/DH-485 Device Driver Help

AMCI-1561 AMCI Series 1561 Resolver Module

SLC500 Slot Configuration

Slot Configuration

SLC500 models (modular I/O racks) need to be configured for use with the AB DH+ driver if the I/O is to be accessed

by the driver. Up to 30 slots can be configured per device.

To use the slot configuration dialog:

1. Left-click on the row in the Slot/module list box to select the slot to configure.

2. Select a module from the Available modules list box by left-clicking on it.

3. Finally, click the Add button to add the module.

Note: You can remove a module by first selecting the slot in the slot/module list box and then clicking the Remove

button. The available module selections are the same as those in the Allen Bradley APS software.

Knowledge of the number of input and output words in each slot is necessary for the driver to correctly address the I/O.

Only the number of input and output words in slots (up to the slot of interest) is needed to address I/O in that slot. For

example, if you are only going to access slot 3, you would have to configure slots 1, 2 and 3.

See Also: Modular I/O Selection Guide

Optimizing Your AB Data Highway Communications

The Allen-Bradley DH+ driver has been designed to provide the best performance with the least amount of impact on

the system's overall performance. While the Allen-Bradley DH+ driver is fast, there are a couple of guidelines that can

be used in order to control and optimize the application and gain maximum performance.

Our server refers to communications protocols like Allen-Bradley DH+ as a channel. Each channel defined in the

application represents a separate path of execution in the server. Once a channel has been defined, a series of devices

must then be defined under that channel. Each of these devices represents a single Allen-Bradley PLC from which data

will be collected. While this approach to defining the application will provide a high level of performance, it won't take

full advantage of the Allen-Bradley DH+ driver or the network. An example of how the application may appear when

configured using a single channel is shown below.

Each device appears under a single XXXX

channel. In this configuration, the driver

must move from one device to the next

as quickly as possible in order to gather

information at an effective rate. As more

devices are added or more information is

requested from a single device, the

overall update rate begins to suffer.

If the AB DH+ driver could only define one single channel, then the example shown above would be the only option

available; however, the AB DH+ driver can define up to 16 channels. Using multiple channels distributes the data

collection workload by simultaneously issuing multiple requests to the network. An example of how the same application

may appear when configured using multiple channels to improve performance is shown below.