Rockwell-automation 1769-ADN Compact I/O 1769-ADN DeviceNet Adapter Instrukcja Użytkownika Pobierz pdf (Strona 159)

1 Publication 1769-UM001B-EN-P - October 2002

Appendix

Explicit Messaging Application Examples

1756-DNB Explicit

Messaging Application

Example

The following explicit messaging application example details a

1756-DNB DeviceNet scanner controlling 1769 Compact I/O via

DeviceNet and the 1769-ADN DeviceNet Adapter.

While explicit messages are not required when using 1769 I/O on

DeviceNet, these messages allow you to read status information from

the 1769-ADN adapter and 1769 I/O modules as well as write 1769

I/O module configuration parameters while the system is running.

These operations are not required when using the 1769-ADN adapter,

but may be necessary from an application view if, for example, you

need to modify the configuration of an I/O module while the system

is running. Also, in the event of failure, you may need to read status

information from the 1769-ADN or I/O module from a remote

terminal.

Before attempting any explicit messages to a 1769-ADN, the adapter

must be configured in a DeviceNet scanner’s scanlist. This example

uses a 1756-DNB DeviceNet scanner in slot 1 of a 1756 ControlLogix

chassis. The Logix5550 controller is in slot 0. RSLogix 5000

programming software is used to program the Logix5550 controller

and RSNetworx for DeviceNet is used to schedule I/O on DeviceNet.

We’ll cover the following list of message commands in this example:

• Get 1769-ADN Status

• Get 1769 I/O Module Status

• Get 1769 I/O Module Configuration File Size

• Set 1769 I/O Module Configuration

• Save 1769 I/O Module Configuration

• Get 1769 I/O Module Configuration

Get 1769-ADN Status

Use a “CIP Generic” MSG instruction to send any explicit message to a

1769-ADN or 1769 I/O module from a Logix5550 controller via a

1756-DNB DeviceNet scanner. You’ll see in the ladder logic example

to follow, a CIP Generic message is sent to the 1756-DNB scanner and

ultimately to the 1769-ADN.

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