Rockwell-automation 1769-ADN Compact I/O 1769-ADN DeviceNet Adapter Uživatelský manuál stáhnout pdf (Strana 162)

Publication 1769-UM001B-EN-P - October 2002

B-4 Explicit Messaging Application Examples

Get 1769 I/O Module Status

Use a “CIP Generic” MSG instruction to send the Get 1769 I/O Module

Status explicit message from a Logix5550 controller via a 1756-DNB

scanner on DeviceNet. 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 and the 1769 I/O module in slot 10.

Use a “Single Parameter Read” MSG instruction for the Get 1769 I/O

Module Status message, where one word of status information is read

from the 1769 I/O module in slot 10. The user program consists of a

single rung containing a MSG instruction to accomplish the Get 1769

I/O Module Status.

The following correlates the CIP Generic message terminology with

DeviceNet command terminology and illustrates the values needed

specifically for the Get 1769 I/O Module Status message:

Values (Hexadecimal) DeviceNet Terminology CIP Generic Terminology

e Service

Service Code

30c Class

Object Type

10 (decimal) Instance

Object ID

c Attribute

Object Attribute

1 Service specifies the type of request being delivered. “e” hexadecimal is a “Single Parameter Read”.

2 Class specifies the desired DeviceNet class. “30c” hexadecimal is the class code for the object representing

1769 I/O.

3 Instance represents the slot number of the I/O module from which we want status information. “10” decimal

in this example is the analog output module in slot 10.

4 Attribute identifies the specific characteristics of the object towards which the transaction is directed.

“c” hexadecimal means Module Status.

1 2 ... 157 158 159 160 161 162 163 164 165 166 167 ... 203 204

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Rockwell-automation 1769-ADN Compact I/O 1769-ADN DeviceNet Adapter Uživatelský manuál Strana 162