Rockwell-automation 1761-NET-DNI DeviceNet Interface (DNI) Manual de usuario descargar pdf (Pagina 71)

Publication 1761-UM005B-EN-P - October 2006

Application Examples 71

Example Ladder Logic

The ladder program example is used to monitor the integrity of the

communications link with the DNI. If something happens and

communications are lost (cable is cut or removed, DNI loses power or

faults) this logic detects that condition. The user can program the

controller to respond to a loss of communications, if desired.

The example ladder logic shown below is available for download

from http://www.ab.com/micrologix. The sample is compatible with

RSLogix 500 programming software. The file name is DNI I-O.RSS and

contains two programs.

• DNI MicroLogix Heartbeat Logic, DNI I-O.RSS Ladder 2 - Main

Program

Monitors the communications link for integrity. This is

considered to be part of the Heartbeat logic associated with the

DNI.

• DNI - COS (change of state) I/O Messaging, DNI I-O.RSS Ladder

6 - COS ML DNI

Moves the Input and Output data inside the controller, for

correct operation with the DNI.

16 18 DF1 Baud Rate 0…5:

0: 38,400

1: 19,200

2: 9600

3: 4800

4: 2400

5: 1200

Series A: 2 = 9600

Series B: 1 = 19,200

0 = 38,400

1 19 DeviceNet Autobaud Disabled (0) or Enabled (1) Enabled (1) Enabled (1)

17 Not

Applicable

DNI Mode Standby (0) or

Operational (1)

Operational (1) Operational (1)

Parameter Number Description Range Default Value For this Example,

ENTER

Series A Series B

1 2 ... 66 67 68 69 70 71 72 73 74 75 76 ... 99 100

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Rockwell-automation 1761-NET-DNI DeviceNet Interface (DNI) Manual de usuario Pagina 71