Rockwell-automation 20-750-DNET PowerFlex DeviceNet Option Module Manual de usuario descargar pdf (Pagina 66)

66 Rockwell Automation Publication 750COM-UM002B-EN-P - October 2012

Chapter 6 Using Explicit Messaging

About Explicit Messaging

Explicit Messaging is used to transfer data that does not require continuous

updates. With Explicit Messaging, you can configure and monitor a slave device’s

parameters on the network.

Table 4 - Explicit Messaging Class Code Compatibility with PowerFlex 750-Series Drive

IMPORTANT

When an explicit message is performed, by default no connection is made since it

is an ‘unconnected’ message. When timing of the message transaction is

important, you can create a dedicated message connection between the

controller and drive by checking the ‘Connected’ box on the Communications tab

message configuration dialog box during message setup. These message

connections are in addition to the I/O connection. However, the trade off for more

message connections is decreased network performance. If your application

cannot tolerate this, do not check the ‘Connected’ box, which is recommended.

TIP

To message to another device in a different drive port, see the Instance table in

Appendix C:

• DPI Parameter Object section on page 109

for Device parameters.

• Host DPI Parameter Object section on page 123

for Host parameters.

In the Message Configuration dialog box, set the Instance field to an

appropriate value within the range listed for the port in which the device

resides.

IMPORTANT

PowerFlex 750-Series drives have explicit messaging limitations. Table 4 shows

the DeviceNet Object Class code compatibilities for these drives.

DeviceNet Object Class Code Compatibility Explicit Messaging Function

Parameter Object 0x0F No Single parameter reads/writes

DPI Parameter Object 0x93 Yes

(1)

with limitations

(1) Enables access to drive parameters (Port 0), DPI device parameters (Ports 1…6 only), and Host parameters (Ports 7…14 only). For

example, DPI Parameter Object Class code 0x93 can access a Safe Speed Monitor option module in Port 6. However, Class code 0x93

cannot access, for example, the Host parameters in a 24V I/O option module in Port 5. See DPI Parameter Object

on page 109 for

instance (parameter) numbering.

Single and scattered parameter reads/writes

Host DPI Parameter Object 0x9F Yes

(2)

with limitations

(2) Enables access to drive parameters (Port 0) and Host parameters for all ports (1…14). Host DPI Parameter Object Class code 0x9F

cannot access DPI (device) parameters. For example, if a 20-750-DNET option module is in Port 4, its Host parameters can be

accessed, but not its DPI (device) parameters. See Host DPI Parameter Object

on page 123 for instance (parameter) numbering.

Single and scattered parameter reads/writes

1 2 ... 61 62 63 64 65 66 67 68 69 70 71 ... 143 144

Comentarios a estos manuales

Sin comentarios

Rockwell-automation 20-750-DNET PowerFlex DeviceNet Option Module Manual de usuario Pagina 66

Comentarios a estos manuales

Relacionado con productos y manuales para Equipo Rockwell-automation 20-750-DNET PowerFlex DeviceNet Option Module