Rockwell-automation 20-750-DNET PowerFlex DeviceNet Option Module Manual de usuario descargar pdf (Pagina 77)

Rockwell Automation Publication 750COM-UM002B-EN-P - October 2012 77

Using Explicit Messaging Chapter 6

ControlLogix Controller Example Scattered Write Request Data

In this message example, we use the data structure in Figure 23 in the source tag

(Scattered_Write_Request) to write new values to these 32-bit REAL (floating

point) parameters:

See DPI Parameter Object

on page 109 (Class code 0x93) or Host DPI

Parameter Object on page 123 (Class code 0x9F) for parameter numbering.

Figure 23

shows the parameter values which, in this example, have been

converted using a UDDT to correctly write their values. COP (Copy)

instructions could have been used for this purpose instead of a UDDT. If the

parameters being written to are 32-bit integers, do not COP the data to a REAL

tag.

Figure 23 - Example Scattered Write Request Converted Data

ControlLogix Controller Example Scattered Write Response Data

The results of the message appear in the destination tag named

Scattered_Write_Response (Figure 24

). Values of ‘0’ indicate no errors occurred.

Figure 24 - Example Scattered Write Response Data

PowerFlex 750-Series Drive Parameter Write Value

536 - [Accel Time 2] 11.1 Sec

538 - [Decel Time 2] 22.2 Sec

575 - [Preset Speed 5] 33.3 Hz

576 - [Preset Speed 6] 44.4 Hz

577 - [Preset Speed 7] 55.5 Hz

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Rockwell-automation 20-750-DNET PowerFlex DeviceNet Option Module Manual de usuario Pagina 77