Rockwell-automation 20G PowerFlex 755 Drive Embedded EtherNet/IP Adapt Manual de usuario descargar pdf (Pagina 101)

Rockwell Automation Publication 750COM-UM001E-EN-P - October 2013 101

Using Explicit Messaging Chapter 6

ControlLogix Controller Example Ladder Logic Program to Write

Multiple Parameters

A Scattered Write message is used to write to multiple parameters. This write

message example writes the following values to these five 32-bit REAL (floating

point) parameters in a PowerFlex 750-Series drive:

See DPI Parameter Object

on page 148 (Class code 0x93) or Host DPI

Parameter Object on page 162 (Class code 0x9F) for parameter numbering.

Table 8 - Example Controller Tags to Write Multiple Parameters

Figure 28 - Example Ladder Logic to Write Multiple Parameters

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

Operand Controller Tags for Scattered Write Message Data Type

XIC Execute_Scattered_Write_Message BOOL

MSG Scattered_Write_Message MESSAGE

IMPORTANT

If the explicit message scattered write must be written continuously, then use

a separate explicit message single write for each parameter using DPI

Parameter Object Class code 0x93 and attribute A (see page 97

). Attribute A

writes to RAM—not NVS (EEPROM) memory. This example scattered write

message using attribute 0 writes to NVS. Over time, continuous writes will

exceed the EEPROM life cycle and cause the drive to malfunction.

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Rockwell-automation 20G PowerFlex 755 Drive Embedded EtherNet/IP Adapt Manual de usuario Pagina 101