Rockwell-automation 25B PowerFlex 525 Embedded EtherNet/IP Adapter Uživatelský manuál stáhnout pdf (Strana 77)

Rockwell Automation Publication 520COM-UM001B-EN-E - March 2013 77

Using Explicit Messaging Chapter 6

CompactLogix 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 16-bit parameters in a

PowerFlex 525 drive:

Example Controller Tags to Write Multiple Parameters

Example Ladder Logic to Write Multiple Parameters

PowerFlex 525 Drive Parameters Write Value

A442 [Accel Time 2] 11.10 Sec

A443 [Decel time 2] 22.20 Sec

A415 [Preset Freq 5] 33.30 Hz

A416 [Preset Freq 6] 44.40 Hz

A417 [Preset Freq 7] 55.50 Hz

Operation Controller Tags for Scattered Write Message Data Types

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 CompactLogix –

Formatting a Messageto Write a Single Parameter on page 73). 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.

If you need to make frequent parameter changes using Explicit Messages, set

parameter C121 [Comm Write Mode] to 1 “RAM only”.

Execute_Scattered_Write_Message

Message

Message Control Scattered_Write_Message

MSG

1 2 ... 72 73 74 75 76 77 78 79 80 81 82 ... 165 166

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Rockwell-automation 25B PowerFlex 525 Embedded EtherNet/IP Adapter Uživatelský manuál Strana 77