Rockwell-automation 25-COMM-P PowerFlex PROFIBUS DPV1 Adapter Manual de usuario descargar pdf (Pagina 56)

56 Rockwell Automation Publication 520COM-UM004A-EN-E - November 2013

Chapter 7 Using Multi-Drive Mode

Multi-Drive Mode Example for Network

Benefits of Multi-drive mode include:

• Lower hardware costs. No need to purchase additional communication

adapters for daisy-chained drives.

• Reduces the network node count. For example, in Single-drive mode 30

drives would consume 30 nodes. In Multi-drive mode, 30 drives can be

connected in 6 nodes.

• Controller can control, monitor, and read/write parameters for all five

drives.

The trade-offs of Multi-drive mode include:

• If the PowerFlex 520-series drive with 25-COMM-P adapter is powered

down, then communications with the daisy-chained drives is disrupted

and the drives will take the appropriate communications loss action set in

each drive.

• Communications throughput to the daisy-chained drives will be slower

than if each drive was a separate node on PROFIBUS (Single-drive mode).

This is because the 25-COMM-P adapter must take the PROFIBUS data

for the other drives and sequentially send the respective data to each drive

over RS-485. The approximate additional throughput time for Logic

Command/Reference to be transmitted and received by each drive is:

IMPORTANT

For the examples in the chapter, we will use the PowerFlex 525 as a master

drive with four daisy-chained PowerFlex 4M drives.

Drive Additional Throughput Time

versus Single-Drive Mode

PowerFlex 525 0 ms

PowerFlex 525 plus 1 drive +24 ms

PowerFlex 525 plus 2 drives +48 ms

PowerFlex 525 plus 3 drives +72 ms

PowerFlex 525 plus 4 drives +96 ms

Esc

Sel

Up to 5 drives per node

PROFIBUS

Up to four daisy-chained PowerFlex drives

(PowerFlex 4M shown)

RS-485 cable

PowerFlex 525

with

25-COMM-P as

master drive

AK-U0-RJ45-TB2P connector with

terminating resistor (120 Ω)

AK-U0-RJ45-TB2P connector with

terminating resistor (120 Ω)

AK-U0-RJ45-TB2P

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