Beckhoff ET1200 User Manual download pdf (Page 12)

Overview

III-2 Slave Controller – ET1200 Hardware Description

1.1 Frame processing order

The ET1200 supports two ports (logical ports 0 and 1) or three ports (logical ports 0, 1, and 3). The

frame processing order of the ET1200 depends on the number of ports (logical port numbers are

used):

Table 2: Frame Processing Order

Number of Ports

Frame processing order

0→EtherCAT Processing Unit→1 / 1→0

0→EtherCAT Processing Unit→3 / 3→1 / 1→0

Figure 2 shows the frame processing in general:

Port 1

Auto-

Forwarder

Port 3

Auto-

Forwarder

Port 0

Auto-

Forwarder

Loopback function

EtherCAT

Processing Unit

Loopback function

ET1200

port 1 closed

port 1 open

port 3 open

port 3 closed

port 0 open

or all ports

closed

port 0 closed

Figure 2: Frame Processing

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 69 70

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Beckhoff ET1200 User Manual Page 12