1 frame processing order, Frame processing order, Table 2: frame processing order – BECKHOFF ET1200 User Manual
Page 12: Figure 2: frame processing
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
2
0
→EtherCAT Processing Unit→1 / 1→0
3
0
→EtherCAT Processing Unit→3 / 3→1 / 1→0
Figure 2 shows the frame processing in general:
1
Port 1
A
u
to
-
F
o
rw
a
rd
e
r
1
Port 3
Auto-
Forwarder
Port 0
A
u
to
-
F
o
rw
a
rd
e
r
L
o
o
p
b
a
c
k
f
u
n
c
ti
o
n
EtherCAT
Processing Unit
Loopback function
L
o
o
p
b
a
c
k
f
u
n
c
ti
o
n
ET1200
p
o
rt
1
c
lo
s
e
d
p
o
rt
1
o
p
e
n
port 3 open
port 3 closed
p
o
rt
0
o
p
e
n
o
r
a
ll
p
o
rt
s
c
lo
s
e
d
p
o
rt
0
c
lo
s
e
d
Figure 2: Frame Processing