BECKHOFF ET1100 - Manual (Page 16)

Overview
III-2 Slave Controller – ET1100 Hardware Description
1.1 Frame processing order
The frame processing order of the ET1100 depends on the number of ports and the chip mode (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→1 / 1→2 / 2→0 (log. ports 0,1, and 2)
or
0
→EtherCAT Processing Unit→3 / 3→1 / 1→0 (log. ports 0,1, and 3)
4 0 →EtherCAT Processing Unit→3 / 3→1 / 1→2 / 2→0
Figure 2 shows the frame processing in general:
1
Port 2
Auto-
Forwarder
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
Loopback function
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
EtherCAT
Slave Controller
port 2 closed
port 2 open
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