ET
AS
ES
43
0.1
-U
se
r’s
G
uid
e
29
Example 2
6 on page 29 shows an example in which three modules with different acquisition rates are linked to each other. The transfer scheme for
this configuration is shown in Fig. 4
Fig. 4
-
6
Time-Multiplex Data Transfer Between an ES400 Module Chain and a PC
Fig. 4
-
7
Transfer Scheme for Example 2 (Simplified, Not True to Scale)
In this example, the third module periodically generates 2
16
(65536) time slices (Ethernet frames) each 100 microseconds long. The ES400 mod
-
ules 1, 2 and 3 acquire measurements at a rate of 10 kHz, 2 kHz and 5 kHz. Module 1 links its measurements to each Ethernet frame, module 2 to
every fifth Ethernet frame and module 3 to every second Ethernet frame (bottom figure).
Independently of this, control variables can be transferred at the same time from the PC to the modules.
St ellgrößen
Messdat en
M1
Rat e: 10 kHz
Einkoppler
Auskoppler
Frame
Generat or
(inakt iv)
MODUL 1
Et hernet
100 Mbit /s
PC
St ellgrößen
Messdat en
M2
Rat e: 2 kHz
Einkoppler
Auskoppler
Frame
Generat or
(inakt iv)
MODUL 2
St ellgrößen
Messdat en
M3
Rat e: 5 kHz
Einkoppler
Auskoppler
Frame
Generat or
(10 kHz)
MODUL 3
Ethernet -Frame 1
M1
H
R
M 1
H
R
M3
M2
M1
H
R
t [µs]
200
0
100
Frame 2
Fr. 65536
Periodendauer Frame-Generat or
M3
M 1
H
R
Frame 3
M1
H
R
Frame 4
M3
M 2
M1
H
R
Et hernet -Frame 5
300
500
400
H
UDP/IP Header
R
Reserviert für zusät zliche
Kommunikat ion
Mn
Messdaten von M odul n