2-14
ET 200L, ET 200L-SC and ET 200L-SC IM-SC Distributed I/O Device
EWA 4NEB 780 6009-02c
The number of plug-in analog SC electronic modules is limited in the follow-
ing cases:
–
When there is no S7 DP master
–
When they are used in an ET 200L-SC IM-SC with a TB 16SC con-
nected
The PROFIBUS-DP standard EN 50 170, Volume 2, restricts the length of the
parameterization data to a maximum of 244 bytes. This means that when ana-
log SC electronic modules are used, the number of plug-in SC electronic
modules may be limited. You will find a formula below for calculating the
maximum number of SC electronic modules permitted in an
ET 200L-SC IM-SC:
244
x
10 + [(14 + D
7)]
1
+ [(21 + A
9 + K
5 + C
18)]
2
Key:
D = total number of digital SC electronic modules plugged in
A = total number of analog SC electronic modules plugged in
K = total number of analog channels plugged in
C = total number of SC counter modules plugged in
[...]
1
only necessary if digital SC electronic modules are plugged in
[...]
2
only necessary if analog SC electronic modules are plugged in
ET 200L-SC IM-SC: 15
2AE; 1
2DE: ––> D = 1; A = 15; K = 30
10 + (14 + 1
7) + (21 + 15
9 + 30
5) = 10 + 21 + 306 = 337
The result is greater than 244 so this configuration is not possible.
ET 200L-SC IM-SC: 8
2AE; 4
2DE: ––> D = 4; A = 8; K = 16
10 + (14 + 4
7) + (21 + 8
9 + 16
5) = 10 + 42 + 173 = 225
The result is less than 244 so this configuration is not possible.
ET 200L-SC IM-SC: 6
2AE; 3
1COUNT40kHz; 4
2DE:
––> D = 4; A = 6; K = 12; C = 3
10 + (14 + 4
7) + (21 + 6
9 + 12
5 + 3
18) = 10 + 42 + 189 = 241
The result is less than 244 so this configuration is not possible.
Number of Plug-in
Analog SC
Electronic
Modules
Example 1
Example 2
Example 3
Installation