Siemens SIMATIC ET 200AL System Manual page 24

Application planning
3.2 Configuration variants with ET-Connection
Electrical maximum configuration
The number of usable I/O modules of a potential group is limited by the following points:
• Power requirements of the I/O modules
• Power requirements of the components supplied via these I/O modules
The maximum infeed current of the I/O modules is 4 A with 1L+ supply voltage (non-
switched) and 2L+ load voltage (switched). When the maximum infeed current has been
reached, you must open a new potential group.
Reference
You will find more information in the section Connecting cables for ET 200AL (Page 50).
3.2 Configuration variants with ET-Connection
3.2.1 ET 200AL with ET-Connection
Every ET 200AL interface module has 2 ET-Connection connections
From every ET-Connection, you have the option to set up a line with a maximum of 16
ET 200AL I/O modules.
ET-Connection1
The figure below shows a configuration in the IP65/IP67 environment with one
ET-Connection line.
Figure 3-1
22
ET 200AL with ET-Connection1
Distributed I/O system
System Manual, 08/2021, A5E31861578-AJ