Setup With Different Voltage Classes - Siemens LOGO! Manual

High-speed/optimal communication performance
For optimal and high-speed communication performance between the LOGO! Base Module
and the various modules, we recommend that you install the digital modules first, then the
analog modules (examples above). (The special function PI controller is an exception: the AI
used for the value PV should be on the LOGO! Base Module or an analog input module
adjacent to the LOGO! Base Module).
Siemens recommends that you position the CM AS Interface on the far right. (If the AS
Interface voltage fails, communication between the LOGO! system and expansion modules
that are arranged to the right of the LOGO! CM AS Interface expansion module is
interrupted).
The LOGO! TD module is installed separately. You connect it to the LOGO! Base Module
with the included LOGO! TD cable.
Note
CM EIB/KNX must always be installed as the last module on the right of LOGO!.
No further interface modules may be connected to the CM EIB/KNX.
2.1.2

Setup with different voltage classes

Rules
Digital modules can only be directly connected to devices of the same voltage class.
You can connect analog and communication modules to devices of any voltage class.
You can replace two similar DM8 expansion modules by one appropriate DM16 expansion
module (and vice versa) without having to change the circuit program.
Note
Two DM8 12/24R can be replaced by one DM16 24R only if operated with a power supply of
24 V DC.
Two DM8 24R can be replaced by one DM16 24R only if operated with DC and P action.
LOGO!
Manual, 10/2017, A5E01248535-AA
LOGO! installation and wiring
2.1 Modular LOGO! setup
29