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LOGO! installation and wiring 
 
2.1 Modular LOGO! setup 
 
LOGO! 
36
 
Manual, 04/2011, A5E03556174-01 
2.1.3 
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. 
 
Overview: Connecting an expansion module to the LOGO! Base Module 
In the following tables, "X" means that the connection is possible; "-" means that the 
connection is not possible. 
 
LOGO! Base Module 
Expansion modules 
 
DM8 
12/24R, 
DM16  
24R 
DM8 24, 
DM16 
24 
DM 8 
24R 
DM8 
230R, 
DM16 
230R 
AM2, 
AM2 PT100, 
AM2 RTD, 
AM2 AQ 
CM 
LOGO! 12/24RCE 
LOGO! 230RCE 
LOGO! 12/24RC 
LOGO! 24 
LOGO! 24C 
LOGO! 24RC 
LOGO! 230RC 
LOGO! 12/24RCo 
LOGO! 24o 
LOGO! 24Co 
LOGO! 24RCo 
LOGO! 230RCo