Other signal modules   
7.3 Dummy module DM 370; (6ES7370-0AA01-0AA0) 
  S7-300 Automation System Module data 
7-4  Manual,  08/2006, A5E00105505-04 
7.3  7.3 Dummy module DM 370; (6ES7370-0AA01-0AA0) 
Order number 
6ES7370-0AA01-0AA0 
Properties 
The dummy module DM 370 reserves a slot for a non-configured module. It can be used as 
dummy module for: 
●  Interface modules (without reservation of address space) 
●  Non-configured signal modules (with reservation of address space) 
●  Modules which occupy 2 slots (with reservation of address space) 
When replacing the dummy module with another S7-300 module, the mechanical assembly 
and address assignment/addressing of the entire configuration remain unchanged. 
Configuration in 
STEP 7
 
Configure the DM 370 dummy module in 
STEP 7
 only if you module for a programmed 
signal module. If the module reserves the slot for an interface module, you can discard 
module configuration in 
STEP 7
. 
Modules which occupy 2 slots 
Install two dummy modules for modules which occupy 2 slots. You only reserve the address 
space using the dummy module in slot "x", rather than the dummy module in slot "x + 1". For 
details of the procedure, see the table below.  
The rack can receive up to 8 modules (SM/FM/CP.) When using two dummy modules to 
reserve a slot for a module of 80 mm width, you may still install 7 further modules 
(SM/FM/CP) because the dummy module only uses the address space for one module.