Siemens SIMATIC S7-1500 Manual page 18

Parameters/address space
4.3 Address space
Address space for configuration as 2 x 8-channel DQ 16x230VAC/2A ST S QI
For the configuration as a 2 x 8-channel module, the channels of the module are divided into
two submodules. The submodules can be assigned to different IO controllers when the
module is used in a shared device.
The number of IO controllers depends on the interface module being used. Please observe
the information in the manual for the particular interface module.
Unlike the 1 x 16-channel module configuration, each of the two submodules has a freely
assignable start address. The addresses for the respective value status of a submodule can
also be assigned by the user.
Figure 4-2
Note
Substitute value behavior in shared device operation with 2 x 8-channel configuration
If the system is in shared device mode and one of the associated IO controllers goes into
STOP or fails due to, for example, a communication failure, all submodules of the output
module follow the configured substitute value behavior (e.g. switch off).
This means that even when only one IO controller fails, the other IO controllers associated
with the shared device no longer control the assigned submodule of the output module.
18
Address space for configuration as 2 x 8-channel DQ 16x230VAC/2A ST S QI with value
status
Digital output module DQ 16x230VAC/2A ST Relay (6ES7522-5HH00-0AB0)
Manual, 07/2017, A5E34934019-AC