For 2nd to 4th submodule (=MSO submodule), the value status 0 indicates that the value is
incorrect or one of the following errors has occurred:
● The basic submodule is not yet configured (not ready).
● The connection between the IO controller and the basic submodule has been interrupted.
● The IO controller of the basic submodule is in STOP or POWER OFF state.
The following figure shows the assignment of the address space for submodules 1 and 2 and
the value status.You can find information on the Shared Input/Output (MSI/MSO) function in the section
Module-Internal Shared Input/Output (MSI/MSO) of the PROFINET with STEP 7 V13The tables below explain the meaning of the status and error displays. Remedial measures
for diagnostic alarms can be found in section Diagnostic alarms (Page 28).
RUN and ERROR LED
Table 5- 1 Status and error displays RUN and ERROR
LED Meaning Solution
RUN ERROR
Off Off
Voltage missing or too low at backplane bus • Switch on the CPU and/or the system power
supply modules.
• Verify that the U connectors are inserted.
• Check to see if too many modules are inserted.
Flashes Off
The module starts and flashes until the valid
parameter assignment is set.
---
On Off
Module is configured
On Flashes
Indicates module errors (at least one error at
one channel, e.g., short-circuit to ground).
Evaluate the diagnostics data and eliminate the
error (e.g., check the cables).
Flashes Flashes
Hardware defective Replace the module.
LED MAINT
Table 5- 2 MAINT status display
LED MAINT Meaning Solution

Off
0 = No maintenance interrupt is pending. ---

On
1 = The maintenance interrupt "Limit value
warning" is pending.The data records of the module have an identical structure, regardless of whether you
configure the module with PROFIBUS DP or PROFINET IO.
Dependencies for configuration with GSD file
When a GSD file is used to configure a module, dependencies can arise when "assigning the
parameters".
There are no dependencies for this module. You can assign the individual parameters in any
combinationYou have the option to reconfigure the modules in RUN (e.g. the response of selected
channels to the CPU-STOP state can be changed in RUN without having an effect on the
other channels)
Parameter assignment in RUN
The WRREC instruction is used to transfer the parameters to the module using data sets 64
to 79. The parameters set in STEP 7 do not change in the CPU, which means the
parameters set in STEP 7 are still valid after a restart.
The parameters are only checked for plausibility by the module after the transferThe module ignores errors that occurred during the transfer of parameters with the WRREC
instruction and continues operation with the previous parameter assignment. However, a
corresponding error code is written to the STATUS output parameter.
The description of the WRREC instruction and the error codes is available in the STEP 7
online help64 to 79 and are assigned as follows: