The following configurations are possibleIf the system is in shared device mode and one of the IO controllers involved goes into
STOP or fails due to a communication failure, for example, all submodules of the output
module perform the configured substitute value reaction (e.g. shutdown).
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.The value status is always activated for the following module names:
● DQ 32x24VDC/0.5A HF QI
● DQ 32x24VDC/0.5A HF S QI
● DQ 32x24VDC/0.5A HF MSO
An additional bit is assigned to each channel for the value status. The bit for the value status
indicates if the output value specified by the user program is actually pending at the module
terminal (0 = value is incorrect).
Note
The maintenance interrupt "Limit value warning" has no effect on the value status.he following figure shows the assignment of the address space for the configuration as a
32-channel module with value status. You can freely assign the start address for the module.
The addresses of the channels are derived from the start address.
The letters "a to d" are printed onto the module. "QB a" stands for module start address
output byte a.For the configuration as a 4 x 8-channel module, the channels of the module are divided into
multiple 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 used. Please observe the
information in the manual for the particular interface module.
Contrary to the 1 x 32-channel module configuration, each of the four submodules has a
freely assignable start address. The addresses for the respective value status of a
submodule can also be assigned by the userFor the configuration as a 1 x 32-channel module (module-internal Shared Output, MSO),
channels 0 to 31 of the module are copied to multiple submodules. Channels 0 to 31 are
then available with identical values in various submodules. These submodules can be
assigned to up to four IO controllers when the module is used in a shared device:
● The IO controller to which submodule 1 is assigned has write access to outputs 0 to 31.
● The IO controllers to which submodule 2, 3, or 4 is assigned have read access to outputs
0 to 31.
The number of IO controllers depends on the interface module used. Observe the
information in the manual for the particular interface module.
Value status (Quality Information, QI)
The meaning of the value status depends on the submodule on which it occurs.
For the first submodule (=basic submodule), the value status 0 indicates that the value is
incorrect or that the IO controller of the basic submodule is in STOP state.
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.The tables below explain the meaning of the status and error displays. Remedial measures
for diagnostic reports can be found in section Diagnostics alarms (Page 2The digital output module DQ 32x24VDC/0.5A HF supports diagnostic interrupts and
maintenance interrupts
For detailed information on the error event, refer to the diagnostic interrupt organization
block with the "RALRM" instruction (read additional interrupt information) and to the STEP 7
online help.