Siemens SIMATIC ET 200AL - Page 1178

Functions
5.9 Standard machine projects
PROFINET with STEP 7 V15
Function Manual, 12/2017, A5E03444486-AH
231
2. Call the instruction "ReconfigIOSystem" and select MODE 1 to deactivate all IO devices.
If you set the CPU to STOP or POWER OFF state in order to modify the plant in this
status (for example to add an optional IO device), explicit deactivation using
"ReconfigIOSystem" with mode 1 is not necessary. In this case, i.e. following a STOP-
RUN transition and following a POWER-OFF > POWER-ON transition, all IO devices are
deactivated automatically.
3. When you have brought the plant to a safe status that allows restructuring without any
danger:
Put the plant together according to your intended application. Add the required optional
IO devices at the points at which you planned this in the configuration (observe the
order!) or remove optional IO devices that you no longer require.
4. Network the IO devices.
5. Startup the S7-1500 system and call again the instruction "ReconfigIOSystem". Select
MODE 2 to transfer the data record CTRLREC.
6. Following successful transfer of the data record, call again the instruction
"ReconfigIOSystem". Select MODE 3 to activate all IO devices forming part of the current
configuration.
Result:
The CPU
activates
the following IO devices:
– All IO devices that you have not set as optional IO devices.
– All optional IO devices listed in the control data record (CTRLREC).
The following IO devices remain
disabled
:
– Docking units (IO devices changing during operation).
– Optional IO devices that are not listed in the control data record.
Note
Call the instruction "ReconfigIOSystem" for all values of the parameter MODE with the same
control data record (CTRLREC)!
If you use different data records for the values of the MODE parameter, this results in an
inconsistent customization o
f the configuration and thus to rather incomprehensible error
messages.
Example: Data record structure for the activation of an IO device
The IO device "IO-Device_2" is to be activated as the only IO device in the user program.
To do this, you only require the hardware identifier of "IO-Device_2".
Recommendation: Use the system constants of the hardware identifiers instead of the
absolute values as shown in this example. With this procedure, the content of the DB is not
influenced by changes to the hardware identifiers as the result of changes to the
configuration.