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5.8.2 CPU parameters
The CPU does not evaluate each parameter, which may be set at the hardware configu-
ration. The following parameters are supported by the CPU at this time:
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Short description: The short description of the Siemens CPU 312-5BE03 is CPU
312C.
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Order No. / Firmware: Order number and firmware are identical to the details in the
"hardware catalog" window.
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Name: The Name field provides the short description of the CPU. If you change the
name the new name appears in the Siemens SIMATIC Manager.
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Interface: Here is the address of the MPI interface.
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Properties: By means of this button you can change the properties of the MPI inter-
face.
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Comment: In this field information about the module may be entered.
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Startup when expected/actual configuration differs: If the checkbox for
‘Startup when
expected/actual configuration differ’
is deselected and at least one module is not
located at its configured slot or if another type of module is inserted there instead,
then the CPU does not switch to RUN mode and remains in STOP mode. If the
checkbox for
‘Startup when expected/actual configuration differ’
is selected, then the
CPU starts even if there are modules not located in their configured slots of if another
type of module is inserted there instead, such as during an initial system start-up.
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Monitoring time for ready message by modules [100ms]: This operation specifies the
maximum time for the ready message of every configured module after PowerON. If
the modules do not send a ready message to the CPU by the time the monitoring
time has expired, the actual configuration becomes unequal to the preset configura-
tion.
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Transfer of parameters to modules [100ms]: The maximum time for the transfer of
parameters to parameterizable modules. If not every module has been assigned
parameters by the time this monitoring time has expired; the actual configuration
becomes unequal to the preset configuration.
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Update OB1 process image cyclically:
This parameter is not relevant.
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Scan cycle monitoring time:
Here the scan cycle monitoring time in milliseconds may be set. If the scan cycle time
exceeds the scan cycle monitoring time, the CPU enters the STOP mode.
Possible reasons for exceeding the time are:
–
Communication processes
–
a series of interrupt events
–
an error in the CPU program
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Minimum scan cycle time:
This parameter is not relevant.
n
Scan cycle load from Communication:
This parameter is not relevant.
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Size of the process image input/output area:
This parameter is not relevant.
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OB85 call up at I/O access error:
The preset reaction of the CPU may be changed to an I/O access error that occurs
during the update of the process image by the system. The VIPA CPU is preset such
that OB 85 is not called if an I/O access error occurs and no entry is made in the diag-
nostic buffer either.
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Clock memory:
Activate the check box if you want to use clock memory and enter the number of the
memory byte.
Supported parameters
General
Startup
Cycle/Clock memory
VIPA System 300S
+
Deployment CPU 312-5BE23
CPU parametrization > CPU parameters
HB140 | CPU-SC | 312-5BE23 | en | 18-45
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