Siemens CPU417-4 H Produktinformation Seite 14

CPU 417-4H
2. Configuration
Setting the CPU Parameters that Determine Cyclic Behavior
You can specify the CPU parameters that determine the cyclic behavior of the system when
you configure the hardware with STEP 7. They are on the "Cycle/Clock Memory" tab. We re-
commend the following settings:
S
The longest possible scan cycle monitoring time (e.g. 6000 ms)
S
The smallest possible process input image (somewhat larger than the number of inputs
actually used)
S
The smallest possible process output image (somewhat larger than the number of outputs
actually used)
S
OB85 call in the event of I/O access errors: Only with incoming and outgoing errors
Setting the Number of Messages in the Diagnostic Buffer
You can use STEP 7 to specify the number of messages in the diagnostic buffer. This can be
done on the "Diagnostics/Clock" tab. Set a large number (e.g. 1500).
Setting the Parameter Assignment Monitoring Time
The parameter assignment monitoring time is a CPU parameter that you enter during hardware
configuration using STEP 7. The monitoring time depends on the size of the S7-400H configu-
ration. If the monitoring time is set too short, the CPU will enter the W#16#6547 event in the
diagnostic buffer. We recommend you set a parameter assignment monitoring time of 60 s.
Configuring Modules that Are Addressed in the I/O Address Area
Always configure a module that is addressed in the I/O address area so that it is either comple-
tely within or completely outside the process image.
Otherswise, consistency cannot be guaranteed and corrupted data may result.
Compatibility with the CPU 417-4H with Firmware Version V 1.1.x
The dynamic response of the CPU 417-4H as of firmware version V 2.0.0 at coupling and up-
dating has changed to that of the CPU 417-4H with firmware version V 1.1.x .
The new functions that have been integrated in the CPU 417-4H as of V 2.0.0, (e.g. connection
not terminated during coupling and updating, bumpless transfer of the inputs and outputs even
in the case of one-sided I/Os), mean that more data has to be copied than in systems in the
case of the CPU 417-4H with V 1.1.x. The procedure for the data transfer of the two CPUs for
coupling and updating has been improved, which means that the transmission times may
change.
If you want to download or transfer the configuration for a CPU 417-4H with V 1.1.x to a CPU
417-4H with a firmware version > V2.0.0, use STEP7 to set cycle time monitoring and the mo-
nitoring times for updating (see also S7-400H Programmable Controller; Fault-Tolerant Sy-
stems, Section 5.3).
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