Changing The Cpu Parameters - Siemens SIMATIC S7-400H Manual

Modifications to the System while in Operation
10.6

Changing the CPU Parameters

Only certain parameters (object properties) of the CPUs can be modified while in
operation. They are identified in the screen form by blue text (if you have set blue
as the color for dialog box text on the Windows Control Panel, the modifiable
parameters are shown in black).
Note
If you modify parameters that should not be changed, there is no automatic
transfer to the CPU whose parameters have been modified. In this case the event
W#16#5966 is entered in the diagnostic buffer.
Table 10-1 Modifiable CPU Parameters
Tab
Startup
Scan cycle/clock
memory
Memory
Time-of-day interrupts
(for every time-of-day (f ti
interrupt OB) interru t OB)
Watchdog interrupt (for
every watchdog every watchdog
interrupt OB)
Diagnostics/clock
Security
H parameters
The new values are to be chosen to suit both the user program currently loaded
and the new user program planned.
10-42
Monitoring time for signaling readiness by modules
Monitoring time for transferring parameters to modules
Scan cycle monitoring time
Cycle load due to communications
Size of the process image of inputs
Size of the process image of outputs
Local data (for the different priority classes)
Communication resources: maximum number of communication
jobs (you are only allowed to increase this parameter compared
to its previously configured value.)
"Active" check box
f d
"Execution" list box
Starting date
Time
Execution
Phase offset
Correction factor
Protection level and password
Test scan cycle time
Maximum scan-cycle time extension
Maximum communication delay
Maximum hold time for priority classes > 15
Minimum I/O hold time
S7-400H Programmable Controller Fault-Tolerant Systems
Modifiable Parameter
A5E00068197-04