Siemens SIMATIC TeleControl DNP3 - Page 101

Configuration
3.19 Telecontrol connections
Configuration - DNP3
Configuration Manual, 11/2018, C79000-G8976-C508-01
101
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Max. number of statistics queries
If the configured number of statistics requests of the master is exceeded within the key
exchange interval, the module enters a message in the diagnostics buffer of the CPU.
Range of values: 2...255 Default setting: 5
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Authentication requests before key exchange
Maximum number of authentication requests of the module to the master. When this
number is reached, the session key is renewed.
Range of values: 1...10000 Default setting: 1000
Recommendation: Set the number for the station module twice as high as for the master.
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Key exchange interval
Period after which the key is exchanged again between the station module and the
master. The interval must be matched up on both communications partners.
Range of values: 0...65535 min. at 0 (zero), the key is never changed (function disabled).
Default setting: 15 min.
Recommendation: Set the key exchange interval for the station module twice as high as
for the master.
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Authentication timeout
Maximum wait time of the module after an authentication request to the master. If the
waiting time for the response from the master is exceeded, the module generates a
security event and sends this to the master.
Range of values: 1... 65535 s Default setting: 5
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Pre-shared key
The pre-shared key can be configured in two ways:
– Manual configuration
Enter the pre-shared key in STEP 7 manually as a hexadecimal value.
– Import as file
Import the pre-shared key from the file system of the engineering station if the pre-
shared key was generated by the master or another system.
The pre-shared key of a station module must be identical to the pre-shared key of the
master.