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Configuration, program blocks
4.6 Disabling SNMP via data record
If you use the program block "T_CONFIG" together with the "SDT CONF_DATA" for assigning
the parameters of NTP servers, you can use four additional NTP servers.
Configuration
For information on configuration, refer to the STEP 7 online help of the "Time-of-day
synchronization" parameter group.
• Accept time of day from non-synchronized NTP servers
The parameter has the following effect:
– If the option is enabled, the CM also accepts the time-of-day from non-synchronized
– If the option is disabled, the response is as follows: If the CM receives a time-of-day
4.6
Disabling SNMP via data record
Disabling SNMP via user program
As of firmware version V4.0 of the CM, you can disable enabled SNMP functions in the CM via
the user program.
To do this, use the block WRREC.
Disabling SNMP with WRREC
Create a data block with the following structure of the data record 0xB071 and transfer the
data record to the CM using WRREC. In WRREC, you use the CM interface as the hardware
identifier.
Static
snmp_record
•
•
•
•
•
•
* SNMPControl = TRUE: SNMP is enabled.
42
NTP servers with stratum 16.
frame from an unsynchronized NTP server with stratum 16, the time of day is not set
according to the frame. In this case, none of the NTP servers is displayed as "NTP
master" in the diagnostics; but rather only as being "reachable".
BlockID
BlockLength
Version
Subversion
Reserved
SNMPControl *
SNMPControl = FALSE: SNMP is disabled.
Struct
UInt
UInt
USInt
USInt
UInt
UDInt
Operating Instructions, 04/2023, C79000-G8976-C355-05
16#F003
8
1
0
0
0
SIMATIC CM 1542-1
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