Siemens S7-1200 TELECONTROL Operating Instructions Manual page 58

Configuration and operation
4.9 STEP 7 configuration
CP time
● CP time to CPU
Using this function, the CP can synchronize the CPU clock.
You will find details in the STEP 7 information system.
CP diagnostics
In the parameter group "CP diagnostics", you have the option of reading out advanced
diagnostics data from the CP using PLC tags.
● Diagnostics trigger tag
If you want to use advanced CP diagnostics, you need to configure the "Diagnostics
trigger tag".
If the user program of the CPU sets the PLC tag "Diagnostics trigger tag" (BOOL) to 1,
the CP updates the values of the configured PLC tags for advanced diagnostics. After
writing the current values to the PLC tags for advanced diagnostics, the CP sets the
"Diagnostics trigger tag" to 0 signaling the CPU that the updated values can be read from
the PLC tags.
Reading out the following diagnostics data can be enabled selectively:
Note
Fast setting of the diagnostics trigger variable
Triggers must not be set faster than a minimum interval of 500 milliseconds.
● Frame memory overflow
PLC tag (data type byte) for the send buffer overflow pre-warning. Bit 0 is set to 1 when
80% of the fill level of the send buffer is reached.
● Frame memory size
PLC tag (data type DWord) for the occupation of the send buffer. The number of saved
frames is displayed.
● Current IP address
PLC tag (data type String) for the current IP address of the CP.
● Mobile wireless signal quality (LED)
PLC tag (data type UInt) for the signal quality of the local mobile wireless network as this
is displayed by the "SIGNAL QUALITY" LED.
● Mobile wireless signal quality (dBm)
PLC tag (data type INT) for the signal quality of the local mobile wireless network as a
dBm value.
● 'NETWORK' LED
PLC tag (data type UInt) for the status of the connection for the data service in the mobile
wireless network.
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Operating Instructions, 10/2016, C79000-G8976-C311-02
CP 1242-7 GPRS V2