CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC
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CPU 410 as PROFIBUS DP master
Startup of the DP master system
You use the following parameters to set startup monitoring of the DP master:
● Ready message from module
● Transfer of parameters to modules
This means that the DP slaves must be started up and their parameters assigned by the
CPU (as DP master) within the set time.
PROFIBUS address of the DP master
PROFIBUS addresses 0 to 126 are permissible.
Output and input data length
The maximum output or input data length you can use for each DP station is 244 bytes.
When an ET 200PA SMART is used, the maximum usable output or input data length is 242
bytes
For each ET 200PA SMART you are using in a DP line, the total number of user data of this
DP line is reduced by one output word and one input word.
Diagnostics of the CPU 410 as PROFIBUS DP master
Diagnostics using LED displays
The following table explains the meaning of the BUS1F LED.
Table 4- 1 Meaning of the "BUSF" LED of the CPU 410 as DP master
Off Configuration correct;
all configured slaves are addressable
-
Lit
• Bus fault (physical fault) • Check whether the bus cable has shorted.
• DP interface fault
• Different baud rates in multi-DP master
operation (only in stand-alone operation)
• Analyze the diagnostic data. Reconfigure or correct the
configuration.
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