Communication via RS485
5.4 Communication using Modbus RTU
Fieldbuses
Function Manual, 04/2018, FW V4.7 SP10, A5E34229197B AE
145
Process data monitoring time (setpoint timeout), p2040
"Setpoint timeout" (F1910) is issued by the Modbus if p2040 is set to a value > 0 ms and no
process data is requested within this time period.
The "Setpoint timeout" only applies for access to process data (40100, 40101, 40110,
40111). The "Setpoint timeout" is not generated for parameter data (40200 … 40522).
Note
Adjust the time (factory setting = 100 ms) depending on the number of slaves and the baud
rate set on the bus.
An application example for MODBUS RTU is provided on the Internet:
Communication via the MODBUS interface
(https://support.industry.siemens.com/cs/ww/en/view/35928944)
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