Modbus Agile
02/2011
42
Protocol
7.4
Time Monitoring Function
The Modbus protocol defines a pure Master/Slave operation. If a frequency inverter is addressed by
the bus master, other frequency inverters will only be addressed after the protocol with the first fre-
quency inverter has been completed or the timeout time has expired.
After a frequency inverter has sent a message, a waiting time of 2 ms must be kept. This time is
needed by the frequency inverter in order to switch off the RS485 transmitter. The bus master may
not send a new message until this time has elapsed.
Attention!
If the degree of utilization of the CPU is high (> 90%), the response time can be more than 500 ms.
Note:
The specified times are valid for operation with RS485 and RS232.
Содержание Agile
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