7 Serial interface (Modbus RTU)
7.3 Operating mode Modbus RTU
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DC1 Frequency Inverter
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7.3.2 Structure of the slave response
7.3.2.1 Required transfer time
•
The time between receiving a request from the master and the response
of the frequency inverter is at least 3.5 characters (rest time).
•
Once the master has received a response from the frequency inverter, it
must wait for at least the rest time before it can send a new request.
7.3.2.2 Normal slave response
•
If the master request contains a write register function (function code
06), the frequency inverter immediately returns the request as a
response.
•
If the master request contains a read register function (function code
03), the frequency inverter returns the read data with the slave address
and the function code as a response.
7.3.2.3 No slave response
In the following cases, the frequency inverter ignores the request and does
not send a reply:
•
on receiving a broadcast request.
•
if the request contains a transmission error.
•
If the slave address in the request does not match the frequency
inverter's address.
•
With a CRC or parity error.
•
If the time interval between the messages is less
than 3.5. characters.
￫
The master must be programmed to repeat the request if it
does not receive a response within a specified time.
Summary of Contents for PowerXL DC1
Page 1: ...Manual PowerXL DC1 Frequency Inverter 10 12 MN04020003Z EN...
Page 4: ...II...
Page 12: ...0 About this manual 0 5 Units 8 DC1 Frequency Inverter 10 12 MN04020003Z EN www eaton com...
Page 190: ...9 Appendix 9 9 Sinusoidal filter 186 DC1 Frequency Inverter 10 12 MN04020003Z EN www eaton com...
