16
Read Basic Drive Status Information
(Read the status and the speed of the drive or the value of its feedback
signal.)
While detailed status information can be read by accessing the Data Read-out parameters in
the 500 group of parameters and some other locations, it is also possible to read general drive
status by reading coils 33 through 64.
·
Coils 33 through 48 contain the drive Status Word.
·
Coils 49 through 64 contain the drive output speed during open loop operation and the
drive feedback value during closed loop operation.
Modbus RTU Function: 01
HEX
(Read Coil Status)
Overview:
•
Read the value of coils 33
10
through 64
10
.
Message from Modbus RTU Master to Drive
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Slave Address
Function
Coil Addr.,
High
Coil Addr.
Low
No. of Coils,
High
No. of Coils,
Low
01 01 00 20 00 20
Byte 6
Byte 7
CRC Error Check
3C 18
Modbus RTU message string:
[01] [01] [00] [20] [00] [20] [3C] [18]
Starting Coil Address = Coil Number – 1 = 33 – 1 = 32
10
= 20
HEX
[01] [01] [00] [20] [00] [20] [3C] [18]
Number of Coils to Read = 32
10
= 20
HEX
Message returned from Drive to Modbus RTU Master
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Slave
Address
Function #
of
Bytes
Coil Data
33 - 40
Coil Data
41 - 48
Coil Data
49 - 56
Coil Data
57 - 64
01 01 04 07 0F FF 1F
Byte 7
Byte 8
CRC Error Check
CA 9E
Example 3
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{
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Summary of Contents for Mobrus RTU TR1 Series
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