Example 3 Read Basic Drive Status Information - Trane Mobrus RTU TR1 Series Instruction Manual

Example 3
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.
•
Byte 0
Slave Address
Byte 6
Modbus RTU message string:
[01] [01] [00] [20] [00] [20] [3C] [18]
[01] [01] [00] [20] [00] [20] [3C] [18]
Byte 0
Slave
Address
01
Byte 7
16
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.
Byte 1
Function Coil Addr.,
01 01
Byte 7
CRC Error Check
3C 18
Starting Coil Address = Coil Number – 1 = 33 – 1 = 32
Number of Coils to Read = 32
Byte 1 Byte 2
Function # of
Bytes
01 04
Byte 8
CRC Error Check
CA 9E
Byte 2 Byte 3
Coil Addr.
High Low
00 20
= 20
10 HEX
Byte 3 Byte 4
Coil Data Coil Data
33 - 40 41 - 48
07 0F
Byte 4 Byte 5
No. of Coils, No. of Coils,
High Low
00 20
= 20
10 HEX
Byte 5 Byte 6
Coil Data Coil Data
49 - 56 57 - 64
FF 1F
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