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Modbus-RTU Example Connection A-9
MN448
Register 163: Display Scaling
The parameter value is stored as a combined 16 bit word which is constructed as follows:
High byte
Low byte
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Display Scaling Source
Display Scaling Factor : 3dp, e.g. 0 – 16000 = 0.000 – 16.000
0 :
Motor Speed
1 :
Motor Current
2 :
Analog Input 2 Signal
3 :
PI Feedback
A.10 Modbus Exception Response Telegrams
Under some circumstances, the drive may reply with an Exception Response (error) in response to a request telegram sent
from the network master, for example where the master tries to read a register which does not exist. Exception Responses
which can be generated by the drive are listed below:
Exception Code 1:
Invalid Request
Exception Code 2:
Invalid Modbus register
Exception Code 3:
Register Value Out of Range
Exception Code 6:
Drive Busy
Exception codes may be returned under the following conditions:
• Network Master sends an unsupported Modbus command (e.g. Read Coils).
• Run command issued to drive whilst the drive is not set for Modbus Control Mode (e.g. 1103 <>4).
• Run command issued to drives whilst the drive is not enabled (e.g. Digital Input 1 is open).
• Run command issued to drive whilst the drive is in a tripped condition.
• Network Master attempts to read or write a register that does not exist within the drive.
• Network Master attempts to write a holding register with a value outside the range of the register
• Drive busy due to internal data transfer. The Network Master should re-send the message after a delay
A.11 Dataflow Example
Read data from register 6
Request:
[01]
[03]
[00] [05]
[00] [01]
[94] [0B]
(Drive Addr)
(Command)
(Reg start addr)
(No. of Registers)
(Checksum)
Reply:
[01]
[03]
[02]
[00] [00]
[B8] [44]
(Drive Addr)
(Command)
(No of data bytes)
(Data)
(Checksum)
Note: The actual start address of register 6 is 5. All data in [ ] is in 8bits Hex format.
Write start command to the register 1 (suppose 1103 = 3, 9902 =0 and digital input 1 is closed):
Request:
[01]
[06]
[00] [00]
[00] [01]
[48] [0A]
(Drive Addr)
(Command)
(Reg addr)
(Data value)
(Checksum)
Reply:
[01]
[06]
[00] [00]
[00] [01]
[48] [0A]
(Drive Addr)
(Command)
(Reg addr)
(Data value)
(Checksum)
Note: The actual address of register 1 on the data link is 0. All data in [ ] is in 8bits Hex format.
Reply can be error message depending on drive parameter settings and digital input status.
Summary of Contents for EC Titanium ECS100A1H1DF4
Page 1: ... MN448_May 2020 May 2020 EC Titanium Manual User s guide ...
Page 10: ...1 4 Introduction MN448 ...
Page 20: ...3 4 Mechanical Information and Mounting MN448 ...
Page 26: ...4 6 Electrical Installation and Planning MN448 ...
Page 32: ...5 6 Control Pad Wiring and Keypad Interface MN448 ...
Page 36: ...6 4 Keypad Programming and Basic Operation MN448 ...
Page 44: ...8 4 Parameter Navigation and Groups MN448 ...
Page 51: ...9 7 Control Modes MN448 ...
Page 77: ...11 8 Standalone Motor and ABB Drive Setup MN448 ...
Page 99: ...A 12 Modbus RTU Example Connection MN448 ...
Page 102: ......