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Supported device types and ve=
rsions
Communicatio=
n line configuration
Communication station configuration
I/O tag configuration
Literature
Ch=
anges and modifications
Docum=
ent revisions
MODBUS RTU supports the communication with the control systems Quad 2000= of Cooper turbo-compressors.
Conf=
iguration dialog box - tab "Protocol parameters".
They influence some optional parameters of the protocol. You can define th=
e following parameters:
Table 1
Keyword | Full name | Description | Unit | Default value |
---|---|---|---|---|
RC
|
Retry Count | The number of request retries when an error in c= ommunication occurs. | - | 2 |
RT
|
Retry Timeout | The delay between request retries if an error in= communication occurs. | ms | 100 ms |
WFT
|
Wait First Timeout | First waiting for a response after sending a req= uest. | ms | 100 ms |
WT
|
Wait Timeout | Delay between the readings of a response until i= t is completed. | ms | 100 ms |
MWR
|
Max Wait Retry | The number of response readings until it is comp= leted. | - | 20 |
String with protocol parameters is written according to this rule:
Key_word=3Dvalue;Key_word=3Dvalue; ...
Example:
WT=3D100;MWR=3D20;
If a keyword with a valid value has not been found in the initial string= , the default value is used according to Table 1.
I/O tags: Ai, Ao, Ci, Co, Di, Do
For the relation between D2000 Value Type and Modbus Data Type, the= following table applies:
Modbus Data Type | D2000 Value Type |
---|---|
Coil Status - 0x references | Do |
Input Status - 1x references | Di |
Input Registers - 3x references | Ai, Ci |
Holding Registers - 4x references | Ao, Co |
The address is Modbus register number in the range of 0 to 65535.
For Ai and Ci points, a type of conversion to physical units must be def= ined. Conversion type RTD, 0-10V, 4-20mA, 1-5V, or none is specified in the= documentation (see Lit= erature). You can get more detailed information about the settings of c= hannels directly by browsing the channel configuration on the Quad display.= You can also get the limit values "Zero" and "Range" for the conversion of= voltage or current inputs.
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Related pages: