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- Communication protocol: MODBUS RTU Quad2000.
- Address The address is MODBUS address that is set in Quad 2000.
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Configuration dialog box - tab "Protocol parameters".
They influence some optional parameters of the protocol. You can define the following parameters:
Table 1
| Key wordKeyword | Full name | Description | Unit | Default value | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Retry Count | Number of retry calls when The number of request retries when an error in communication occurs. | - | 2 | ||||||
| Retry Timeout | Delay between retry calls The delay between request retries if an error in communication occurs. | ms | 100 millisec.ms | ||||||
| Wait First Timeout | First waiting on the for a response after sending a callrequest. | ms | 100 millisec.100 ms | ||||||
| Wait Timeout | Delay between the readings of a response until it is completed. | ms | 100 millisec.100 ms | ||||||
| Max Wait Retry | Number The number of retry response reading readings until it is completed. | - | 20 |
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Example:
WT=100;MWR=20;
If a key word keyword with a valid value has not been found in the initial string, the default value is used according to Table 1.
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I/O tags: Ai, Ao, Ci, Co, Di, Do
For the relation between D2000 Value Type and Modbus Data Type Pre is applied this table, 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, you must define a type of conversion to physical units must be defined. Conversion type RTD, 0-10V, 4-20mA, 1-5V, or none is specified in the documentation (see Literature). You can get more detail detailed information about the settings of channels 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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- Ver. 1.0 - October 29, 2002 - Creation of document
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