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MODBUS protocol, version RTU, supports data reading from a Valmet Damatic control system Valmet Damatic by means of gateway RTU GTW:LIS gateway.
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| komunikacna_linka |
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Communication line configuration
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- Communication line category: Serial.
- Parameters of the asynchronous line depending on the design and type of device connection – literature see the documentation "Overview of the Damatic XD System – VALMET Automation V.5.4 rev.7".
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| komunikacna_stanica |
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| komunikacna_stanica |
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Communication station configuration
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- Communication protocol: Valmet MODBUS RTU GTW:LIS.
- Station The station address is a decimal number in the range of 0 to 255.
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There can be defined the following parameters:
Table 1
Key word| Keyword | Full name | Meaning | Unit | Default value |
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| 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 | 300 millisec. |
| Wait First Timeout | First waiting |
on the | for a response after sending a |
call| request. | ms | 200 millisec. |
| Wait Timeout | Delay between the readings of a response until it is completed. | ms | 100 millisec. |
| Max Wait Retry |
Number retry reading | until it is completed. | - | 10 |
String with protocol parameters is written according to this rule:
Key_word=value;Key_word=value; ...
Example:
RC=1;RT=500;
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.
I/O tag configuration
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I/O tags: Ai, Di
Address – a decimal number in the range of 0 to 65535 – number of MODBUS register.
In general, 2 bytes are read (sign signed integer) from a particular register. For Ai points, IEE 754 standard can be used, which is means a reading of 4 bytes in format FLOAT, i.e. the registers on with addresses Address and Address+1.
For Di points, the bit number of bit must be from the specified, withing range of 0 to 15 – it represents one bit from a 16 bits from -bit MODBUS register which was read.
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- Ver. 1.0 – February 9, 2000
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