L&G ProfiBus communication protocol
Supported device types and versions
Communication line configuration
Communication station configuration
I/O tag configuration
Literature
Changes and modifications
Document revisions
Supported device types and versions
The protocol LGPROFIBUS implements communication with Landis&Gyr devices on the basis of the ProfiBus communication protocol.
This communication supports (is verified) these Landis&Gyr devices:
Table 1
| Device | The version of software on the device | Version of protocol |
|---|---|---|
| PRU10.64 |
Communication line configuration
The card KMFB02 (Incos a.s. Žilina) is used as a physical communication interface with the firmware by Ipesoft s.r.o. Žilina (stored in EPROM). The communication uses a baud rate of 93.75 kBd. Firmware in the card provides all basic tasks for access to the ProfiBus network. The card needs a KMFB02.SYS driver.
- Communication line category: PROFIBUS
- Line parameters (PROFIBUS tab):
- Device ID – is ProfiBus Node Id, which is assigned to the KMFB02 card. It must be an unused number in the range of 0 up to 32 and reserved for the KMFB02 card in the ProfiBus network.
Communication station configuration
- Communication protocol: L&G Profibus
- The station address is ProfiBus Node Id of the device (PRU10) in the range of 0 up to 32.
Station protocol parameters
The parameters are configured in a dialog box – Communication station - configuration dialog box.
They influenced the behavior of the access to the communication medium. You can define the following parameters:
Table 2
| Keyword | Full name | Meaning | Unit | Default value |
|---|---|---|---|---|
| WT | WR_TIME | Delay before the message is sent. | ms | 80 |
| RT | RD_TIME | Delay inserted into the executing of the transaction when the maximum count of transactions is exceeded. | ms | 100 |
| MTR | MAX_TRANSACTION_NUMBER | Maximum transactions that are unfinished. | - | 5 |
| MWR | MAX_WR_RETRY | Maximum retries during one record. | - | 5 |
| MTT | MAX_TRANSACTION_TIME | Maximum waiting time for the response to end the transaction. | sec | 6 |
| MMT | MAX_MESSAGE_TIME | Maximum time to complete at least one of unfinished transactions. After this timeout elapses, a communication error occurs in the station. | sec | 10 |
The communication runs in the transaction way (Request/Response) for both data reading and writing. Data are read one point after another, always as a separate transaction.
A string containing the protocol parameters is being defined as follows:
Key_word=value;Key_word=value; ...
Example:
WT=90;RT=200;MTR=7;
If there is used a keyword with an invalid value in the initialization string, there will be used corresponding default value according to the table 1.
I/O tag configuration
I/O tags: Ai, Ao, Ci, Co, Di, Do, TiR, ToR, TxtI, TxtO
I/O tag types correspond to the following „Profibus_Type“:
Table 3
| D2000 type | Profibus_Type |
|---|---|
| Ci, Co | Unsigned16 |
| Ai, Ao | FloatingPoint |
| TxtI, TxtO | Bit_String |
| TiR, ToR | TimeDiff32, TimeDiff48 |
| Di, Do | Unsigned16 |
The address is a number in the range of 0 up to 65535.
Note:
You can use the RefGen software for easy configuration and servicing of the addresses of I/O tags when changing software in PLC. L&G utility „pointrep“ enables generating a „*.adr” file, which is an input for RefGen. RefGen uses the columns “ProfiBus_Type” (Table 3), “OV_Index” (the address) and “Access_Right” (input/output).
Literature
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Changes and modifications
-
Document revisions
- Ver. 1.1 – February 8, 2000 – Updating the document
Related pages:
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