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 a communication with Landis&Gyr devices on the basis of ProfiBus communication protocol.
This communication supports (is verified) these Landis&Gyr devices:
Table 1
| Device | Version of software on device | Version of protocol |
|---|---|---|
| PRU10.64 |
Communication line configuration
The card KMFB02 (Incos a.s. Žilina) is used as physical communication interface with the firmware IpeSoft s.r.o. Žilina (stored in EPROM). The communication runs on baud rate 93.75 kBd. A firmware in card provides all basic tasks for access to ProfiBus network. The card needs a driver KMFB02.SYS.
- Communication line category: PROFIBUS
- Line parameters (PROFIBUS tab):
- Device ID – is ProfiBus Node Id, which is assigned to KMFB02 card. It must be an unused number in the range of 0 up to 32 and reserved for KMFB02 card in ProfiBus network.
Communication station configuration
- Communication protocol: L&G Profibus
- Station address is ProfiBus Node Id of 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 a behavior of the access to the communication medium. You can define the following parameters:
Table 2
| Key word | Full name | Meaning | Unit | Default value |
|---|---|---|---|---|
| WT | WR_TIME | Delay before the message is sent. | ms | 80 |
| RT | RD_TIME | Delay which is inserted into the executing of transaction when there is exceeded their maximum count. | 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 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.
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 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 software RefGen for easy configuration and servicing the
addresses of I/O tags when changing software in PLC. L&G utility „pointrep“
enables to generate a file „*.adr”, which is an input for RefGen. RefGen uses
the columns
“ProfiBus_Type” (Table 3), “OV_Index” (the address) and “Access_Right” (input/output).
Literature
-
Changes and modifications
-
Document revisions
- Ver. 1.1 – February 8, 2000 – Updating the document
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