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Preconfiguration "PmModbusMr - Minimal set of the PmaComm object"

Configuration of the PmModbusMr communication driver
 
This preconfiguration can be activated when creating a new object (e.g. by "New object ..." in the local object menu or after pressing the Insert key after selecting the object) and is included in the group: " / Communication / Modbus communication protocol".

This preconfiguration can be used with the objects: PmaFolder or PmaRoot.

 
The preconfiguration allows to choose two types of connection with the computer:
- via Ethernet
- via the computer's serial port (RS232/RS485..)

The created preconfigured connection is functional usually immediately. Otherwise it is necessary to obtain the connection parameters specified by the device manufacturer or in the documentation: PmModbusMr - Driver for communication by the Modbus Master protokol.

These configurators can be set before the preconfiguration is created:
The name of created objectName of the object created in the tree of Pma objects. The maximum name length is 30 characters. This is a system name, so it must contain only alphanumeric and must not contain any diacritics, empty string, spaces and the first character must not be a number.

Default: "CommModbus"

Communication type
Network TCP/IP communication (default)
Serial communication
Network addressNetwork address to which the communication will be connected. The address can be entered by both IP address (e.g. 192.168.0.15) or by name (e.g. server11).

Macro expression can be used for input (it is evaluated after starting the application).

After the preconfiguration is created, the "PmaComm > Setting the parameters of the Ethernet-client > Network address" configurator will be set to this value.

Close the connection after each transmissionThis option sets the following configurators simultaneously:

Not connect until first transfer. See: PmaComm > Setting the parameters of the Ethernet-client > Not connect until first transfer

Close connection after every transfer. See: PmaComm > Setting the parameters of the Ethernet-client > Close connection after every transfer

Serial portSelection of the communication serial port.

The value can be change by the OpenPort method. The value can be detected by method GetProtParam(""SerPort"").

After the preconfiguration is created, the "PmaComm > Setting the parameters of the serial link > Serial port" configurator will be set to this value.

Not set - The object is not connected to any port after starting the application and the serial port can be selected dynamically by the algorithm (by the PmaComm.OpenPort method).
COM1, COM2,..,COM66 - The specified serial port is opened after starting the application. This port must be correctly configured and accessible in the OS Windows (no one can use it).

For serial link each PmaComm object must have defined another communication port. For example, if one PmaComm object communicates through COM1, then next PmaComm object can communicate for example through COM2 (COM3, ...) but it mustn't communicate through COM1.

Baud rateSelection of the baud rate (bps, bit per second).

This configurator sets the initial value of the BaudRate property.

After the preconfiguration is created, the "PmaComm > Setting the parameters of the serial link > Baud rate" configurator will be set to this value.

110
300
600
1200
2400
4800
9600
14400
19200
38400
57600
115200
128000
256000
ParityParity selection. Appropriate value for the device, which it is communicated with, must be selected.

This configurator sets the initial value of the Parity property.

After the preconfiguration is created, the "PmaComm > Setting the parameters of the serial link > Parity" configurator will be set to this value.

NO
ODD
EVEN
Communication refresh rate [ms]The time period in milliseconds to be used for reading the current data by the PROMOTIC application.

After the preconfiguration is created, the "PmaCommGroup > Parameters > Communication refresh rate [ms]" configurator will be set to this value.

Default PLC addressValid device address within the Modbus network.

After the preconfiguration is created, the "PmaCommGroup > Parameters > Special Parameters > Default PLC address" configurator will be set to this value.

Area base addressesHere, the addresses of the beginnings of the data areas are entered (Bo, Bi, Ro, Ri).

The addresses for these areas are preset to 0. (if the preconfiguration for a specific device is not used - see Preconfigurations / Communication / Modbus communication protocol). For another PLC types the addresses my be different (e.g. the addresses do not begin with 0, but with 1 or 40001, etc.).

While communicating, the "Data item address" is modified as a sum of the relative item address (defined in the ItemID identificator) and the area base address.

Max.number of variables received in one messageFor each area (Bo,Bi,Ro,Ri) the maximum number of variables to be transmitted in one communication message is defined here. These values depend on the device type to communicate with (some devices support transmissions of low register numbers in a single message, other support higher numbers) - this specification can be found in the device documentation or must be tried/tested.

The preset values are 64 for Bo and Bi, 32 for Ro and Ri (if the preconfiguration for a specific device is not used - see Preconfigurations / Communication / Modbus communication protocol).

The preconfigured values are very low. Increasing these values (if the device allows it) may cause higher communication speeds because the transmitted data can be sent in a lower number of communication messages.


History:
Pm8.00.05: Created
PROMOTIC 9.0.13 SCADA system documentation - MICROSYS, spol. s r.o.

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