This preconfiguration can be used with the objects: PmFolder or PmRoot.
The created preconfigured connection is usually functional 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 protocol.
| The name of created object | Name of the object created in the application object tree. This is a system name and must not contain diacritics, empty string, spaces and the first character must not be a number. Default: "CommModbus" |
|---|---|
| Communication type | Serial communication |
| Network address | Network 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 while the application is launching). After this preconfiguration is created, the configurator is se to: PmComm > Settings of the Ethernet parameters > Network address |
| Close the connection after each transmission | This option sets the following configurators simultaneously: Not connect until first transfer. See: PmComm > Settings of the Ethernet parameters > Not connect until first transfer Close connection after every transfer. See: PmComm > Settings of the Ethernet parameters > Close connection after every transfer |
| Serial port | Selection of the communication serial port. Value can be change by OpenPort method. The value can be detected by method GetProtParam(""SerPort""). After this preconfiguration is created, the configurator is se to: PmComm > Settings of the serial link parameters > Serial port. Not set - The object is not connected to any port at the start of the application and the serial port can be selected dynamically by the algorithm (by the PmComm.OpenPort method). Modem - The object is meant for the data transfer over the dialed phone line (over the PmModem object). The serial port is assigned by the PmModem.SetPmComm method or by the PmComm object configurator of the PmModem object. COM1, COM2,..,COM66 - The specified serial port is opened at the start of the application. This port must be correctly configured and accessible in the OS Windows (no one can use it). For serial link each PmComm object must have defined another communication port. For example, when one PmComm object communicates through COM1, then next PmComm object can communicate for example through COM2 (COM3,..) but it mustn't communicate through COM1. |
| Baud rate | Selection of the baud rate (bps, bit per second). This configurator sets the initial value of the property BaudRate. After this preconfiguration is created, the configurator is se to: PmComm > Settings of the serial link parameters > Baud rate 110 300 600 1200 2400 4800 9600 14400 19200 38400 57600 115200 128000 256000 |
| Parity | Parity selection. Appropriate value for the device, which it is communicated with, must be selected. This configurator sets the initial value of the property Parity. After this preconfiguration is created, the configurator is se to: PmComm > Settings of the serial link parameters > Parity |
| Communication refresh rate [ms] | The time period in milliseconds to be used for reading the data by the PROMOTIC application. After this preconfiguration is created, the configurator is se to: PmCommData > Parameters > Communication refresh rate [ms] |
| Default PLC address | Valid device address within the Modbus network. After this preconfiguration is created, the configurator is se to: PmCommData > Parameters > Special Parameters > Default PLC address |
| Area base addresses | Here, 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 message | For 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. |
| Examples of testing data | |
| Number of digital outputs (Bo) | Possible to enter the number according to the device type |
| Number of digital inputs (Bi) | Possible to enter the number according to the device type |
| Number of analog outputs (Ro) | Possible to enter the number according to the device type |
| Number of analog inputs (Ri) | Possible to enter the number according to the device type |
| Create panel "Received data" | Creates a panel that monitors the statistics of communication values |
| Panel title | Displayed in the panel header |