Communication by the
Modbus RTU protocol with
AMiT IO modules of the
DMM series. See
Communication with the IO modules by the AMiT company.
This preconfiguration can be activated when creating a new object (e.g. by
"New object ..." in the context menu of the object or by pressing the
Insert key after selecting the object) and is included in the group:
"/ Communication / Protocols and other communications / Modbus".
This preconfiguration can be created in the object:
PmaFolder or
PmaRoot.
The preconfiguration creates an object of the
PmaComm type and data for the corresponding number of analog and digital inputs and outputs. Also the panel with complex
Pmg objects is created for displaying their status. This allows to define the required number for the specific connected device.
The preconfiguration is created for serial link
Modbus RTU. The modules use the
RS485 bus for communication. It is important to ensure that additional communication parameters are correctly configured (device address, port number, transfer rate, parity, ...) The configuration procedure of the devices is described in the documentation provided by the manufacturer. The communication parameters in the PROMOTIC application are defined in
Setting the parameters of the serial link of the
PmaComm object and in
Parameters of the
PmaCommGroup object.
- The preconfiguration is created including the panel (object of the
PmaPanel type) is functional also as
Web panel.
- The panel serves for communication testing and it is not essential for the communication functionality.
In the
PmaComm object named "
Comm" the communication parameters are set (
Serial port,
Baud rate ...).
The
PmaCommGroup object named "
data" includes a "
Parameters" tab where
Special Parameters are defined (see
PmModbusMr - Driver for communication by the Modbus Master protocol). On the "
Data" tab, the items are imported by data extension of items defined in the
PmaData object (see
ExtComm). Each
Data corresponds to the selected device type by its structure and name.
Some types of the I/O modules (
DMM-DI24) allow to use any of the binary inputs as counters. In this mode it is possible to read the walues but also write (reset the counter). Detailed specifications and limitations is described in the documentation supplied by the manufacturer.
This preconfiguration is not designed for modules of the
DMM-FCx type. These devices allow only reading/writing to the specific addresses in the Modbus communication that has specific meaning.
These configurators can be set before the preconfiguration is created:
| The name of created object | Name of the object created in the Pma objects tree.
The maximum name length is 30 characters.
This is a system name, so it must contain only alphanumeric and must not contain any diacritics (i.e. national dependent characters), empty string, spaces and the first character must not be a number.
Default: "CommAMiT_DMM" |
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|
| Serial port | Selection 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 the application is launched 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 the application is launched. This port must be correctly configured and accessible in Windows OS (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. |
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| Baud rate | Selection 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 |
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| I/O module address | The device address in the Modbus network.
After the preconfiguration is created, the "PmaCommGroup > Parameters > Special Parameters > Default device address" configurator will be set to this value. |
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|
| Communication refresh rate [ms] | The 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. |
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| Number of analog inputs | Allows to enter the number according to the device type |
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| Number of digital inputs | Allows to enter the number according to the device type |
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| Number of digital inputs used as counters | Allows to enter the number according to the device type |
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| Number of digital outputs | Allows to enter the number according to the device type |
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