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Communication with PLC devices by the ABB company

It is possible to communicate with various PLC devices by the ABB company in various ways. List of possibilities of some of them follows:

The communication capabilities of ABB PLCs

AC800 PLC devices:
This PLC model line is designed for process automation. There are multiple options for communication with these PLC devices, but the most commonly used is the OPC server.
List of supported communication interfaces and protocols in the PLC device:
- RS232 (standard 2 ports on the processor) with the support of Modbus Master, ASCII
- Ethernet (standard 2 ports on the processor for Control Network Bus redundancy)
- Modbus TCP/IP (optional communication module)
- PROFIBUS DP V1 (optional communication module – in the Profibus Master mode)
- RS232 (optional communication module supporting the Modbus Master, Comli master/slave, Siemens 3964 master, ASCII protocols)
- MasterBus 300 (optional communication module for connection to ABB Advant Controller systems)
- INSUM (IEEE 802.3 protocol, optional communication module)


AC500 and AC31 PLC devices:
These model lines of PLC devices are designed for discrete automation.
- PLC devices AC500 and AC31 of the 90 series belong to the higher class of PLC devices and thus having wider communication capabilities.
List of supported communication interfaces and protocols in the PLC device:
- RS232 (normally 2 ports on processor, on 07SL97 there is 1 port)
- RS485 (on additional kommunication module 07KP93
- Ethernet (optional property of processors)
- PROFIBUS DP (optional property of processors)
- ARCNET (optional property of processors, normally on 07SL97)
- CANopen (optional property of processors)
- PCI (07SL97 by default)
- PLC devices AC31 of the 40/50 series belong to the basic class of PLC devices with the communication capabilities focusing mainly on Modbus RTU or DDE server.
- The Modbus RTU protocol is implemented on:
- the inbuilt communication serial port COM1 (RS232/RS485 interface)
- the additional communication module 07KP93 (COM3, COM4) with the RS232/RS485 serial interface.
- The DDE server is a part of the development environment AC1131. The PROMOTIC application can use the DDE communication to connect to the server and communicate with these PLC devices.

Selected communication options of the PROMOTIC application with ABB PLC devices

Communication by OPC server:
The PROMOTIC application gets the data from the OPC server by means of the PmaOpcDaClient object. See also: Communication by OPC interface
The OPC server is a part of the development environment for programming the ABB of PLC devices (AC31, AC500, AC800). This OPC server can be installed separately.
The OPC server supports also PLC routing. The OPC server can communicate:
- via serial link RS232.
- via Ethernet.
- in the Arcnet network
- through the PCI interface. In this case the Slot-PLC 07SL97 is used (PLC device as a computer card).


Communication by the ASCII protocol:
On the PLC device side (AC31, AC500, AC800) there is implemented the ASCII protocol on:
- the inbuilt communication serial port COM1 or COM2 (RS232 interface).
- the additional communication module 07KP93 (COM3, COM4) with the RS232/RS485 serial interface.

For this communication in the PROMOTIC system can be used:
- PmChar - Driver for communication by user defined ASCII/BIN protocol


Communication by the Modbus protocol:
The Modbus RTU and Modbus TCP/IP protocols are supported.
For this communication in the PROMOTIC system can be used:
- PmModbusMr - Driver for communication by the Modbus Master protocol.
For easy integration of this driver into the application it is handy to use:
- Preconfiguration "PmModbusMr - Communication set with data and panel for non-defined device"


Communication via Ethernet:
This communication is suitable for applications that require fast data transfer. Can be used:
- OPC server
- Modbus TCP/IP
- Direct communication by UDP sockets: By means of the PmaData object and the socket communication of the UDP without PROMOTIC head type type it is possible to communicate directly with PLC devices. Then this communication is very fast. But the designer must know the structure of UDP packets used in the PLC device (7-bytes head and then the binary data follows).


Communication over ARCNET industrial communication bus:
This communication is suitable for applications that require fast data transfer. The ARCNET communication port can be a part of the PLC device. The PLC device is supplied without or with the ARCNET (another order number tells this). The software is inbuilt.
It is possible to communicate over the ARCNET bus in the PROMOTIC system by means of the OPC server: The communication card F-ARC E3 type must be in the computer (for PCI or ISA bus) or Slot-PLC 07SL97.
PROMOTIC 9.0.31 SCADA system documentation MICROSYS, spol. s r.o.

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