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Communication with PLC devices by the WAGO company

The modular distributed system by the WAGO company (http://www.wago.com) is offering a wide variety of the communication options: Modbus TCP/IP, Modbus RTU, Lonworks, PROFIBUS, PROFINET, DeviceNet, CanOpen ...
There are currently two basic component types available: the 750-3xx are the communication modules only and 750-8xx are programable stations (according to the IEC 61131-3 standard).

Communication by the Modbus protocol

- Modbus TCP/IP: supports: WAGO-I/O-SYSTEM 750, stations: 841/341/842/342.
- Modbus RTU: supports WAGO-I/O-SYSTEM 750, stations: 812/312/815/315 (for RS485) and 814/314/816/314 (for RS232).

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"
For this driver, it is recommended to set the configurators:
- PmaCommGroup > Parameters > Special Parameters > Area base addresses:
- Base address "Bo = Coil/output bits" = 512
- Base address "Bi = Input bits" = 0
- Base address "Ro = Holding/output registers" = 512
- Base address "Ri = Input registers" = 0
- PmaCommGroup > Parameters > Special Parameters > Maximum number of variables received in one message:
- Maximum number "Bo = Coil/output bits" = 512
- Maximum number "Bi = Input bits" = 512
- Maximum number "Ro = Holding/output registers" = 125
- Maximum number "Ri = Input registers" = 125

The WAGO devices of the 750-8xx series also have the so-called "Merkers" memory area, that begin at address 3000 hexa = 12288 dec. Due to the fact that this is the same area as the registers (in Ro area) with address 512, this memory can be read:
- either with recalculated address for registers
- or put the registers and the memory into two PmaCommGroup objects and set different base address for each of them.

Communication by the BACnet protocol

Communication by the BACnet protocol is supported by WAGO-I/O-SYSTEM 750, station: BACnet/IP-Controller 750-830.

For this communication in the PROMOTIC system can be used:

Free communication through RS232, RS485

The WAGO-I/O-SYSTEM 750 allows to add the serial module to any communication or programable module (it is possible to use multiple serial modules simultaneously in one station). This interface allows to develop the necessary protocol (or to use the preset libraries for Modbus RTU communication).

For this communication in the PROMOTIC system can be used:

Communication by other protokols

The communication on the PROFIBUS, DeviceNet ... is accessible for the PROMOTIC application by the OPC interface. The PROMOTIC application is the OPC client and it communicates with the OPC server. The OPC server for this communication has to be purchased at the HW supplier.

PROMOTIC 9.0.28 SCADA system documentation MICROSYS, spol. s r.o.

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