GDC801B101 3BHE051592R0101 controller

MODBUS SLAVE COMMUNICATION FUNCTION Modbus slave communication function enables ProSafe-RS a Modbus communication where an SCS acts as a Modbus slave and communicates with a Modbus master which is a different system from ProSafe-RS.  Relationship between SCS and Modbus Master Communication module’s definition information, Modbus device addresses, mapping definition of SCS data, and so on are to be downloaded using engineering function of a Safety Engineering Station (SENG). When a data is sent from an external Modbus master (external device), the SCS’s CPU receives it through its serial communication module. The SCS’s CPU sends a response message using the Modbus slave communication function to the Modbus master in response to the data request. The SCS Maintenance Support Tool displays error information and notifies the error status using the SCS status display function when an error in the serial communication module and communication content occurs.

Dual-redundant Communication 

The dual-redundant configuration of the network can be available by establishing an independent transmission path from the Modbus master for every two the serial communication modules mounted in the SCS. However, control/ stand-by switching function in between the dual-redundant serial communication modules mounted on adjacent slots is not supported.

SUBSYSTEM COMMUNICATION FUNCTION

 Modbus communication is adopted as the subsystem communication function for ProSafe-RS that allows an SCS to act as a Modbus master to communicate with the subsystem as a Modbus slave.  Relationship between SCS and a Subsystem The serial communication module communicates with subsystems at the specified intervals and stores the subsystem data in the communication modules’ I/O image. The subsystem communication function of SCS accesses the communication module asynchronously from them, and refers to or sets the I/O image. The application logic of SCS reads data from the communication I/O data area when the communication input FB is executed, and writes the calculation data to the communication I/O data area when the communication output FB is executed.

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