GDD471A001 2UBA002322R0001 2UBA002322R0003 controller

Specification of Communication Function Connected device: Serial transmission interface Connection method: Connect a communication port of ALR111 or ALR121 with a serial transmission interface of subsystem Transmission protocol: Modbus protocol (RTU mode) No. of subsystem stations: Max. 30 stations/port

The control communication module writes data to the subsystem at the specified intervals when an SCS sets the data in it. Meanwhile, the stand-by communication module re-reads and retains the output image data when it accesses the subsystem at the specified interval. This equalizes the data between the control and stand-by communication modules. When an error is detected, the SCS switches its control to the stand-by module through which the SCS continues to output data to the subsystem.

Dual-redundant Communication 

The dual-redundant configuration can be provided by setting the serial communication modules on an adjacent slot. Each of the ALR111 and ALR121 modules has two ports; however, the dual-redundant communication requires two communication modules. The two sets of dual-redundant communication are enabled by two ports of ALR111/ALR121; however, the communication control is defined by each communication module. When one of the communication ports detects an error, both ports switch over the control/stand-by sides to the redundant module. Each of the two ALR111/ALR121 modules communicates with the subsystem and reads the subsystem input image data into the module. An SCS accesses the control communication module to read and use these data; however, it does not access the stand-by communication module. When the SCS detects a control communication module error or subsystem communication failure, the SCS switches its control to the stand-by module from which to read data. A control communication module outputs data to a subsystem.

 ORDERING INFORMATION 

Specify the model and suffix codes. For selecting the right products for explosion protection, please refer to TI 32S01J30-01E without fail.  TRADEMARKS • CENTUM and ProSafe are registered trademarks of Yokogawa Electric Corporation. • Modbus is registered trade mark of Schneider Electric. • Other product and company names appearing in this document are trademarks or registered trademarks of their respective holders.

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