ABB SYN5202 Channel output module

 Functional Overview When the communication function complies, the dual-redundant configuration (*1) can be provided by setting the serial communication modules to dual-redundant. 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. Note that the one-shot write specification cannot be used when dual-redundant communication is set.

Data Input Flow 

Each of the two ALR111/ALR121 modules communicates with the subsystem and reads the subsystem input image data into the module. An FCS accesses the control communication module to read and use these data; however, it does not access the standby communication module. When the FCS detects a control communication module error or subsystem communication failure, the FCS switches its control to the standby module from which to read data.

Data Output Flow 

A control communication module outputs data to a subsystem. The control communication module writes data to the subsystem at the specified intervals when an FCS sets the data in it. Meanwhile, the standby 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 standby communication modules. When an error is detected, the FCS switches its control to the stand-by module through which the FCS continues to output data to the subsystem.

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