Yokogawa ASS9981DE-01 DCS Base Plate

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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.
ASS9981DE-01 Description:	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.
	module is installed to a ER bus node unit with HART function, the EB401 firmware must be rev. 2 or later.
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