A point’s pn number indicates the Modbus register number the point is accessed with. Similarly, a point’s sn number indicates the ASD register that the point refers to. Each ASD channel (A, B, and C) has its own independent list of points.
A point’s value contains the value of the register referred to by its sn number. Via a service called data mirroring, point values are constantly being updated via communication with the connected drives and maintained locally within the interface itself. This greatly reduces the Ethernet network’s
Besides data mirroring, another advantage afforded by the ability to map any ASD register to any Modbus register is the capability of data reorganization. Data reorganization allows the grouping of ASD registers into more logical or efficient patterns to suit a given application. Because the Ethernet network client never “sees” the true ASD register numbers, the point mapping assignments can be determined by any
A point’s name is simply a descriptive title assigned to the point to more easily identify the point’s function during device configuration and monitoring. This name is only accessible via the HTTP (web browser) interface.
Refer to section 13 for specific information related to configuring points.
12.3.2 Direct (Implicit) Mapping
The
Modbus TCP/IP holding register = ASD register + 1
This means that in order to access a Toshiba drive register, simply add 1 to its register number and access that Modbus TCP/IP holding register. The reason for this offset is due to the fact that Toshiba drive registers begin at number 0, while Modbus holding registers must begin at number 1. Because this access method bypasses the point database’s explicit mapping definitions, it is referred to as “direct” or “implicit” mapping. Also, because direct mapping cannot take advantage of the point database’s data mirroring service, Ethernet
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