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nuixt 鍙戣〃浜� 2019-2-15 11:35
涓�涓�灏廎B鑰屽凡

FB_NovRamReadWriteEx

The FB_NovRamReadWriteEx function block accesses the NOV-RAM (e.g. of the FCxxxx-0002 fieldbus cards, CX9000 NOVRAM, etc.) from a PLC program. Activation of the function block is triggered by a rising edge at the bRead or bWrite input. A certain number of data bytes is read from or written to the NOV-RAM. If both inputs, i.e. bRead and bWrite are set at the same time, data are first written to the NOV-RAM and then read back. Unlike with the FB_NovRamReadWrite block, the address offset for write and read access can be specified in the NOV-RAM. The block also checks the permitted NOV-RAM memory access mode and copies data byte by byte into the NOV-RAM memory if required, instead of using MEMCPY. The CX9000 NOV-RAM, for example, only allows byte access, and the FB_NovRamReadWrite block would return an error in this case.

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