Absolute encoder outputs reflect multi-bit binary numbers of absolute positions. For manufacturing reasons, absolute encoders typically use Gray code. Only one bit of the two binary numbers adjacent to the Gray code changes. After reading the Gray code with the input module of plc, you need to convert it to a normal binary number and then convert it to the actual position value.
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For the S7-200, after downloading the attachment graycode.zip, extract the library file graycode.mwl. Execute the menu command "File" → "Add/Remove Library" of STEP 7 - Micro/WIN and you can see the installed library "GRAYCODE" in the "Library" folder of the instruction tree.
The "graycode.mwl" instruction library includes function blocks for encoding and decoding in byte, word and double word formats.
The function blocks BIN_GRAY_B, BIN_GRAY_W and BIN_GRAY_DW encode the binary numbers of the input byte, word and double word type into Gray code.
The function blocks GRAY_BIN_B, GRAY_BIN_W, and GRAY_BIN_DW decode the input Gray code into binary numbers of byte, word, and double word types.
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February 03, 2023