Just have to add a block file name in the D1BLK, D2BLK, D3BLK... PLC Excel spreadsheet fields. If you need to add a saved circuit file (with blocks, lines, wires, text, etc...) ACADE will need a "*" (star symbol) included in front of the DxBLK file name, in example "*3-wire-analog-circuit.dwg".
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