Siemens SINUMERIK 840D sl Function Manual

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Digital and analog NCK I/Os (A4)1.2 NCK I/O via PLCExtended FunctionsFunction Manual, 01/2008, 6FC5397-1BP10-3BA0 27840Di hardware digital I/OsDigital inputs/outputs are provided for the SINUMERIK 840Di via the MCI-Board-Extensionmodule. The following connections are available:● Two handwheels● Two probes● Four digital inputs/outputsNoteThe MCI-Board-Extension module is an option for the SINUMERIK 840Di. The pinassignment of the cable-distributor interface (X121) matches that of the cable distributoron the SINUMERIK 840D.SINUMERIK 840Di analog and digital inputs/outputsAnalog and digital inputs/outputs can be operated on the SINUMERIK 840Di by means ofSIMATIC S7 bus-interface and signal modules, via the PROFIBUS-DP.PLC I/Os for direct addressing by NCKUp to 16 bytes for digital input signals and analog input values plus a total of 16 bytes fordigital output signals and analog output values can be addressed directly by the partprogram. These bytes must be taken into account when the PLC is configured. They must beprogrammed consecutively. They are processed directly by the PLC operating system. As aresult, the time taken to transfer signals between the NC and PLC I/O modules is of an orderof magnitude of 0.5 ms.NoteThe output bytes specified for the NCK may not be write-accessed by the PLC user program,as the access operations between the NCK and PLC would be uncoordinated.Comparator inputsIn addition to the digital and analog NCK inputs, 16 internal comparator inputs (comparatorinput bytes 1 and 2) are also available.The signal state of a comparator input is formed by comparing an analog input signal with athreshold value within a setting data.