Siemens SINUMERIK Series Function Manual

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A4: Digital and analog NCK I/Os for SINUMERIK 840D sl1.2 Access via PLCExtended Functions32 Function Manual, 03/2013, 6FC5397-1BP40-3BA1Read actual valueThe signal state of the digital NCK inputs is sent to the PLC:DB10, DBB60 or DBB186 ... (actual value for digital NCK inputs)The actual value reflects the actual state of the signal at the hardware input. The influence ofthe PLC is ignored for the "actual value".Disable inputDigital NCK inputs can be disabled individually from the PLC user program:DB10 DBB0 or DBB122 ... (block the digital NCK inputs)In this case, they are set to a defined "0" inside the control.Set input from PLCThe PLC can also set each digital input to a defined "1" signal:DB10 DBB1 or DBB123 ... (setting of the digital NCK inputs from the PLC)As soon as this interface signal is set to "1", the signal state at the hardware input or theinput disable is inactive.Behavior during POWER ON / resetAfter POWER ON and reset, the signal level at the respective input is passed on. Ifnecessary, the PLC user program can disable or set the individual inputs to a defined "1" asdescribed above.1.2.3.2 NCK digital outputsFunctionTime-critical switching operations can be triggered very quickly via the digital NCK outputs,bypassing the PLC cycle times for the relevant machining and program-controlled (e.g. withthe block change).The signal state of digital output can be set or read again directly in the part programusing system variable $A_OUT[].There are also several ways of changing this set signal state via the PLC.ApplicationsDigital NCK outputs are used, for example, for the following NC functions:● Position switching signals (see Section "N3: Software cams, position switching cycles -only 840D sl (Page 535)")● Output of comparator signals