Principally, all parameters are then transferred as copies" "However, this does not apply if one of the blocks has the property Optimized access and the other block the property Standard access. Structured InOut parameters are not always passed by reference as one could assume. The documentation is not very clear on this issue, one must read everything thoroughly. It was caused by mixing optimized and standard FB access. The problem was solved by Siemens support. Split from Uncontrolled set/reset of 'INOUT' bits from FB. It seems to be a firmware issue in all TIA PLCs or I don’t understand what passing parameters by reference means… Setting and resetting another bit using all above mentioned functions in the same DB works well if the bit is not passed to any FB. It looks to me that it is passed as copy instead and if the OP writes the tag asynchronously just when the FB is processed, the write (bit set/reset) fails and the data in the DB is overwritten when the FB call ends. The data structure (PLC data type) is passed as an InOut parameter to a FB and therefor it should be passed as a pointer by reference.
As Siemens does not recommend to use this function I switched to an extra single command bit (which is more labor-consuming) and I use two events with SetBit and ResetBit functions.
The bit gets not always set or reset using the function SetBitWhileKeyPressed which is very annoying and possibly dangerous. Now with TIA I do the same with S7 1500 and S7 1200 CPUs and with various basic panels. The UDT was passed to a FB as INOUT parameter. In the former STEP 7 5.5 I used a byte member of a UDT placed in a DB to display the state of a device, one of the bits of that byte was used to control the device using the WinCC function SetBitWhileKeyPressed. With alarm logging system (incl.I have a similar experience with TIA v13. Operation (vertical installation, portrait format) Maximum permissible angle of inclination without external ventilation to EN 55 011 (limit class A)Įmission of radio interference acc. to EN 55 011Įmission of radio interferences acc. Interrupts/diagnostics/status informationĮmission of radio interference acc. Siemens s 1200 SIMATIC HMI KTP400 BASIC COLOR PN, BASIC PANEL, KEY AND TOUCH OPERATION, 4″ WIDESCREEN-TFT-DISPLAY, 256 COLORS, PROFINET INTERFACE, CONFIGURATION FROM WINCC BASIC V11 SP2/ STEP 7 BASIC V11 SP2, CONTAINS OPEN SOURCE SW WHICH IS PROVIDED FREE OF CHARGE FOR DETAILS SEE CD Display
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