Regarding the STEP7 software for Siemens S7-300, there are several questions about forced values
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As shown in the figure, 1. Forced values can be forced individually, but once the option to remove the forcing is clicked, all points have their forcing removed. Can the coercion be lifted separately? 2. Why must the forced value be in hexadecimal? Moreover, it is forced to 15B0; the real-time value I see is 0 (range: -30 to 30), but isn’t 15B0 equal to 5552 in decimal form? Even with the conversion from 819 to 4095, it can’t be 0, right?
1. In the STEP7 software, to release the force application on a specific point individually, one can go to the “Monitor – Force Values” menu, select the point for which the force application is to be removed, right-click on that point, and then choose “Cancel Force Application” from the menu that appears. 2. In the STEP7 software, forced values can be entered in various formats such as decimal and hexadecimal. If the value is to be in hexadecimal format, “0x” or “0X” must be added in front of the number, for example “0x15B0”. Regarding the question you raised, 15B0 converted to decimal is 5552, not 0. The reason why you see a real-time value of 0 could be due to other factors. It is recommended to check whether the program logic and hardware connections are functioning properly. -
1. In STEP7, there is no “Monitor – Forced Value” menu; only the “PLC – Display Forced Values” and “PLC – Monitor/Modify Variables” menus are available. And once the PLC-display forced value option is enabled, it shows the diagram I attached in the question. In the window showing the forced values, if you select a specific row and right-click to remove the forced setting, it will Release the forced status for all points; clicking on “Variable – Stop Forcing” also removes the forced status from all points. 2. The 8th row in the image attached to the question is the forced value that I added; the original value for that AI channel was 7. By entering W#16#15B0 in the forced value field, the channel value changed to 0. So why is 15B0 0?
1. What is a forced value? Answer: A forced value refers to a specific value that is manually set during the operation of the PLC program, thereby overriding the normal program logic; it is used for debugging and testing. 2. How to perform forced numerical operations? Answer: In the variable table of the STEP7 software, select the variable that needs to be forced. In the right-click menu for that variable, choose the “Force” option, enter the value to be applied, and confirm it. 3. Will forced values affect the operation of the PLC? Answer: During the forced numerical value period, the original program’s execution logic is overridden, which thus affects the normal operation of the PLC. Therefore, caution must be exercised when using forced values to avoid impacting online production. 4. How to remove mandatory values? Answer: In the variable table of the STEP7 software, select the variable that has been forced, and then choose the “Unforce” option from the right-click menu to remove the forced value. .
? ? ? ? ? If you can only copy and paste the instructions like a robot, then don’t reply to this question – it makes no sense at all.
If you want to answer, can’t you post a picture and indicate the steps? We still can’t understand it after half a day of trying to answer it