The steps for step7 to read the maximum value of an analog quantity are as follows:
1. Use STEP7 to monitor input and output quantities DP: high-speed data transmission 1. Open the PLC software. Run STEP7, open the PLC software, expand the folders on the left until Blocks is selected, as shown in the figure below: 2. Find the VAT block. Alright on the right. After completing the module selection and external wiring, PLC programming is performed to convert the data collected by the AI ??module into engineering values, that is, pressure, temperature, flow, etc. When using Siemens STEP7 software for programming, function block FC105 is generally used, which is the analog signal standard.
2. For the Siemens S7-300 series, we need to use the expansion module, open Siemens STEP7, select the appropriate PLC and analog modules, and add the modules. For PLC, each analog quantity has a fixed address, and this address can be determined by Xiaofamao. 1. To display the real flow value, you need to give a range. For example, the flow rate is 100 cubic meters/hour. The analog signal calculation output formula is as follows: Analog output value = 100 * Analog input value / 27648. To improve accuracy, it is best to convert to floating point. The plan is over.
3. Set the 4-20mA output type to "I" as shown in the figure below: Make a program to assign a value to the output address of the analog output module, and then measure the output current. The analog output module has no output if no value is assigned. Technical community: http://I will talk about it later. How to online monitor 300 to read the analog output value PQW and confirm the actual current or voltage output by the plc. Click on the online "eye" of step 7. The switch input and output have status, and the intermediate variable values ??can also be displayed, but you cannot see what the pqw module is.
4. Basic steps To transfer operator monitoring configuration data to the WinCC database, proceed as follows: Insert operator station object You must create an operation for each operator monitoring system in SIMATIC Manager Member station object. You can do the following: Open the STEP7 project. Make your choice. If the input integer value is less than K1, the output will be clamped at LO_LIM and an error will be returned. Back calibration is available by setting LO_LIM>HI_LIM. When using inverse transformation, the output value will decrease as the input value increases. 3) The parameters of FC105 define what the fault information is.