Why does wincc sp1 read PLC data but cannot write data to PLC?

1. First of all, the PLC address you need to write to needs to be writable, for example, the input point on the PLC is read-only for WinCC, so it cannot be written.

2. If the field is used in wincc to write, the input field or the input and output field can be used, the output field is not, and the output field is used to display.

WinCC and PLC programs can be copied to other computers by direct copying and opening directly.

As for stopping WinCC, I recommend creating a button, then a "dynamic wizard", and then using the system function "exitwinccruntime" to exit the running system.

Here's how: First, change the name of the original project folder, and then copy the modified project to the original directory.

Second, open the copied project, enable the local server, and then change the project computer to the local computer name, and exit wincc.

Third, copy the following files from the original project folder to the new project folder: 1. ArchiveManager entire folder; 2. Running database with RT (..)MDF and.

ldf）。Okay, now open the project again, activate the run, and the original archive data has been linked. Quote from Siemens Technology Forum The Man Outside the City.

One of the industrial computers communicates with a flow meter through the serial port at the same time, and its flow value is directly displayed on the wincc. Now the other two industrial computers WinCC also want to be able to see this traffic signal. I want to write the traffic signal of that wincc into the PLC, so that other industrial computers can read the traffic signal.

I don't know how. Or is there an easier way to do it? A:

Since your WinCC is already able to communicate with the flowmeter and read the data, you can use OPC to establish a connection between the WinCCs if you want to read the data on the other two WinCCs. The specific idea is to use the WinCC that has been connected to the flowmeter as the OPC server, configure the DCOM settings, and the other two WinCCs as the OPC clients, add the OPC channel in the project, browse, and add variables, and then you can achieve the purpose of displaying the variable values on the server on the client.

Personal recommendation is PLC to PLC direct communication.

wincc can be used with c script getbit getword getdword... Transmission.

This problem also bothered me for a day, and then various searches were judged to be a problem with the PG PC interface setting, and the settings were solved as follows.

Use a C script or a VBS script to define a global function that is automatically updated on a regular basis, and the period can be 50 milliseconds or 5 milliseconds.

Hopefully you'll use scripts. If not, use the example project that comes with wincc, and refer to the C script in it.

Read-write I/O domainsRead and write I/O domainsRead and write I/O domains.

Set a variable in OPC to: "Read and Write", so that if the value of the variable is changed in WinCC, the changed value will be transmitted to the PLC with OPC.

It may be that the data format in your PLC program is different from the data format of the control in which your WinCC displays the data.