During monitoring, an error occurs. How can I resolve this issue if the PLC is uploading or downloading, in a fatal error state, or missing hardware? If you are using a 32K memory card with a CPU running version Rel2.xx, make sure that the data retention settings area, mandatory values, database, and user program size are all within the range supported by the older CPU version Rel1.xx.
Answer:
1. The issue stems from a mismatch between the new CPU version and the old memory card. The newer CPU can only read from the old card, not write to it, which causes the error. A 64K or 256K memory card is fully compatible with the new CPU version.
2. Here are some key features of the memory cards:
- 32K Memory Card: This is designed for storing and transferring programs, data blocks, and mandatory values only. It does not support advanced functions like saving recipes, data logs, or project files.
- 64K/256K Memory Card: These are suitable for the new CPU (version 23) and can store programs, data blocks, mandatory values, recipes, data records, and other files such as project documents or images. Once written, the data remains intact even after power-off.
- Note: 64K/256K memory cards are only compatible with the new CPU (version 23). A 32K card can be used to transfer programs to the new CPU but cannot take advantage of the new features. Additionally, the new CPU cannot write any data to a 32K card.
- If the memory card is blank or contains a program from a different CPU model, the system will trigger an error upon power-on. A high-model CPU can read a card written by a low-model CPU, and vice versa.
3. Common Issue:
Why does the SF (System Fault) error occur when copying a program to the S7-200CN using a new 23-version memory card?
The 23-version memory card is fully compatible with the S7-200CNCPU and can be used on SIMATIC S7-200 CPUs with version 23 or higher, or on the S7-200CN. However, due to regional restrictions, the transfer of programs from a standard SIMATIC CPU to the CNCPU via a memory card is limited. That means the program cannot be transferred between different types of memory cards.
To transfer a program to the CNCPU using a memory card, the card must be programmed directly on the CNCPU.
To clear the SF error, use the menu command "PLC > Memory card erase," then execute "PLC > Power-on reset."
Galvanized cable tray comes in various sizes and shapes, including straight sections, elbows, tees, crosses, and reducers. It is designed to be easy to install and maintain, and can be used in a variety of environments, including indoor and outdoor settings. Galvanized cable tray is commonly used in power plants, chemical plants, oil refineries, and other industrial facilities where there is a need for a reliable and robust cable management system.
Galvanized Cable Tray,Galvanized Steel Cable Tray,Galvanized Cable Trays,Galvanized Cable Ladder Rayhot Technology Group Co.,Ltd , https://www.cnrayhot.com
One of the benefits of galvanized cable tray is its resistance to corrosion. The zinc coating on the steel provides a protective layer that prevents rust and corrosion from forming on the surface of the tray. This makes galvanized cable tray ideal for use in environments where there is exposure to moisture, chemicals, and other corrosive substances.
Another advantage of galvanized cable tray is its strength. The steel used in galvanized cable tray is strong and durable, which means it can support heavy loads without bending or breaking. This makes it a popular choice for applications where there is a need for a sturdy and reliable cable management system.
Galvanized cable tray is also easy to install and maintain. The tray can be cut to size and shaped to fit around obstacles, making it a flexible solution for cable management. It can also be easily cleaned and maintained, which helps to extend its lifespan and keep it in good condition.
