What is a bit logic instruction? What are the PLC bit logic instructions? Application of PLC bit logic instruction

Bit logic instruction is the most basic and frequently used instruction in PLC programming. It has different forms according to different functions and uses. Generally speaking, it can be divided into the following categories: standard bit logic instruction, set / reset instruction, immediate bit logic instruction and other bit logic instructions. Bit logic instruction classification […]

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Four common touch screen maintenance skills

Four common touch screen maintenance skills Touch screen maintenance case 1: Fault phenomenon of Siemens touch screen TP270 maintenance: power on DC24V, the screen has no light, and the current is about 230ma. Processing process: touch the screen by hand, and the buzzer echoes, indicating that the program runs normally. The 12V DC voltage of […]

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Application of Siemens s7-200pc / PPI programming cable

At present, Siemens provides two kinds of serial programming cables, which are collectively called PC / PPI cable: RS-232 / PPI cable and USB / PPI cable. We strongly recommend to use the above two original cables produced by Siemens, which have the following advantages: Safety: the two communication ports of Siemens original PC / […]

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How to set the Siemens S7-200 PLC counter when the power is off?

1. When Siemens S7-200 PLC is applied, the following data holding methods can be selected: The built-in super capacitor of CPU can provide power buffer for data and clock when the power off time is not too long A super capacitor inside the CPU provides power buffer for RAM memory after power failure, and the […]

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Siemens S7-200 PLC how to set power down hold

Siemens S7-200 series PLC how to set the power down hold, the existing two data MW100, mw102 need to save how to set. A: let MW100 and mw102 be the data in mb0 ~ mb13. This value is fixed. Set it in the data storage of the system, and then download it to PLC. But […]

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