Hardware of PLC Control System of Lime Rotary Kiln

The environment of the production line field of the active lime rotary kiln is harsh. The system is easily affected by many factors, such as the high temperature, dust, vibration, electromagnetic interference and other factors. At the same time, the control system is complex and huge. In terms of the previous Relay control mode, a large number of the relays are connected through the hardwire. The wiring aging, sealing-off, contact arc, hard contact, stuckness and other phenomena are common. Once the faults happen, the error correction is very difficult. If there are some changes of the process, the hardware structure of the control system will have great changes. The system may be even redesigned. Therefore, in the renovation project, the PLC which is used for the system design has its unique advantages compared with the relay control.
First, the reliability is high and the anti-interference ability is strong. The PLC is professionally designed to adapt to the harsh industrial environments, which can work stably and reliably in the poor working environment. It can minimize the failure rate. In order to meet the above requirement, the PCL of the active lime rotary kiln takes the following favorable measures. PLC uses the microelectronic technology. A large number of switching operations is completed by the whole circuit, therefore, there will be no wiring aging, desoldering, poor contact problems.
Second, in terms of the hardware of the PLC, the shielding, filtering, isolation and other measures have been used in the design to prevent all kinds of interference.
Third, the PLC system software includes the fault detection and diagnosis procedures. When a fault occurs, the running state will be immediately saved and the memory will be closed to wait for troubleshooting.
Forth, the PLC has a WET watchdog monitor. If the procedure has infinite loop or runs more than the time provisioned by WET, PCL will give an alarm immediately and terminate the program execution. The performance of the active lime rotary kiln is perfect and the common use is very flexible. The PCL not only has the logical operations, conditional control, timing function and other control functions, but also can complete the AID conversion, DlA conversion, data processing and network communication. Therefore, it can control the switching value.
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