T8461 Microcomputer Signal Control Unit

Considering that the inverter of the squeegee unit of the flat screen printing machine developed by us is specialised, T8461 does not use the common application layer protocol, but tailors our special application layer protocol. The physical layer protocol is responsible for the transmission of physical signals, decoding, bit timing, bit synchronisation, etc.; the data link layer protocol is responsible for bus arbitration, message framing, data confirmation, error detection, flow control, etc.; the application layer protocol is mainly responsible for the allocation of identifiers, followed by network start-up or monitoring node handling, etc.

T8461 is a human-computer interactive control system, purely with sequential control or logic control can not meet the control requirements, therefore, the lift control system is controlled by stochastic logic. At present, the control of the lift is generally used in two ways, one is to use the microcomputer as the signal control unit, complete the collection of lift signals, operating status and function setting, to achieve automatic scheduling of the lift and set selection of the operating function, the drag control is completed by the frequency converter; the second control method to replace the microcomputer with a programmable controller (PLC) to achieve the signal set selection of the control.

T8461 Since the CAN protocol does not specify the allocation of message identifiers, different methods can be used depending on the application. Therefore, when designing a CAN-based communication system, it is very important to determine the allocation of CAN identifiers, which is the main content of the application layer protocol. In terms of control and performance, there is not much difference between these two methods. Most of the domestic manufacturers choose the second method, the reason is that the production scale is small, and the cost of designing and manufacturing the microcomputer control device by themselves is high; while PLC has high reliability, convenient and flexible programming, strong anti-interference ability, stable and reliable operation and other characteristics, so nowadays the lift control system is widely implemented by programmable controllers.