The batching system adopts the master-slave structure, with the industrial computer as the upper host and Siemens PLC, frequency converter and weighing instrument as the lower slave. The host is in the dominant position to realize the communication management and control of each slave computer. The RS-232 asynchronous communication interface of the industrial computer is connected to the PLC after the level conversion, forming a physical channel for the communication between the upper and lower computers. Another RS-232 port of the host is connected to the communication port of the weighing instrument to form a second physical channel.
020-34563445The Batching system adopts the master-slave structure, with the industrial computer as the upper host and Siemens PLC, frequency converter and weighing instrument as the lower slave. The host is in the dominant position to realize the communication management and control of each slave computer. The RS-232 asynchronous communication interface of the industrial computer is connected to the PLC after the level conversion, forming a physical channel for the communication between the upper and lower computers. Another RS-232 port of the host is connected to the communication port of the weighing instrument to form a second physical channel.
The host computer uses polling mode to communicate with the slave station one by one. The upper computer transmits the result of task planning to the PLC. In the process of PLC control, the upper computer uses the upper computer connection command to monitor the operating status and data area content of the lower computer, reads the internal status of the PLC and the real-time data of the weighing instrument in real time, and displays it on the upper computer. Automatic liquid dispensing system process control:
1) Start the system, set the required weight of the injection water for this time, and the PLC will automatically collect the weight signal of the liquid dispensing tank to determine whether the weight of the injection water in the tank reaches the set value. If the system returns the signal "yes", it will enter the next step and the system returns the signal "no"; Then the system automatically opens the water valve to add water to the liquid dispensing tank to the set weight.
2) The dispensing time of liquid medicine shall be set by the user.
3) The prescription auxiliary materials and main drugs are manually weighed by the user and added into the liquid dispensing tank.
4) Turn on the stirring motor, and the system will automatically countdown to the set stirring time after turning on the stirring motor.
5) The stirring rate of the mixing slurry and the temperature of the liquid at this time are displayed on the HMI user interface during the mixing process.
6) After the liquid dispensing is completed, the user can complete the discharge filtration in the HMI, or it can be set to automatic mode.
