Working instruction method, and production control system

A working instruction method, applied to a production control system, wherein the production control system comprises a host computer, a manufacturing execution system (MES), a first programmable logic controller (PLC), second PLCs, workstations and display devices, the host computer is connected to the first PLC and the display devices respectively, the first PLC is connected to the MES and one or more of the second PLCs, a second PLC is connected to one or more of the workstations, and a display device is connected to one or more of the workstations,

• wherein the working instruction method comprises:
• obtaining, by the first PLC, a first working instruction request from the second PLC, wherein the first working instruction request comprises a working instruction identification requested by a target workstation;
• sending, by the first PLC, a second working instruction request to the MES based on the first working instruction request, wherein the second working instruction request comprises the working instruction identification;
• receiving, by the first PLC, a working instruction response returned by the MES based on the working instruction identification, wherein the working instruction response comprises working instruction type information;
• sending, by the first PLC, the working instruction type information to the host computer;
• and
• searching, by the host computer, working instruction contents based on the working instruction type information and sending the working instruction contents to a display device connected to the target workstation.