Mitsubishi PLC, how to use STL instructions

The Mitsubishi PLCSTL command is a stepper contact command that is used to "activate" a state. The usage is as follows: in a ladder diagram.

, a stepping state contact is drawn from the main bus, and the function of establishing a sub-bus is carried out so that all operations in that state are carried out on the sub-bus. The STL contact, which is generally connected to the left busbar, is a normally open contact, when a step is activated as an active step, the corresponding STL contact is turned on, and the circuit on the right is processed.

When the transition conditions after the step are satisfied, the transition is performed, and the state relay corresponding to the subsequent step is set and becomes the active step. At the same time, the status register corresponding to the original active step is reset, the STL contact is disconnected, and the subsequent load coil is reset (except for those driven by the SET command).

Correct format: contact ———set s0].

—stl s0]

The step s0 procedure.

Contact ———set s1].

—stl s1]

The Step S1 procedure.

Contact ———set s2].

—stl s2]

Step S2 procedure.

—ret] ladder diagrams are not very friendly to programmers, mainly because the way of thinking is different.

PLC supports Pascal-like languages. As far as I know, Siemens' PLC supports the SCL language, which is very close to a programming language, loops, functions, arrays, supports step-by-step debugging, and viewing variables. And there are some functions that the ladder can't do with the SCL can be done very well. Give it a try.

Mitsubishi PLC STL Instruction Usage:

1. STL instructions can enable programmers to generate programs whose processes and work are very close to sequential function diagrams. The meaning of the STL instruction is to activate a step (i.e., state), which is represented on the ladder diagram as a state junction that leads from the main bus. The stl command has the function of establishing a sub-bus, so that all operations in that state are performed on the sub-bus.

The step-to-return instruction ret refers to the end of the state process and is used to return to the main bus.

2. The STL contact is connected to the busbar, and the starting contact connected to the STL contact should use LD or LDI command. That is, after using the STL command, the LD point is moved to the right side of the STL contact until the next STL command or RET command appears. The RET command indicates the end of the entire STL program area, and the LD point returns to the original bus.

The circuits driven by the STL contacts are generally put together, and the RET command must be used at the end of the last STL circuit, otherwise there will be a "program error" message and the PLC will not be able to execute the user program.

3. STL contacts can directly drive or drive the coils and application instructions of Y, M, S, T and other components through other contacts. The Enter Stack (MPS) command cannot be used to the right of the STL contact.

4. STL instructions cannot be used with MC-MCR instructions.

1. Enter Mitsubishi PLC and click the open button to load your own related programs.

2. After the loading is successful, you need to select the view window in the menu bar.

3. At this time, you can click on the stl option in the upper left corner inside.

4. In this way, the input of STL instructions in Mitsubishi PLC can be realized.

The dtbl command is a positioning command for the setting method. For GX Developer software, set the action command on the positioning ** in advance, and then follow the specified action of the first macro **.

Common basic instructions for PLC:

1. LD: Take the command (normally open contact).

2. LDI: Take the reverse instruction (normally closed ridge Chang contact).

3. AND: Serial command (normally open contact).

4. ANI: Serial Reverse Instruction (Normally Closed Contact).

5. OR: and command (normally open contact).