The motion control command system of Siemens S7-1200 PLC covers a variety of core functions to meet different automation needs. Here's a closer look at these directives:
MC_ActivateDeactivateAxis (Axis Activation/Axis Deactivation): This command allows the user to activate or deactivate a specific axis. When an axis is deactivated, all motion control operations associated with it are paused. When activating an axis, the user specifies the name of the axis and the activation signal.
MC_Acknowledge (Error Acknowledgment): This instruction is designed to handle the error state of the axis. Once an error occurs on the axis, this command clears the error state and attempts to restart the axis. When executing this command, you need to specify the identification of the axis and the reset signal.
MC_GoToHome (Homing Operation): This command is responsible for moving the axis to a preset origin position. Before executing, the user needs to define the origin location. When operating, you need to specify the identification and origin position of the axis explicitly.
MC_Pause (Axis Pause): This command allows the user to pause the current motion of the axis. In the paused state, the shaft can be restarted to continue previous motion. When using this command, you specify the designation of the axis and the pause signal.
MC_MoveToAbsolutePosition (Absolute Positioning): This command is used to move the axis to a specific absolute position. Before executing, you need to define a reference point and establish a coordinate system. By setting the parameters Position and Speed, the axis can reach the specified position precisely. When operating, the designation, target position, and speed of the axis should be clearly specified.
MC_MoveByRelativeDistance (Relative Positioning): Unlike absolute positioning, this command moves the axis relative to the current position. By setting the parameters Offset and Speed, the axis can be moved to a relative position. When executing, you need to specify the designation, offset, and speed of the axis.
MC_MoveToVelocity (move at a preset speed): This command moves the axis to the target position at a specific speed. By setting the parameters Velocity and Destination, the axis can reach the designated place smoothly. When operating, the designation, speed, and target position of the axis should be clearly specified.
MC_Jogging (Jog Operation): This command allows the user to jog control the axis. By entering the jog speed and setting the JogForward or JogBackward signal, the axis can start moving. When these signals are reset, the jog operation will stop. When using this command, you specify the designation, jog speed, and direction of the axis.
MC_AdjustDynamics (Dynamic Parameter Adjustment): This command allows the user to adjust the dynamic parameters of the motion of the axis, such as maximum velocity, acceleration, etc. When executing, you need to specify the identity of the axis and the value of the dynamic parameter that you want to set up.
MC_SetParameter (Process Object Parameter Write): This instruction is used to write parameters to process objects such as axes. When operating, you need to specify the name of the process object and the parameter values to be set.
MC_ReadParameter (Process Object Parameter Reading): This instruction allows the user to read the current parameter values of the process object, such as the position of the axis, speed, etc. When executing, you need to specify the name of the process object and the type of parameter to be read.
MC_Override (Emergency Control): In some emergency situations, such as during commissioning, this command allows the user to control the axis directly. When executing, it is necessary to specify the identification of the axis and the emergency control signal.
When using the motion control commands of the Siemens S7-1200 PLC, the following points are worth noting:
1. According to the characteristics of the motor and drive, select the most suitable motion control instructions and parameter settings.
2. In the process of debugging, gradually optimize the program logic to ensure the accuracy and performance of motion control.
3. Carefully follow the instructions and restrictions to ensure the safety and correctness of the operation.
4. When the program is running, check the status and value of each parameter regularly in order to find and solve the problem in time.
5. In the high-precision and high-speed control scenario, special attention is paid to the stability and reliability of the control system.
6. Avoid using the same DB block to store different motion control instructions.
7. Select the appropriate process function, such as MC_ActivateDeactivateAxis for the activation/deactivation of the shaft.
8. Before using motion control commands, make sure that the reference point has been set correctly and the coordinate system has been established.
9. Set the motion parameters according to the actual needs, such as position, speed, acceleration, etc., and reasonably set the emergency control signal.
10. When using the jog mode, pay special attention to the setting of jog speed and direction.
11. Always pay attention to safety factors to ensure that the control system is stable and reliable.
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