
3.3 Multi-CPU Functions
Sub CPU Synchronization
3-98
Scan Set Values
The settings of the high-speed scans of the CPU Units must satisfy one of the following equations.
• High-speed scan set value of Main CPU Unit = High-speed scan set values of Sub CPU Units
• High-speed scan set value of Main CPU Unit = Integral multiple of high-speed scan set value of Sub
CPU Unit
If one of these equations is not satisfied, the Controller will operate without synchronizing the cycle
between the Main CPU Unit and Sub CPU Units.
Precautions When Using Sub CPU Synchronization
This section provides precautions that must be followed when you use Sub CPU synchronization.
Self Configuration
Self configuration is not performed for the Sub CPU Units even if you perform it for the Main CPU Unit.
To perform self configuration for a Sub CPU Unit, use the DIP switch on the Sub CPU Unit or connect the
MPE720 to the Sub CPU Unit. The procedure is the same as that for the Main CPU Unit. Refer to the fol-
lowing section for details.
Self Configuration (page 3-38)
Refer to the following manual for the connection procedure between a Sub CPU Unit and the MPE720.
MPE720 Version 7 System Integrated Engineering Tool for MP2000/MP3000 Series Machine Controller User’s Manual
(Manual No.: SIEP C880761 03)
You can check whether operation is currently synchronized or not in system register SB00040B
(CPU Status) in the Sub CPU Units.
• 0: High-speed scans synchronized.
• 1: High-speed scans not synchronized.
If you perform any of the following operations when the CPU Units are synchronized and the equa-
tions given in
are no longer satisfied, the CPU Units will change to non-
synchronous operation
1. Change the high-speed scan set value of the Main CPU Unit or a Sub CPU Unit.
2. Save the SVC Transmission Definition of a Sub CPU Unit.
3. Perform self configuration for a Sub CPU Unit.
4. Set bit C (network reset) in motion setting parameter OW
00 in a Sub CPU Unit to 1 (ON).
Also, if you perform any of items 2 to 4, above, MECHATROLINK communications will stop and the
position information and zero point return completion information will be lost. This will disable the
software limits.
If you loose synchronization or the software limits are disabled, use the following steps to reset the
CPU Units.
• If necessary, set the high-speed scan set values again.
• Enable the software limits.
• Turn the power supply to the CPU Units OFF and ON again.
Refer to the following manual for the procedure to enable the software limits.
MP3000 Series Motion Control User’s Manual
(Manual No.: SIEP C880725 11)
Information
Note