YASKAWA SVC - 6.6.11 Precautions

6.6 Slave CPU Synchronization
6.6.11 Precautions
6-30
6.6.11 Precautions
Observe the following precautions when you use slave CPU synchronization.
• To use slave CPU synchronization, you cannot use a PO-01 or MPU-01 Option Module on
the slave. If a PO-01 or MPU-01 is used, disable slave CPU synchronization.
• If you change the SVC Function Module settings from a slave to a master, save the settings to
flash memory, and then turn the power supply OFF and ON again.
• When the status changes between asynchronous to synchronous for the slave CPU synchro-
nization, there may be a delay of up to one scan cycle (i.e., the scan cycles may be disturbed)
for the high-speed and low-speed scans on the slave. For applications that require regularity
or periodicity, do not use the data while switching to slave CPU synchronized status.
• If the SVA-01 is mounted in a slot on the slave’s Base Unit, operation may be affected when
changing to slave CPU synchronized status, e.g., the axis may be subjected to shock. In this
case, stop operation in advance.
• If the SVB-01 or SVC-01 is mounted in a slot on the slave’s Base Unit, communications with
the slave connected to the SVB-01 or SVC-01 are disconnected and then reconnected when
changing to slave CPU synchronized status. If a servo, inverter, or similar slave device is con-
nected, stop operation in advance. The disconnection of communications may cause the
axes to stop suddenly or subject the machine to shock.
• If the LIO-01, LIO-02, LIO-06, or CNTR-01 is mounted in a slot on the slave’s Base Unit, the
counter value may be disrupted when changing to slave CPU synchronized status. Do not
use the counter value while this change is being made.
• If the version of the CPU Unit/CPU Module of the master or slave MP3000 is lower than ver-
sion 1.06, the MP3000 Controllers will operate asynchronously.