Mitsubishi Electronics SW2D5C-GTD2-E Manuale Utente

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2.5   Connection Cable
2.5.1   Connecting to MITSUBISHI PLC
Precautions for using USB cable
(1) Before using USB cable
The USB cable can be used with the USB driver already installed.
(2) Number of connectable programmable controllers when using USB cable
A single programmable controller can be connected when using the USB cable.
The following shows the system configurations, which do not meet the above 
conditions.
(3) Precautions for connecting programmable controller
Connect or remove the USB cable, reset a programmable controller or turn the 
power on/off after stop the monitor.
(
If operated without stop, a communication timeout occurs, which cannot be fixed.
If not fixed, remove the USB cable completely. After 5 seconds or more, reconnect 
the cable. (The error may occur at first communication after the above operation. 
From the next time, the programmable controller functions normally.)
QCPU (Q mode)
USB cable
QCPU (Q mode)
USB cable
Connecting from a personal computer with multiple USB ports to  
multiple QCPUs (Qmode)
QCPU (Q mode)
USB cable
USB cable
QCPU (Q mode)
USB cable
Connecting from a personal computer to multiple QCPUs (Q mode)  
through USB hub
USB hub