Toshiba nv Series Instruction Manual page 34

Chapter 2 Installation and Wiring
Connect the base unit connection cable and cable terminating
connector.
Connect the power terminal block of the base unit (BU901) of the
SA9A1.
14
6F8C1511
Connect the cable terminating connector to the base unit at the both ends of
the TC-net I/O bus.
Normally, the base unit BU901 of the SA9A1 is located at the end of the
TC-net I/O bus. Connect the terminating connector to the TC-net I/O bus
connection connector (upper termination）, and connect the other end to the
TC-net I/O bus connection connector (lower termination) of the end I/O base
unit.
It can also be used in a configuration in which the BU901 is located at the
center between the TC-net I/O buses with I/O base units at both ends.
In this case, install a terminating resistance to the I/O base units at both ends.
The base units must be almost in contact. Connect them with the unit
connection cable.
Connect 24VDC, 0V, and FG (Class D dedicated ground) to the power terminal
block of the base unit (BU901) of the SA9A1. (the screw size for these wiring
terminals is M3.5).
Figure 2-2 Power terminal block of the base unit BU901
Do not share the 24VDC power supply for
CAUTION
the BU901 with the power supply for other
I/O.
If it is shared with the power supply for other I/O, it may
cause malfunction or failure of the modules.
Prohibited