Siemens QUADLOG, Installation And Service Instruction, Page: 38 / 66

INSTALLATION SD39RIO-1
January 2001
2-26
3. At the appropriate IOBUS screw terminals on the Remote I/O Rack’s backplane (Figure 2-4), provide
strain relief for the W2040 and 8627 cable ends by securing them to the rack’s tie points (Figure 2-5).
Connect the W2040 and 8627 cable conductors (wires) to the appropriate screw terminals. Tighten screw
terminals by applying 78 in oz (0.55 Nm) of torque. Wire stripping and color code information for
making connections are provided in Table 2-1, and Figures 2-14 and 2-17. Note that W2040 cable
conductors are twisted together and shielded, but this is not required for 8627 cable conductors.
4. Make sure the conductors of each end of a W2040 or 8627 IOBUS extension cable matches up to
identically color-coded conductors at the other end.
5. Tag each W2040 and 8627 cable end as needed for identification.
To connect W2040 and 8627 IOBUS cables between two Remote I/O Racks:
1. Determine the length of W2040 and 8627 cables needed to connect from the first Remote I/O Rack to the
second Remote I/O Rack. Allow slack for cable stripping, dressing, tagging, and strain relief at each end.
2. At the appropriate IOBUS OUT screw terminals on the first Remote I/O Rack’s backplane (Figure 2-4),
provide strain relief for the W2040 and 8627 cable ends by securing them to the rack’s tie points (Figure
2-5). Connect the W2040 and 8627 cable conductors (wires) to the screw terminals as shown in Figure 2-
19. Tighten screw terminals by applying 78 in oz (0.55 Nm) of torque. Wire stripping and color code
information for making connections are provided in Table 2-1, and Figure 2-14 and 2-17.
3. At the appropriate IOBUS IN screw terminals on the second Remote I/O Rack’s backplane (Figure 2-4),
provide strain relief for the W2040 and 8627 cable end by securing them to the rack’s tie points (Figure
2-5). Connect the W2040 and 8627 cable conductors (wires) to the screw terminals as shown in Figure 2-
19. Tighten screw terminals by applying 78 in oz (0.55 Nm) of torque. Wire stripping and color code
information for making connections are provided in Table 2-1, and Figure 2-14 and 2-17.
4. Tag each W2040 and 8627 cable end as needed for identification.