3. Cabling
3-88
TI 33Q01J10-01E
3.8 Connecting Bus Cable
1. When the sheath of the control-bus cable is connected, there is a possibility that (ground
loop) currents will flow in the sheath.
2. Before connecting a V net splitter (N-type or BNC-type) to coaxial cable, use the following
method to drain static electricity: wear a wrist strap. If the cable is already connected to
other stations, this is not necessary.
• Momentarily short the cable inner conductor to the outer sheath.
• Next connect the cable to the coupler.
V net
The following is an example of connecting a control bus.
• Attach a T-shaped plug to the BUS1 and BUS2 BNC connectors of the control bus interface
card. Order the T-shaped plug separately.
• Connect V net cables (10BASE-2 cable: YCB141) to the BUS1 and BUS2 through previous
station.
• Connect V net cables (10BASE-2) from the other side of the T-shaped plug to next station.
• When connecting V net cable (10BASE-5 cable: YCB111) to next station, place a
connection unit (YCB147) between V net cable (YCB141) and V net cable (YCB111). Order
a connection unit separately.
• When no next station is connected, attach YCB148 V net Terminator for 10BASE-2 cable
and YCB118 for 10BASE-5 cable.
In this document, 10BASE-5 and 10BASE-2, terminology of Ethernet, are use to describe the V
net cables for easier understanding. Actually, V net is different from Ethernet.
Yokogawa’s YCB111 and YCB141 cables should be used instead of 10BASE-5 and 10BASE-2
cables.
May 18, 2007-00
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