2. Wiring of PCS-DS51
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Backup cable wiring of the serial bus cable
Since the serial bus is redundant (as standard), two units of serial bus cables for A system and B
system are used. Install the backup cable for each cable so that you can deal with the situation
where the cable is damaged (broken) due to an accident.
Cover the cables with oilpaper to protect them to avoid corrosion and faulty contact at the crimp
terminals of both ends of the backup cable.
Wiring inside the cabinet
Separate the serial bus cable away from the power supply cable more than 50 cm. When distance
of more than 50 cm is not possible, use the shield zipper tube to shield it as one unit and separate
it at least 10cm and connect both ends of the shield to the SHIELD terminal.
After wiring, fix the cable so that any forces due to the cable’s weight and bending are not
directly exerted to the terminal process part and/or terminal board.
Cautions on wiring outside the cabinet
As a general rule, the wiring of the serial bus cable should be done inside the same cabinet or
between the neighboring cabinets. When wiring outside of the cabinet for an unavoidable reason,
use the dedicated metal duct and perform tubing work to protect the cable and eliminate external
noises. The total wiring length of the cable should be within 30 meters.
The installation by using ducts is performed as described in the following.
1)
Use a pull box where the cables are connected or duct lines with different radius are
connected.
The length of the duct line between neighboring pull boxes should be within 20 meters.
When the duct lines are straight and on the same horizontal plane, the length may be within
25 meters.
2)
The number of bending parts in one section should be within 3. The total bending angle
should be within 180 degrees.
3)
The metal duct should be grounded (grounding for Type 3).
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