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3-5-1 Terminal Blocks
The terminal block of an I/O Unit can be removed by loosening the mounting
screws.
Y
ou do not have to remove the lead wires from the terminal block in or
-
der to remove the block from an I/O Unit.
Terminal block mounting screws
Loosen the terminal block mounting screws to remove
the terminal block from the I/O Unit. Make sure the
mounting
screws on the terminal block
are tightened af
-
ter wiring is complete and the terminal block is re-
mounted to the I/O Unit.
3-5-2 Wiring Precautions
General
Electrical Noise Take
appropriate measures when any electrical device likely to produce noise is
connected
to the PC as a load. Devices generating noise of more than 1,200 V
(such as electromagnetic relays and valves) require noise suppression. For
noise
sources running on DC power
, connect a diode in parallel with the coil of
each device.
When
mounting a CPU Rack and an Expansion I/O Rack together on a mounting
plate, provide a ground to the mounting plate. The mounting plate must be
plated
with a highly conductive surface in order to ensure noise immunity.
Wiring I/O Units Section 3-5
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