C
P
4.
SElTINGS
AND
PROCEDURES
I:
BRm
*
/.
::
OPERATION
6
.f,
MELSEGA
4.5
External
Wiring
4.5.1
ptecauticm
during
wiring
External wiring which is resistant to external noise effects is a prerequisite for
reliable AJ71 C24 operatlons (full use of all available functions).
When doing external wiring of the AJ7lC24, the following precautions must
be taken:
(1)
Keep main circuit wiring, high-voltage wiring, and other load-carrying
wiring outside the
PC
CPU
separate from A171 C24 wiring. Never bundle
them together. This prevents noise and surge-induction effects.
(2)
Ground the shield of shielded wires and cables at only one point.
(3) The RS-422 terminal has M4 screw connectors. Fasten sultably-sized
crimped terminals to the ends of the cables before connecting the cables
to the terminals.
Precautions and examples
of
connections to an RS-232C connector is shown
in the diagram below.
(1)
Precautions during connections
(a) If the FG and SG terminals are connected inside a device connected
to the RS-232C connector, do not use terminal No.
1
of the RS-232C
connector of the AJ71 C24.
(b) If half-duplex transmission (see Section 7.2 for the setting method)
is used, perform wiring
so
that the CD signal of the AJ71C24 can be
controlled by the external device.
Also, set the AJ71 C24
to
execute the CD terminal check (see Section
7.1).
Section 5.4 gives the ON/OfF timing control of the CD signal of the
AJ71 C24 using the external device.
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