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4.
SETTINGS AND PROCEDURES BEFORE OPERATION
MELSEC-A
4.5.3
Connecting the
RS-422
connectors
When connecting to an RS-422 connector, the following precautions must be
taken. Connection examples are given in the diagram below.
(1)
Precautions during connections
(a) To transmit FG and SG signals of the AJ71C24 t o an external device,
perform connections conforming t o the specifications of the external
device.
(b) The following example uses a 1:l connection ratio between a com-
puter and an AJ71C24.
Section 4.5.4 explains l : n ("nu is up to 32) and m:n connection ratios
(total of "mu and "n" is a maximum of 32) between computers and
AJ71C24 modules.
(2)
Example
I
'1: Section 3.2.3 gives the signal assignment
of
the RS-422 terminal
on the AJ71C24.
I
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