2-4 1:n connection among rs-422a ports, N connection among rs-422a ports – Omron Programmable Terminals NT631C User Manual
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Connecting to the Host’s RS-422A/485 Port
Section 5-2
5-2-4
1:N Connection among RS-422A Ports
The connection method in which the RS-422A ports of multiple NT631/
NT631Cs and one host are connected in a 1:N connection is described here.
Reference:
• Communications using the RS-422A standard NT link (1:N) method is
possible only when a Serial Communications Board is installed in a CS-
series PLC, a Serial Communications Unit is installed in a CS/CJ-series
PLC, a Communications Board is installed in a C200HX/HG/HE(-Z)E, or a
CQM1H-SCB41 Serial Communications Board is installed in a CQM1H.
• Communications using the RS-422A high-speed NT link (1:N) method is
possible only when a Serial Communications Board is installed in a CS-
series PLC or a Serial Communications Unit is installed in a CS/CJ-series
PLC.
NT631/NT631C
9-pin connector
CPU Unit
NT631/NT631C
NT631/NT631C
RS-422A cables
(max. total length 500 m)
CS/CJ-series PLC,
C200HX/HG/HE(-Z)E
Serial port B
(RS-422A/485, terminal block)