Omron NT-series Programmable Terminal V022-E3-1 - Manual (Page 62)

Reference

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Section 2-6
Connection Diagram
As shown in the figure below, connect multiple NT600S units to one PC. In an NT
link (1:N), up to eight NT600S units can be connected to one PC port.
C200HX/HG/HE
OMRON PC
While controlling machinery and
monitoring lines, controls the
NT600S units when necessary.
C200HX/HG/HE can be used.
RS-232C cable
(max. length: 2 m), or
directly connected
RS-422A/485 cable
RS-232C/RS-422A
converter unit,
type NT-AL001 RS-232C/RS-422A
converter unit,
type NT-AL001
RS-232C cable
(max. length: 2 m) RS-232C cable
(max. length: 2 m)
RS-422A/485 cable (*1) RS-422A/485 cable (*1)
(Up to eight NT600S units can be connected.)
NT600S NT600S
RS-232C/RS-422A converter
unit, type NT-AL001
(Not required if the connection is
made at the RS-422A/485 port.)
(*1) Total cable length: 500 m
(*2) For connection to an
NT600S-ST121(B)-EV3, a
separate power supply is
required.
+5V (*2)
(150mA) +5V (*2)
(150mA)
[Maximum Number of NT600Ss Connectable to One Port]
The maximum number of NT600S units that can be connected to the RS-232C
port (built in the CPU) and the A and B ports in the communication board is indi-
cated below.
 C200HE :Up to 4 NT600S units per port (unit Nos. 0 to 3)
 C200HG, C200HX :Up to 8 NT600S units per port (unit Nos. 0 to 7)
 When NT600S-ST121(B)-EV3 is connected in the configuration shown in the
figure above, a separate +5 V (150 mA) power supply is required to drive the
RS-232C/RS-422 converter units (NT-AL001). When NT600S-ST211(B)-EV3
is connected, the power to the converter unit can be supplied from the PT itself,
so no separate power supply is required.
 When connecting the C200HX/HG/HE and an RS-232C/RS-422A converter
unit, use a converter unit whose lot number is 15Y5 or later. Converter units of
lot numbers previous to 15Y5 cannot be connected.