Omron CP1L - 12-2007, Operation Manual

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343
Serial Communications
Section 6-3
Serial PLC
Link CP-series CPU Units or CJ1M CPU Units Up to ten words per Unit can
be shared by up to nine CPU
Units, including one Polling
Unit and eight Polled Units.
An RS-422A/485 Option
Boards (CP1W-CIF11) are
used to communicate via RS-
422A/485, or RS-232C Option
Boards (CP1W-CIF01) can be
used to communicate between
two CPU Units via an RS-232C
connection.
CJ1M CPU Units can also be
included in Serial PLC Links,
and the Serial PLC Links can
also include PTs as Polled
Units via 1:N NT Links.
Note Serial PLC Links can be
created on serial port 1
or serial port 2, but not
on both ports at the
same time.
OK OK
1:N NT links
(1:N NT
Links are
also used for
1:1 connec-
tions.) OMRON PTs (Programmable Terminals) Data can be exchanged with
PTs without using a communi-
cations program in the CPU
Unit. OK OK
Host Link Host computer or OMRON PT (Programmable Terminal) 1) Various control commands
such as reading and writing
I/O memory, changing the
operating mode, and force-
setting/resetting bits can be
executed by sending C-
mode host link commands
or FINS commands from the
host computer to the CPU
Unit.
2) It is also possible to send
FINS commands from the
CPU Unit to the host com-
puter to send data or infor-
mation.
Use Host Link communica-
tions to monitor data, such as
operating status, error informa-
tion, and quality data in the
PLC or send data, such as pro-
duction planning information, to
the PLC.
OK OK
Protocol Connected devices Description Serial
port 1 Serial
port 2
CP1L CPU Unit
Polling Unit
RS-422A/485 Option Board
RS-422A/485
Shared data
CP1L CPU Unit
Polled Unit
CP1L CPU Unit
Polled Unit
NS-series PT
RS-232C
NT Link
CP1L CPU Unit
Personal computer
RS-232C
Host Link