Omron CP1L - 12-2007, Operation Manual

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Serial Communications
Section 6-3
6-3-5 Serial PLC Links
Overview
Serial PLC Links can be used to allow data to be exchanged among CP1L
and CJ1M CPU Units via the RS-422A/485 or RS-232C Option Boards
mounted to the CPU Units without requiring special programming. The com-
munications mode in the PLC Setup must be set to the Serial PLC Link Mode
to enable this functionality.
• Either serial port 1 or 2 can be used. (See note.)
• Words are allocated in memory in the Serial PLC Link Words (CIO 3100
to CIO 3199).
• A maximum of 10 words can be transferred by each CP1L CPU Unit, but
the number of linked words can be set to fewer words. (The size must be
the same for all CP1L CPU Units.)
Note Serial PLC Links cannot be used on serial ports 1 and 2 at the same time. If
one port is set as a Serial PLC Link slave or master, it will not be possible to
set the other port for a Serial PLC Link. A PLC Setup error will occur if an
attempt is made to set both ports for Serial PLC Links.
Configuration
1:N Connections between CP1L/CJ1M CPU Units (8 Nodes Maximum)
1:1 Connections between CP1L/CJ1M CPU Units
8 nodes maximum
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)
CJ1M CPU Unit
(Polled Unit)
CP1L CPU Unit
(Polled Unit)
CP1L CPU Unit
(Polling Unit)
RS-232C or RS-422A/485
Shared data
CP1L CPU Unit
(Polled Unit)
CJ1M CPU Unit
(Polling Unit)
RS-232C or RS-422A/485
Shared data