Systems - Omron CJ - 09-2009 Operation Manual

Expanded System Configuration
System Configuration Example
Programming
Host computer
Console
OR
Communications settings
automatically detected
Host Link slave
2-5-2

Systems

Protocols
Protocol
Host Link (SYSMAC WAY)
slave
No-protocol (customer) com-
munications
Protocol macro
114
CX-Programmer
PT
NT Link
CPU Unit
Peripheral
port
RS-232C port
Refer to page 120 for a table showing which communications protocols are
supported by each Unit.
The serial communications port mode (protocol) can be switched in the CPU
Unit's PLC Setup. Depending on the protocol selected, the following systems
can be configured.
The following protocols support serial communications.
Main connection
Personal computer
OMRON Programmable Ter-
minals
General-purpose external
devices
General-purpose external
devices
Serial Communications Unit
Serial Communications Unit with unit Ver. 1.2 or later
CompoWay/F master
Modbus master
Host Link master
RS-232C port
Protocol macro
General-purpose external devices
(such as Temperature Sensor
Units, Bar Code Readers)
Use
Communications between
the Host computer and the
PLC. Commands can be
sent to a computer from the
PLC.
No-protocol communica-
tions with general-purpose
devices.
Sending and receiving mes-
sages (communications
frames) according to the
communications specifica-
tions of external devices.
(SYSMAC-PST is used to
create protocols by setting
various parameters.)
Section 2-5
CompoWay/F
or Modbus-
compatible
device
CPU Unit Host Link slave
Applicable commands,
communications
instructions
Host Link commands/ FINS
commands. Commands can
be sent to a computer from
the PLC.
TXD(236) instruction,
RXD(235) instruction,
TXDU(256) instruction,
RXDU(255) instruction
PMCR(260) instruction