Omron CP1L-EL20DR-D, Operation Manual

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Serial Communications Section 8-3
CPU Unit Serial Gateway Function Specifications
Note If a CJ-series Serial Communications Unit is connected via a CJ Unit Adapter,
messages can also be converted to Modbus-ASCII or Host Link FINS. Refer
to the SYSMAC CS/CJ Series Serial Communications Boards/Units Opera-
tion Manual (W336) for details.
8-3-5 Serial PLC Links
Overview
Serial PLC Links can be used to allow data to be exchanged among CP1L-
EL/EM 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-EL/EM CPU
Unit, but the number of linked words can be set to fewer words. (The size
must be the same for all CP1L-EL/EM 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.
Item Specification
Pre-conversion data FINS (via FINS network, Host Link FINS, toolbus, NT Link,
or CPU bus)
Conversion functions FINS commands addressed to serial port 1 or 2 on the CPU
Unit are converted to CompoWay/F commands (after
removing the header) if the FINS command code is 2803
hex and to Modbus-RTU commands (after removing the
header) if the FINS command code is 2804 hex.
Post-conversion data CompoWay/F command or Modbus-RTU command
Serial communications
method 1:N half-duplex
Maximum number of
nodes 31
Enabling serial commu-
nications mode Serial Gateway Mode
Response timeout The time from when a message converted to a different pro-
tocol is set until a response is received is monitored by the
serial gateway function.
Default: 5 s, User setting: 0.1 to 25.5 s
Note A FINS response code of 0205 hex (response time-
out) is sent to the source of the FINS command if a
timeout occurs.
Send delay function None