Omron EJ1

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Programless Communications Section 5-1
5-1 Programless Communications
Communications with PLCs from OMRON (SYSMAC CS/CJ Series) and Mit-
subishi Electric (MELSEC-Q/QnAS Series) can be performed without creating
ladder programs.
Using programless communications enables monitoring and changing set-
tings for the EJ1 by simply reading and writing to PLC memory. The EJ1 auto-
matically performs communications with PLCs so no time-consuming
communications programming is required.
5-1-1 Connectable Devices
SYSMAC CS/CJ Series
Note (1) Use only products manufactured on or after December 20, 1999.
For details, refer to the CS/CJ Series Serial Communications Boards/
Units Operation Manual (Cat. No. W336).
(2) Programless communications may stop if a momentary power interrup-
tion occurs at the CPU Unit when programless communications are being
used for a communications port on the CPU Unit. If they do stop, either
cycle the EJ1 power supply or execute a software reset.
TC4/2
Monitor
Settings
change
PV
Manipulated variable
Status
SP
Alarm value 1
Alarm value 2
HFU
PLC EJ1
The read monitor value is
written to the PLC memory.
The HFU reads the TC4
monitor value.
The HFU reads the value
written to the PLC memory.
The read setting is written
to the setting for the TC4.
Monitoring can be
performed for the
EJ1 and the settings
can be changed by
simply reading and
writing to memory.
No time-consuming
communications
programming required!
The HFU automatically
performs communications
with the PLC.
PV
Manipulated variable
Status
SP
Alarm value 1
Alarm value 2
PV
Manipulated variable
Status
SP
Alarm value 1
Alarm value 2
Name Model Communications port
Port 1 Port 2
Serial Communica-
tions Unit
CJ1W-SCU21-V1 RS-232C RS-232C
CJ1W-SCU41-V1 RS-422A/485 RS-232C
CS1W-SCU21-V1 (See note.) RS-232C RS-232C
Serial Communica-
tions Board
CS1W-SCB21-V1 (See note.) RS-232C RS-232C
CS1W-SCB41-V1 (See note.) RS-232C RS-422A/485
CPU Unit CJ1/CS1 Series --- RS-232C