93
Programless Communications
Section 5-6
5-6
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 EJ1G by simply reading and writing to PLC memory. The EJ1G
automatically performs communications with PLCs so no time-consuming
communications programming is required.
5-6-1
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 EJ1G power supply or execute a software reset.
Monitor
Settings
change
PV
Manipulated variable
Status
SP
Alarm value 1
Alarm value 2
HFU
PLC
EJ1G
The read monitor value is
written to the PLC memory.
The HFU reads the value
written to the PLC memory.
Monitoring can be
performed for the
EJ1G 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
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
CS/CJ Series
---
RS-232C
Summary of Contents for EJ1G
Page 3: ...iv ...
Page 17: ...xviii ...
Page 21: ...xxii ...
Page 53: ...32 Unit Configuration Examples Section 2 4 ...
Page 69: ...48 Changing SPs During Operation Section 3 3 ...
Page 81: ...60 Other Functions Section 4 5 ...
Page 145: ...124 Other HFU Functions Section 5 7 ...
Page 167: ...146 Detailed Description of Services Section 6 4 ...
Page 229: ...208 Parameters That Can Be Allocated for Programless Communications Appendix ...
Page 237: ......