161
Determining the Error from the Current Situation for Communications Errors
Section 7-4
Programless
Communications
No Programless Communications between the PLC and the EJ1G
Status
Possible cause
Countermeasure
No communications between
the PLC and the EJ1G.
Connection
Connection port
There is no power supply to
the EJ1G.
Supply power from the EDU power
supply terminal.
The Serial Communications
Board (SCB)/Unit (SCU) wir-
ing is incorrect.
Refer to the respective manuals and
wire the connection correctly.
See Related Manuals on page xiv.
The port C communications
are set to RS-485.
Turn ON pin 8 on the HFU settings
switch 2 (SW2) to set to RS-232C.
The Serial Communications
Board (SCB)/Unit (SCU) RS-
485 port is connected to the
EJ1G RS-232C port.
Connect the SCU RS-232C port to
the EJ1G RS-232C port.
The EJ1G programless com-
munications parameters are
incorrect.
Refer to 5-6 Programless Communi-
cations in SECTION 5 Advanced Unit
(HFU) Functions and check the set-
tings.
The Serial Communications
Board (SCB)/Unit (SCU) com-
munications settings are
incorrect.
Same as above.
No communications between
the PLC and the EJ1G.
Connection
or
Connection port
There is no power supply to
the EJ1G.
Supply power from the EDU power
supply terminal.
The Serial Communications
Board (SCB)/Unit (SCU) wir-
ing is incorrect.
Refer to the respective manuals and
wire the connection correctly.
See Related Manuals on page xiv.
The port C communications
are set to RS-232C.
Turn OFF pin 8 on the HFU settings
switch 2 (SW2) to set to RS-485.
The Serial Communications
Board (SCB)/Unit (SCU) RS-
232C port is connected to the
EJ1G RS-485 port.
Connect the SCU RS-485 port to the
EJ1G RS-485 port.
Alternatively, connect the RS-422A
Converter to the RS-232C port to
convert to RS-485, then connect to
the EJ1G RS-485 port.
The EJ1G programless com-
munications parameters are
incorrect.
Refer to 5-6 Programless Communi-
cations in SECTION 5 Advanced Unit
(HFU) Functions and check the set-
tings.
The Serial Communications
Board (SCB)/Unit (SCU) com-
munications settings are
incorrect.
Same as above.
EJ1G
(RS-232C)
PC
PLC
CS/CJ
SCB/SCU
Connection
port
SCU
---
EJ1G
(HFU)
Port C
(RS-232C)
EJ1G
(RS-485)
PC
PLC
CS/CJ
SCB/SCU
EJ1G
(RS-485)
PC
PLC
CS/CJ
SCB/SCU
CJ1W-CIF11
RS-422A Converter
Connection
port
SCU
---
EJ1G
(HFU)
Port C
(RS-485)
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: ......