Omron EJ1 User Manual page 199

Determining the Error from the Current Situation for Communications Errors
The Smart Active Part (SAP)
does not communicate with
the EJ1.
Connection
(RS-485)
or
CJ1W-CIF11
RS-422A Converter
(RS-485)
Connection port
PT
PLC
SCU
EJ1
(EDU)
Note
178
Status
There is no power supply to the
EJ1.
The SAP is not compatible with
the EJ1.
The SAP is not for serial con-
nection.
The Serial Communications
NS-series
Board (SCB)/Unit (SCU) and
the EJ1 communications set-
tings do not match.
PLC
CS/CJ
SCB/SCU
EJ1
NS-series
PLC
CS/CJ
SCB/SCU
EJ1
Connection
port
---
---
---
Port B
There is an HFU connected to
the EJ1.
The baud rate and communications distance sometimes depend on the com-
munications partner.
Possible cause
Supply power from the EDU power
supply terminal.
Use an SAP for the EJ1.
Use an SAP for serial Programmable
Terminal connection.
Set the Serial Communications
Board's or Unit's baud rate the same
as the port B baud rate.
Hint:
The EJ1 baud rate is set under the Port B Communications
Baud Rate parameter.
• The available baud rate settings are 9.6 kbps (default),
19.2 kbps, 38.4 kbps, 57.6 kbps, and 115.2 kbps. (See note.)
• Set the other parameters the same as the Serial Communi-
cations Unit as well, i.e., data length (7), parity (even), and
stop bits (2).The values in parentheses are the default set-
tings.
Refer to the PT and PLC manuals for PT and PLC communi-
cations settings. See Related Manuals on page xiv.
Set the communications conditions for the Serial Communica-
tions Unit as follows:
• User/default settings:
• Serial communications mode: Serial Gateway
• Data length:
• Stop bits:
• Parity:
• Baud rate:
Refer to the CX-Integrator Operation Manual (W445) for
details.
Note The Serial Communications Board (SCB)/Unit (SCU)
must be unit version 1.2 or later. Refer to Unit Versions
of CS/CJ-series Serial Communications Boards/Units in
the Serial Communications Board/Unit Operation Man-
ual (W336) for information on checking unit versions.
Port B cannot be used for communi-
cations if an HFU is connected to the
EJ1.
Hint:
When Using HFUs
Connect to port A on the Serial Communications Unit.
The following restrictions apply:
• The HFU cannot be used at the same time as the EST2-2C-
MV3 CX-Thermo Support Software.
• The baud rate is fixed at 38.4 kbps.
If an HFU Is Not Required
Disconnect the HFU and restart the EJ1.
Section 7-4
Countermeasure
User settings
7 (bit)
2 (bit)
Even (bit)
Set the same baud rate as the
EJ1.