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127
Programless Communications
Section 5-1
• RS-485
• If noise immunity is a problem in communications, connect terminating
resistance of 110 to 125
Ω
to pins 6 and 7 of port B on the EDU.
2.
Make the PLC settings.
When using an An/AnS-series PLC, use the switches on the front of the
Computer Link Unit to make the settings shown in the following table.
Note
(1) This setting is not used on the A1SJ71UC24-R2 or A1SJ71UC24-PRF.
(2) If any other settings are used, change the setting for the EJ1 to the same
settings.
(3) Refer to the user’s manual for the PLC for setting methods.
RS-485
RDB (+)
RDA (
−
)
B1
B2
B3
B4
B5
B6
B7
B8
B9
A1
A2
A3
A4
A5
A6
A7
A8
A9
EJ1N-HFU
@
-NFLK
SDA
SDB
RDA
RDB
FG
RS-485
R
R
Signal
Shield
MELSEC
An/AnS/FX3UC-series PLC
Switch
Setting
Station setting
00
Mode setting
Special protocol format 4
Transfer specifications
Data bits
8 bits
Parity bit
Yes
Even/odd parity
Even
Stop bits
1 bit
Checksum
Yes
Write during RUN
Allowed
Computer link/multidrop link
(See note 1.)
Computer link
Communications rate
19.2 kbps
Summary of Contents for EJ1 EtherCAT
Page 2: ...EJ1 Modular Temperature Controllers User s Manual Revised July 2008 ...
Page 3: ...iv ...
Page 19: ...xx ...
Page 213: ...188 Detailed Description of Services Section 6 4 ...
Page 227: ...202 Detailed Description of Services Section 7 5 ...
Page 303: ...278 Index ...
Page 305: ......