Omron EJ1 User Manual page 182

Connecting More Than One HFU
SYSMAC
CS/CJ-series PLC
RS-485
Pin
No.
1
2
6
8
Shell
The 2/4-wire switch is set
for a 2-wire connection.
Shield
Signal
RDA
RDB+
SDA
SDB+
FG
RS-485
2. Make the PLC settings.
Referring to item 2. Make the PLC settings. on page 119, set the maximum
unit number to one less than the number of connected HFU units. Other
settings are the same.
■
Example
If three HFUs are connected, set the maximum unit number to 2.
3. Make the EJ1 settings.
Make the following setting in all HFUs that are connected.
Variable type
F0/B0 Programless Communications Protocol
Refer to 5-1-3 Detailed Settings for information on data linked with the
PLC. Be sure that the areas of PLC memory used by the different HFUs do
not overlap.
INCORRECT
PLC Memory
HFU No. 0
Upload area
HFU No. 1
Upload area
EJ1N-HFU@-NFLK
B1
A1
B2
A2
B3
A3
B4
A4
B5
A5
B6
A6
B(+)
B7
A7
B8
A( )
A8
B9
A9
Parameter name
CORRECT
PLC Memory
HFU No. 0
Upload area
HFU No. 1
Upload area
Section 5-2
EJ1N-HFU@-NFLK
B1
A1
B2
A2
B3
A3
B4
A4
B5
A5
B6
A6
B(+)
B7
A7
B8
A( )
A8
B9
A9
Setting/Monitor values
2: NT Link (1: N)
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