Omron EJ1 User Manual page 43

Wiring Terminals
Event Inputs
Communications
22
Connect event inputs across terminals A4 and A6 for the TC2 and terminals
A1 and A6 for the HFU.
B1
A1
B2
A2
B3
A3
B4
A4
B5
A5
B6
A6
B7
A7
B8
A8
B9
A9
TC2
B1
A1
B2
A2
B3
A3
B4
A4
B5
A5
B6
A6
B7
A7
B8
A8
B9
A9
HFU
• The inflow current is approximately 4 mA.
• Use event inputs under the following conditions:
Contact inputs
Non-contact
inputs
• For communications with the host, connect communications across termi-
nals B7 and B8 or terminals A7 to A9 on the HFU or connect across ter-
minals 1 and 2 or terminals 6 and 7 on the EDU.
B1
A1
B2
A2
B3
A3
B4
A4
B5
A5
B6
A6
B7
A7
B8
A8
B9
A9
HFU
1
2
3
4
5
6
7
8
9
EDU
Note • If there are problems with communications noise performance when using
the port A connector, connect 110 to 125 Ω of terminating resistance
across terminals 1 and 2 of port A on the EDU.
A1
A2
A3
A4
A5
A6
Contact inputs
ON: 1 kΩ max., OFF: 100 kΩ min.
ON: Residual voltage: 1.5 V max., OFF: Leakage current: 0.1 mA
max.
RDB (+) B (+)
B7
RDA (−) A (−)
B8
RS-422 RS-485
Port C communications
B (+)
1
A (−)
2
RS-485 port A
communications
Section 2-2
+
A1
EV4
+
A2
EV3
−
A3
+
A4
EV2
+
A5
EV1
−
A6
Non-contact inputs
SD
A7
RD
A8
DO NOT USE
SG
A9
RS-232C RS-422
HFU
B (+)
6
A (−)
7
RS-485 port B
communications
EDU
EV4
EV3
EV2
EV1
SDB (+)
SDA (−)