Omron CJ1W-SCU22, Руководство по эксплуатации, Страница: 80 / 478

2 Initial Settings and Allocations of Device Variable for CJ-series Unit
2-6
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Connector Pin Layout
*1 For 2-wire connections, use either pins 1 and 2 or pins 3 and 4.
*2 Pin 5 (the shield) is connected to the GR terminal on the Power Supply Unit though the Serial Communications
Unit. The Cable Shield can thus be grounded if you ground the GR terminal of the Power Supply Unit.
Precautions for Safe Use
The signal names SDA/B and RDA/B do not always have the same polarity as that shown above.
Check the polarity of the external device before you make connections.
Applicable Connectors
Plug:FMC 1.5/5-STF-3.5AU (screwless model by Phoenix Contact) or equivalent
MC1.5/5-STF-3.5AU (model with screw terminals by Phoenix Contact) or equivalent
Recommended Cables
CO-HC-ESV-3P
×
7/0.2 (by Hirakawa Hewtech Corp.)
Cable length: 1,200 m max. (multidrop connections)
z
Terminating Resistance Switch [TERM]
When an RS-422/485 port is used, set the switch to ON if the Serial Communications Unit is on the
end of the transmission line. Refer to Section 3 Installation and Wiring for the ON/OFF settings.
Note You can monitor the status of the terminating resistance setting with the device variables for CJ-series Unit.
For details, refer to 2-3-4 Device Variable for CJ-series Unit for Status.
z
2-wire or 4-wire Switch [WIRE]
When an RS-422A/485 port is used, set the switch to "2" when 2-wire connections are used, and set
the switch to "4" when 4-wire connections are used.
For details, refer to Section 3 Installation and Wiring.
Pin No.
Abbrevia-
tion
Signal name I/O
1 (*1) RDA Receive data - Input
2 (*1) RDB Receive data + Input
3 (*1) SDA Send data - Output
4 (*1) SDB Send data + Output
5 (*2) FG Shield ---
Label Name Settings Factory setting
TERM Terminating resis-
tance switch ON: Terminating resistance ON
OFF: Terminating resistance OFF OFF: Terminating resistance OFF
Label Name Settings Factory setting
WIRE 2-wire or 4-wire switch 2: 2-wire
4: 4-wire 2: 2-wire
1
2
3
4
5