IAI America REXT - Manual (Page 359)


Part 2 Startup Chapter
Chapter 5 Network Setup
327
Part 2 Startup Chapter
(1) Setting up the PLC
[1] Setting the switches on the serial communication unit (SCU)
For details, refer to the operation manual for your PLC.
The following explains an example with the serial communication unit CJ1W-SCU41-V1.
Model number: CJ1W-SCU41-V1
„ Setting the unit number
Set a desired unit number between 0 and F to assign I/Os for communication with high-function CPU units.
High-function CPU units are units that mainly provide communication functions and include serial communication units,
DeviceNet master units and controller link units. If two or more of these units are used, set a unique number for each unit.
According to the unit number settings, 25 channels of internal assignment area are allocated for each unit.
„ Turning the terminal resistor on/off
The terminal resistor should be turned on. Accordingly, set this switch to the right position (TERM/ON).
„ 2/4-wire mode selection
The 2-wire mode is used. Accordingly, set this switch to the left position (WIRE/2).
LED indicators
Terminal resistor ON/OFF switch
Unit-number setting switch
2/4-wire mode selector switch
Port 1
RS-422A/485
Setting switches
Port 1 is used.
Port 2
RS-233C
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