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Remote Terminals
Section 5-1
Switch Settings
Rotary and DIP switches are used to enter settings.
Note
1.
Always turn the Slave OFF before changing DIP switch settings.
2.
In the SRT1 Series, pin 3 must always be left OFF. Otherwise, the Unit may
not function correctly.
3.
All pins marked “RSV” (reserved) must be left OFF. If any of them is ON,
the Unit may not function correctly.
Node Number Settings
The rotary switch specifies node numbers as hexadecimal numbers, as
shown below.
Note
1.
A 16-point I/O Slave is handled as a single 8-point Input Slave and a single
8-point Output Slave that possess the same node number.
2.
The actual node number setting range depends on the type of PLC in
which the Master is mounted as well as the Master’s settings. Refer to
for details.
Communications Mode Settings (SRT2 Series Only)
The communications mode is set with pin 3, as shown below.
The communications mode settings using pin 3 only apply to the SRT2 Series
and cannot be used with the SRT1 Series, which operate in High-speed Com-
munications Mode at all times.
Rotary Switch
DIP Switch
Reserved
(Always OFF)
Node number setting
Communications mode
setting (SRT2 Series)
or
Reserved (Always OFF)
(SRT1 Series)
Hold/Clear outputs for
communications error
Node number
Setting
(Hexadecimal)
Node number
Setting
(Hexadecimal)
0
0
8
8
1
1
9
9
2
2
10
A
3
3
11
B
4
4
12
C
5
5
13
D
6
6
14
E
7
7
15
F
Pin 3
Communica-
tions mode
Communica-
tions distance
Communica-
tions baud rate
Communica-
tions cycle time
OFF
High-speed Com-
munications
Mode
100 m max.
750 kbps
0.5 or 0.8 ms
ON
Long-distance
Communications
Mode
500 m max.
93.75 kbps
4.0 or 6.0 ms