8 model 3000 Ethernet Module / DS Connection Module Operation Manual
Chapter 2 Names of Parts and their Functions
2
Figure 2-3 Modules for 100BASE-TX/10BASE-T (EN751, EN761)
Figure 2-4 Module for 100BASE-TX/10BASE-T (EN751A) and DS connection module (FN711)
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EN751
module for 100BASE-TX/10BASE-T
single bus
EN761
module for 100BASE-TX/10BASE-T
dual bus
Status indicator LED
• RUN
•HLTH
•L-A
Status indicator LED
• RUN
•HLTH
•L-A
•L-B
Operation mode setting switches
Ethernet connector for 
(100BASE-TX/10BASE-T) line A
•EN-A
Serial communication port (RS-232C)
•TOOL
Station address setting switches
Ethernet connector for 
(100BASE-TX/10BASE-T) line B
•EN-B
A
B
C
D
E
F
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B
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EN751A
module for 100BASE-TX/10BASE-T
single bus
FN711
DS connection module 
(100BASE-TX/10BASE-T)
Status indicator LED
• RUN
•HLTH
•L-A
Status indicator LED
• RUN
•HLTH
•L-A
•L-B
Operation mode setting switches
Ethernet connector for 
(100BASE-TX/10BASE-T) line A
•EN-A
Serial communication port (RS-232C)
•TOOL
Station address setting switches
Ethernet connector for 
(100BASE-TX/10BASE-T) line B
•EN-B