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Chapter 2  Names of Parts
and their Functions
The front panels of the EN7 and FN modules and their explanations are shown in figure 
2-1 and figure 2-2.
Figure 2-1 Modules for 10BASE5 (EN711, EN721)
Figure 2-2 Modules for 10BASE2 (EN731, EN741)
EN711 
module for 10BASE5
single bus
EN721
module for 10BASE5 
dual bus
Status indicator LED
• RUN
•HLTH
•L-A
Status indicator LED
• RUN
•HLTH
•L-A
•L-B
Serial communication port (RS-232C)
•TOOL
Ethernet connector for (10BASE5) type A
•EN-A
Ethernet connector for (10BASE5) type B
•EN-B
12 VDC power receiving terminal board TB
•12 Vdc
• 0 V
•FG
EN731 
module for 10BASE2 
single bus
EN741
module for 10BASE2 
dual bus
Status indicator LED
• RUN
•HLTH
•L-A
Status indicator LED
• RUN
•HLTH
•L-A
•L-B
Serial communication port (RS-232C)
•TOOL
Ethernet connector for (10BASE2) type A
•EN-A
Ethernet connector for (10BASE2) type B
•EN-B