Yaskawa MP920 Communications Module - Manual (Page 313)

D.4 Wiring Optical Fiber Cables
D-21
D
Direct Connection Method
This method directly connects optical fiber cables outside a control panel to optical connec-
tors inside the control panel.
„ Calculating the Maximum Transmission Distance
The maximum transmission distance differs according to the method for connecting optical
fiber cables inside a control panel to optical fiber cables outside the control panel or connect-
ing optical fiber cables between control panels (fusing connection or connector relay connec-
tion) as well as the connection position.
Calculating the Maximum Transmission Distance for the 215IF
Repeater-TS2
Where,
PL = Po - Pi - Pm (dB)
= -18 + 28 - 1.5
= 8.5 (dB)
PL: Allowable loss for optical sending and receiving (8.5 dB)
Po: Optical sending level (-18 dBmp)
Pi: Optical receiving level (-28 dBmp)
Control panel Two-core crystal glass
optical fiber cable Control panel
Terminal box Terminal box
Optical Repeater
Optical connector: FC
Optical Repeater
Optical connector
Conversion Adapter: 0D-9384, manufactured by NEC
Control panel Two-core crystal glass
optical fiber cable Control panel
Optical Repeater Optical Repeater
Optical connector
(km)
Pc (dB / km)
PL - Ps - Pa (dB)
= L