Westermo ODW-610-F1 - Manual (Page 9)

9 6651-22601
Single- or multimode LC fibre connectors
ODW-610-F1 uses Small Form Factor Pluggable (SFP) transceivers that are in compliance
with Multi-Sourcing Agreement (MSA). A wide range of different fibre transceivers and
connectors can be used.
Status port
This port enables supervision of fibre optical link status by a relay with both normally
open and closed contacts.
The status will be set if:
• Local or remote fibre link errors exist.
• The unit is out of service, e.g. no power supply.
Designed for hash environments, such as industrial, road and railway
applications
ODW-610-F1 complies with standards for industrial environments and railway
signalling and telecommunications apparatus. Additionally the wide temperature
range ODW-610-F1 permits it to be installed in out-door cabinets without any
additional measures, such as heating, etc.
System delay in an optical network
PROFIBUS DP data transferred from one ODW-610-F1 unit via an optical network to
a second unit will be delayed, due to the length of optical fibre and the signal processing
within the unit. The signal processing delay is dependent on the data rate, and the fibre
delay is dependent on the total length of the optical fibre.
Note tBit = 1 / Baud rate (Baud rate in Bit/s)
Example
During configuration of the PROFIBUS DP master it may be necessary to adjust the
bus parameter Slot time, the monitoring time (t
Bit
) of the sender of the frame for
acknowledgement of recipient. The additional time resulting from the optical fibre and
ODW-610-F1 is twice the overall one-way delay.
Delay @ Up to 1.5 Mbit/s Delay @ 3 /12 Mbit/s
Optical fibre length delay (typical) 5 µs/km 5 µs/km
Signal processing, electrical to fibre (max) 1 t
Bit
+ 1.0 µs 5 t
Bit
+ 1.0 µs
Signal processing, fibre to electrical (max) 0.3 µs 0.3 µs
Overall system delay, one-way. From received
PROFIBUS DP data at one unit until
transmitted data at the other unit 5 µs/km +
1.0 µs + 1 t
Bit
5 µs/km +
1.0 µs + 5 t
Bit
Overall system delay,
one-way
Delay @ 0.5 Mbit/s Delay @ 1.5 Mbit/s Delay @ 12 Mbit/s
200 m fibre length 4.0 µs 2.7 µs 2.4 µs
2000 m fibre length 13.0 µs 11.7 µs 11.4 µs