Westermo LD-64F User Manual

Redundant linjedelare

Optisk fiber – RS-422/485

Redundant line splitter

Fibre-optic – RS-422/485

Redundanter Glasfaser Leitungsteiler

– RS-422/485

INSTALLATIONSANVISNING

INSTALLATION MANUAL

INSTALLATIONS ANLEITUNG

6073-2011

www.westermo.se

LD-64F

©

Westermo Teleindustri AB • 2001 • REV. C

Galvanic
Isolation

Transient

Protection

Balanced

Transmission

CE

Approved

12 6073-2001

LEDs for indication on LD-64F

• PWR: Indicates that the converter has power.

• TD: Indicates that the converter is receiving data on RS-422/485 side.

• RD: Indicates that the converter is sending data on RS-422/485 side.

• Rx1: Indicates received data on fiber channel 1.

• Rx2: Indicates received data on fiber channel 2.

• Tx1: Indicates that the converter is sending data on fiber channel 1 from RS-422/485 side.

• Tx2: Indicates that the converter is sending data on fiber channel 2 from RS-422/485 side.

Specifications LD-64F

Transmission Asynchronous*, full/half duplex or simplex
Interface 1 EIA RS-422/RS-485/ITU-T V.11

5-position screw block

Interface 2 4 ST-connectors, see table of power budget
Data rate 500 kbit/s – 1.5 Mbit/s
Indicators Power, TD, RD, TX1, TX2, RX1, RX2
Temperature range 5–50°C, ambient temperature
Humidity 0–95% RH without condensation
Dimension 55x100x128 mm (WxHxD)
Weight 0.6 kg AC / 0.3 kg DC
Mounting On 35 mm DIN-rail
Power supply alternatives

Model description

LD-64F LD-64F LD-64F LD-64F LD-64F
AC 115V AC DC 36–55V DC 110V DC

Power supply 230 V AC 115 V AC 24 V DC 48 V DC 110 V DC/80 V AC

+15/–10% +15/–10% +50/–50% +15/–25% +10/–10%
Frequency 48–62 Hz 48–62 Hz – – –/48–62 Hz
Fuse, F2 100 mA S 100 mA S 1.6 A S 1.6 A S 1 A T/1 A T

5x20 mm 5x20 mm 5x20 mm 5x20 mm –/–

Littelfuse Littelfuse Littelfuse Littelfuse Wickmann
Power consumption 25 mA 50 mA 3 W 3 W 30 mA
Transient protection

Power/Line Yes/– Yes/– –/– –/– Yes/–

Isolation RMS

Power supply 3 000 V 3 000 V 1 500 V 1 500 V 3 000 V

* Synchronous protocols can be transmitted under certain circumstances.

See ”selection of bits” page 17.

136073-2001

Description LD-64F

LD-64F offers redundant fibre optic communication on RS-422/485 in a multi-drop
network. LD-64F is a high-speed version of LD-64 and data rates from 500 kbit/s
up to 1.5 Mbit/s is possible.

Both multi mode and single mode fibre versions are available. All fibre optic connections
are of the ST-type. Plastic fibre can be used for very short distances (<20 meters).
The maximum transmission distance is calculated from the available power budget of
the modems and the attenuation of the cable, splice joints and connectors. Distances
up to 25 km can be reached using single mode fibres.

The LD-64F is arranged in a master slave configuration with the fibre both starting and
finishing at the master unit. Only one master can be configured on a loop at any time.
There are two F/O channels on each unit, each with a separate transmitter and receiver.
The front cover has 7 LED’s to indicate the state of the various communication paths.

The LD-64F is equipped with a redundant logic system which will control the flow of the
data during fault conditions. If a break is detected on a fibre or a pair of fibres the data
will be re-routed through channel 2. This operation will take approximately 4 ms.
All data in this 4 ms will be lost and will need to be resent.

As with all other Westermo products the LD-64F provides a high level of galvanic
isolation on the power supply side through transformers and also on the alarm side
through optocouplers.

All the operating parameters are set-up via DIP switches located under the lid on the
top of the unit.

Indication and alarm outputs are provided at the master and at the slaves either side of
the fault. the indication and alarm outputs will continue to operate as long as the fault
persists.

The LD-64F is available in a variety of supply voltage in both AC and DC.

14 6073-2011

Description of redundancy

LD-64F is connected through two parallel fibre optical rings, ring 1 and ring 2. The ring
topology introduces the possibility for the units to handle a fault on a fibre or a fibre pair
and still maintain communication. The units will automatically change the communication
path when a fault is detected. This change can take up to 4ms and all data sent during
this time needs to be resent since the modems do not have any possibility to databuffer.

One modem in the ring needs to be configured as master through switches inside the
unit. The master controls the data and prevents data to be resent through the ring. The
master is also used for monitoring of the fibre rings since all faults detected in the rings
will be sent to the master. This gives possibility to monitor the complete system through
the master unit. The other modems in the ring needs to be configured as slaves and will
be transparent during normal communication.

LD-64F is equipped with alarm signals which is used for indication of fibre interruptions.
Each unit is equipped with two alarm ports, one for each fibre channel. These ports are
marked as CE1 and CE2 on the unit. A fault will close the circuit between indications
“C” and “E” on respective port. The alarm outputs can for example be used for
connection of an external relay. See connections and examples on page 19–20.

An interruption will be detected by the closest unit which will indicate a receiver alarm
and also send the error further to the master unit which will indicate a corresponding
fault for the ring.

For correct function the fibre optic rings needs to be connected correct between
each modem

Ring 1: Tx1 – Rx2 – Tx1 – Rx2 etc.
Ring 2: Tx2 – Rx1 – Tx2 – Rx1 etc.