4-36
Master Communication
MPH-02, MPB-02, MPD-02
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
Ranges of length for the connected fiber optic cable:
•
up to 15 m
•
15 m to 30 m
•
30 m to 45 m
•
more than 45 m and glass fiber
Transmission Rate of the SERCOS interface
The transmission rate is preset by the master, automatically recognized
by the drive, set accordingly and displayed in the
P-0-4087, Baud rate
SERCOS interface
parameter.
Note:
Baud rates of 2, 4, 8 and 16 MBaud are supported.
Using the Distortion Indicator "H20"
After the drive address has been set it is necessary to check whether the
optic signal levels available at every node are sufficient, i.e. whether the
receiver is neither underloaded nor overloaded. The optic signal level is
checked by means of the distortion indicator at the front of the controllers
(LED "H20").
The distortion indicator LED normally stays dark.
To check the optic signal level, the distortion indicators of all drives in the
ring are checked in signal flow direction starting from the transmitter
output of the master (control unit) (see figure in section "Settings of the
SERCOS interface").
Check the distortion indicators in the "direction of the light", i. e. at first,
check the first drive in the ring. If its distortion indicator is dark, go to the
next drive. Do this up to the last drive and then at the master (control
unit).
Note:
The distortion indicator must not be lit nor glow!
The distortion indicator "H20" will be lit in the following cases:
•
fiber optic cable leading to the preceding drive is defective
•
transmission rate is not supported
•
transmission length (transmitting power) is incorrectly set
What to do when the distortion indicator is lit:
Check the fiber optic cable and its connectors from the physical
predecessor in the ring to the affected drive (see below).
Compare the transmission rate of the master to the supported baud rates
of the drive.
At the physical predecessor of the affected drive, check the transmission
length (length of the fiber optic cable at the optical output X20) set in
parameter P-0-4027.
Checking the Fiber Optic Cables
The fiber optic cable may be defective if the preset transmission rate is
supported and the transmission lengths were correctly set, but
communication nevertheless is not established. In this case, the "H20"
distortion indicator will be lit.
The reason for a defective fiber optic cable can be mechanical damage or
bad assembly (connector mounting, ...).
Checking the Optic Signal Level
Check the Fiber Optic Cable
Checking the Transmission Rate
Checking the Transmission
Length
Courtesy
of
CMA/Flodyne/Hydradyne
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Motion
Control
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