Siemens SIMOVERT MASTERDRIVES Manual page 439

05.2006
NOTE
NOTE
Siemens AG 6SE7087-6QX70 (Version AG)
SIMOVERT MASTERDRIVES
♦ P742:
SLB transmit power (dispatcher and transceiver)
The power of the fiber-optic transmit block for every node can be set
by a parameter.
The transmit power can be set in the stages 3 = 40 m, 2 = 25 m and
1 = 15 m cable length. This scaling means, for example, that in
stage "2" a transmit power is set for bridging a distance of up to 25
m plastic fiber-optic cable.
• Localization of fault sources in the medium upon start-up:
Hidden fault sources on the transfer medium which may not be
possible to detect with full power strength can be better localized
by reducing the transmit power. Possible causes of the faults
may, for example, be that the bending radii are too small or that
the contacts of the fiber-optic cable fibers in the connector are
poor.
• Ageing of the fiber-optic cable components:
By reducing the transmit power, the ageing process of the fiber-
optic cable components can be slowed down.
♦ P743:
Number of nodes (dispatcher and transceivers)
With this function, each node can compensate for its individual time
delay t for compensation of runtime delays caused by the
delay
signal conversion in each node.
Formula for transceivers at the n-th position in the ring:
t = [number of nodes - n ] x 3 bit times;
delay,n
The "Number of nodes" value is specified to the nodes as a
parameter.
The position n at which the node is situated in the ring is calculated
automatically in the SIMOLINK starting cycle.
The SL master or dispatcher sends a special telegram with the
address 253 "Count nodes" and the starting value 1. Each
transceiver which receives this telegram remembers this number (=
Count number) and then increments the data contents by the value
1. In this way, the node has the count number 1 directly after the SL
master or dispatcher while the SL master or dispatcher has the
maximum count number, which also corresponds to the number of
node. The result of this procedure can be checked in parameters
r748 Index 7 (position of the node in the ring) and r748 Index 8
(number of nodes in the ring).
The formula stated above neglects the throughput delay of the
SIMOLINK switch. Generally, this is permissible as the switch, for
example, is usually situated at the beginning of the ring and thus does
not cause any delay between transceivers.
The transceiver n waits t
the unit application after receipt of the SYNC telegram. This ensures
that the interrupts to the unit applications of all nodes are effected as
synchronously as possible.
Compendium Motion Control
Communication / SIMOLINK
before it can give an HW interrupt to
delay,n
8.3-11