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Start-Up
6.2
Operating information
NOTICE
NOTE
6.3
Diagnostics
6-4
02.2001
If the SIMOLINK Switch mode is changed while the switch is
transmitting, the incoming signals (converted from optical to electrical)
are switched over to the new outputs. This is performed bit by bit,
resulting in destruction of the telegram structure. The telegrams are
then transmitted via a new signal route through the modified ring
structure (switchover does not take place at telegram limits). Transmit
operation cannot be interrupted or ended in dispatcher mode. For this
reason, the SLS mode is always changed while the switch is
transmitting in dispatcher mode. In order to ensure that all nodes can
reliably detect an interruption in transmit operation and the SIMOLINK
master and dispatcher can execute a proper bus runup, the SIMOLINK
Switch mode must be changed over via OFF mode (mode 0 or 8).
OFF mode must remain selected in dispatcher mode for a period
equaling at least the set telegram failure time of the master before the
new switch mode can be activated. All nodes switch to SIMOLINK error
status during runup at the latest and must be acknowledged.
The bus runup operation is required to allow calculation and
compensation of the dead times in SIMOLINK polling caused by
propagation delays. The signal propagation delay is dependent on the
SIMOLINK ring topology.
The dead time of a signal throughput (optical to electrical back to
optical from any input to any output) in the SIMOLINK Switch is
approximately 273 ns (3 bit times from 11 Mbit/s transmission speed).
Diagnostic LEDs are mounted in the front panel. They indicate the
current SIMOLINK Switch mode, whether it has been activated via DIL
switches or binary inputs or whether no mode is selected. If only
channel 4 is selected via the DIL switches, all LEDs light up for lamp
testing purposes (Table 6-1).
GWE-477 762 4070.76 J
Operating Instructions
SIMOVERT MASTERDRIVES
SIMOLINK Switch
Siemens AG
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