Siemens SIMADYN D Hardware Manual page 287

Aotewell Ltd
Errors when
establishing the
link
Hardware - SIMADYN D
Edition 03.2001
HongKong|UK|China
www.aotewell.com
If all of the initialization data have been completely loaded into the OP2, OP2
automatically goes into the process data display mode (refer to the Chapter
"Process data processing").
OP2 remains in the particular initialization step until it has been completed.
Depending on the particular configured software, it can take up to a minute
to establish the communications link. This link can only be established after
the SIMADYN D subrack has run-up.
If an attempt is made to select operating modes, process data- or binary
value display while the link is being established, OP2 ignores this attempt.
However, received message telegrams are processed.
If errors occur when establishing a communications link, an appropriate
system message is generated and the LED in the key SYSMSG starts to
flash. The message can then be read-out by depressing the SYSMSG key.
OP2 waits until the error has been rectified.
The following errors can occur:
• No activity on the USS bus (S24 system message). This message is
set once when OP2 runs-up, and disappears as soon as the first
telegram is transferred along the bus.
− SIMADYN D subracks are not powered-up or are running-up.
− BUS coupling is not available or faulted, cable not inserted.
− baud rate incorrectly set.
• No SCAN telegram with node number (station number) of the OP2
after the protocol monitoring time has expired (system message
S25).
− the incorrect BUS address is set in OP2
− SIMADYN D configuring incorrect.
• Transfer error (system message S4). The message only appears until
the correct telegram has been received.
− line fault, incorrect baud rate.
• Erroneous INIT data The received data are logically erroneous.
− cable fault, incorrect baud rate.
− check the configured software.
The errors must be rectified. The OP2 can then be re-initialized, initiated via
the system mode.
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