Manual 02007
DSLC Digital Synchronizer and Load Control
Woodward
39
5.
Transmit Errors
is the number of CRC (Cyclic Redundancy Check) errors
detected during packet reception. These may be due to collisions or noise
on the transceiver input. Pressing the “.” key will retrieve the current number
of transmission error statistics.
6.
Transaction Timeouts
is the number of times that the node failed to
receive expected acknowledgements after retrying the configured number of
times. These may be due to destination nodes being inaccessible on the
network, transmission failures because of noise on the channel, or if any
destination node has insufficient buffers or receive transaction records.
When using Request/Response service or network variable polling, a
transaction timeout can also occur if the destination node application
program does not return to the scheduler frequently enough because
responses are synchronized with the application tasks.
7.
Rcv Transaction Full
is the number of times than an incoming packet was
discarded because there was no room in the transaction database. These
may be due to excessively long receive timers, or inadequate size of the
transaction database.
8.
Lost Messages
is the number of times than an incoming packet was
discarded because no application buffer was available. These may be due
to an application program being too slow to process incoming packets, due
to insufficient application buffers, or due to excess traffic on the channel.
Messages will be lost when power is initially applied to a DSLC control while
power up diagnostics are being performed (the number will depend on the
number of DSLC controls in the system).
9.
Missed Messages
is the number of times that an incoming packet was
discarded because there was no network buffer available. These may be
due to excess traffic on the channel, to insufficient network buffers, or to the
network buffers not being large enough to accept all packets on the
channel, whether or not addressed to this node.
10.
Last Reset Cause
is the cause of the last reset of the network processor.
11.
Network State
indicates the current state of the network processor. The
normal node state is “Configured, On-line”. Other states can occur during
installation of the control using network management tools.
12.
Network Error Log
is the last run-timer error logged.
13.
Net Interface Errors
is the number of errors detected by the DSLC
processor software during communicating with the network processor.
Errors can occur during custom installation of the control with network
management tools. Occasional errors will not effect control operation.
Frequent errors indicate a defective control.
14.
A/D Errors
is the number of errors detected by the DSLC software during
communication with the A/D (analog-to-digital) converter. Occasional errors
will not effect control operation. Frequent errors may be caused by
excessive electrical noise or extreme voltage transients on the wiring, or by
a defective control.