Yaskawa SmartTrac DeviceNet Card - Manual (Page 28)

SMART TRAC DeviceNet Card
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Troubleshooting Your Smart Trac DeviceNet Card Technical Manual 3554-0070
Status and Error Message Global Variables
Global Variable (format
is _Variable
Type Source Action
_CAN_BP BOOL CAN Bus
Status
Word, Bit
9 (BP) Indicates presence or absence of
network power. BP bit is clear if the
physical bus interface is not powered.
_CAN_BW BOOL CAN Bus
Status
Word, Bit
1 (BW Set when abnormal number of
communication errors detected and
CAN chip stops transmitting error
frames.
Cleared when error count returns to
normal levels or CAN interface re-
initialized.
BW indicates potentially serious
communication fault such as out-of-
tolerance baud rate or physical layer
error (electrical noise, signal
attenuation, intermittent connections
etc.).
_CAN_ER BOOL CAN Bus
Status
Word, Bit
8 (ER). Set each time a CAN communication
error is detected. An excessive
number of errors indicates a faulty
physical media component (cable,
connector etc.) or excessive noise
from external sources (check cable
routing and shield connection).
_CAN_ERROR WORD CAN
error
counter
at offset
0038h The CAN communication error counter
is incremented when a CAN frame
error is detected
_CAN_LOST WORD CAN
LOST
counter
at offset
003Ah. The CAN lost messages counter is
incremented when a CAN message is
received before the previous message
is placed into the receive queue.
_CAN_ML BOOL CAN Bus
Status
Word, Bit
7 (ML) ML is set when a message is received
from the bus while the previous
message is still in the receive buffer.
ML indicates a lower layer application
error (in the kernel interrupt handler).
Report this condition to your
MagneTek Application Engineer.
_CAN_O1 BOOL CAN Bus
Status
Word, Bit
12 (O1) O1 is set when the scanner is online at
125 Kbaud.
_CAN_O2 BOOL CAN Bus
Status
Word, Bit
13 (O2) O2 is set when the scanner is online at
250 Kbaud
_CAN_O5 BOOL CAN Bus
Status
Word, Bit
14 (O5). O5 is set when the scanner is online at
500 Kbaud.