Omron C200HW-CORT21-V1 Operation Manual page 118

Troubleshooting
I/O data communication problems (continued)
Description
Another Special I/O Unit makes use of the
same data area(s), e.g. C200HW-PRM21, -
DRM21, -PRT21, -DRT21.
When areas overlap, one Unit overwrites the
data area of the other, depending on their
respective Machine Numbers.
The Unit is defective.
Data in the mapped Data that is mapped in the IR- or LR area is
PLC area is being reset when
reset.
•
•
The Unit is defective.
Not all CANopen Other nodes update their SDO data more
PDOs sent by other frequently than the I/O refresh rate of the host
nodes arrive in the PLC. If the same SDO is received twice or
host PLC. more per PLC cycle, only the last data will be
transferred to the PLC.
Other nodes transmit more SDOs linked to the
unit, than can be processed by the unit's CAN
interface. The CAN interface transmits an
Emergency message (receive queue overflow).
Not all CANopen The Unit transmits all data messages, but the
PDOs sent by the processing at the receiving node takes longer
Unit arrive at other than the Unit's I/O refresh cycle
nodes.
The host PLC produces more (changes of state
in) data objects than can be transmitted by the
CAN interface. The CAN interface transmits an
Emergency
overflow).
ERR LED is An application error was detected. IR n+3.14 is
switched ON. set.
Message communication problems
Description
IOWR instruction The IOWR instruction contains syntax errors.
not executed (EQ-flag is not set)
successfully.
The control code is invalid or the specified
message length does not correspond with the
function indicated by the control code.
(EQ-flag is not set).
The contents of the message is invalid.
The Unit is defective.
Possible cause
The Host PLC is switched between
RUN / MONITOR mode and PROGRAM
mode.
A fatal PLC error occurs (see section 6-4)
message (transmit
Possible cause
Possible remedy
Check the mapping of the C200HW-CORT21-
V1 and the other Special I/O Unit. If an
overlap exists, the Unit settings of one of the
units should be changed. Adapt the PLC
program accordingly.
Replace the C200HW-CORT21-V1.
If the Host PLC was not switched to / from
PROGRAM mode, check if a fatal PLC error
has occurred and try to solve the cause of the
error. Refer to the Operation Manual of the
PLC for details.
Replace the C200HW-CORT21-V1.
Reduce the host PLC's cycle time (faster CPU
type, move control tasks and I/O to another
PLC), or
Reduce the update rate of the transmitting
node to match the PLC cycle time.
Reduce the number of output data objects and
RPDOs.
Reduce the update rate of the transmitting
nodes.
Increase the PLC scan time, or only perform
I/O refreshes with the Unit when necessary
(by IOWR command).
Reduce the number of input data objects on
TPDOs.
Increase the PLC scan time
queue
Restart the Unit. If this does not help, replace
the Unit.
Possible remedy
Check if the correct Machine number and
message length is specified in the IOWR
instruction.
Read the error log to find the cause.
Check if the control code lies within the range
#0001 to #0004.
Check the message length.
Check the contents of the message.
Replace the C200HW-CORT21-V1.
Section 7-2
101