Omron SYSMAC LINK C1000H-SLK21-V1 System Manual page 140

Network Troubleshooting
Node cannot join data link
LNK indicator is not lit and
126
• Check whether the Unit is mounted in a permissible slot on the Rack.
• Check whether the Unit operates normally when mounted on another PC.
• If none of the actions above solve the problem, replace suspect SYSMAC
LINK Units.
ERC indicator lit
• Check the PC's Communications Controller Error Flags. If ON, replace the
SYSMAC LINK Unit.
• Check whether node number is within the range of 1 to 62. If not, reset to a
unique node number from 1 to 62 (duplicate node numbers not permitted).
• Check for duplicate node numbers. Make sure each node number is assigned
to only one unit.
ERH indicator lit
• Check whether the Unit is mounted to an incompatible model or version or PC.
Replace PC if necessary.
• Check for CPU Unit error in the PC. Switch power off and turn on again. If prob-
lem occurs again, replace PC.
• Check for EEPROM error.
INS indicator not lit
• Check whether local node number is greater than the maximum node number
setting. If it is, lower local node number or increase maximum node number.
• Check whether the same node number has been assigned twice.
• In coaxial cable systems, check whether the Terminators are connected prop-
erly.
• Check whether all cables are connected properly.
• Check whether the cables transmit properly.
Node cannot be entered into the data link. Check indicators on the node
which you want to add to data link.
RUN indicator not lit
• Check whether power is being supplied to the PC at adequate voltage.
• Check whether mounting screws on Unit are tight.
• Check whether the Unit is mounted in a permissible slot on the Rack.
• Check whether the Unit operates normally when mounted on another PC.
• If none of the actions above solve the problem, replace suspect SYSMAC
LINK Units.
ERC indicator lit
• Check the PC's Communications Controller Error Flags. If ON, replace the
SYSMAC LINK Unit.
• Check whether node number is within the range of 1 to 62. If not, reset to a
unique node number from 1 to 62 (duplicate node numbers not permitted).
• Check for duplicate node numbers. Make sure each node number is assigned
to only one unit.
ERH indicator lit
• Check whether the Unit is mounted to an incompatible model or version or PC.
Replace PC if necessary.
• Check for CPU Unit error in the PC. Switch power off and turn on again. If prob-
lem occurs again, replace PC.
• Check for EEPROM error.
Section 8-2