Omron CP1L CPU UNIT - 06-2007 Operation Manual page 495

DeviceNet I/O Link Units
Handling Unit Errors
462
Note When using Expansion Unit/Expansion I/O Unit Error Flags (A436)
in the program, set pin 4 on the DIP switch to ON. If communica-
tions are set to be cleared, the timing for clearing outputs and set-
ting the Error Flags may not agree.
(4) LED Indicators
Used to indicate CPM1A-DRT21 status, as shown in the following table.
Indicator Color Status
MS Green Lit
Flashing
Red Lit
Flashing
--- OFF
NS Green Lit
Flashing
Red Lit
Flashing
--- OFF
(5) Expansion I/O Connecting Cable
Connected to the expansion connector of a CP1L CPU Unit or an Expan-
sion Unit or Expansion I/O Unit. The cable is included with the DeviceNet
Unit and cannot be removed.
Note Do not touch the cables during operation. Static electricity may
cause operating errors.
(6) Expansion Connector
Used for connecting Expansion Units or Expansion I/O Units.
If a communications error occurs while the slave is on standby, the appropri-
ate bit in word A436 will turn ON. The appropriate bit is determined by the
order in which the Expansion Units and Expansion I/O Units are connected.
The Unit nearest to the CPU Unit uses A436.00. Use these flags in the pro-
gram when it is necessary to detect errors.
Condition
Normal status • Normal status
Not set • Switch settings being read
Fatal error • Fatal hardware error
(watchdog timer)
Nonfatal error • Incorrect switch settings.
Power not supplied. • Power not supplied.
• Waiting for initialization to
start.
• Reset in progress.
Online and commu- • Network normal and com-
nications estab- munications established.
lished.
Online and commu- • Network normal and com-
nications not estab- munications not estab-
lished. lished.
Fatal communica- Unit has detected network
tions error status preventing normal
communications.
• Node number duplications
• Bus OFF detected.
Nonfatal communi- • Communications timeout
cations error or communications error
for one or more slaves.
Online and power Waiting for node number
OFF. check by master.
• Switch setting error.
• Power not supplied.
Section 7-7
Meaning