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DeviceNet I/O Link Units Section 7-7
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.
(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.
Handling Unit Errors 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.
Indicator Color Status Condition Meaning
MS Green Lit Normal status • Normal status
Flashing Not set • Switch settings being read
Red Lit Fatal error • Fatal hardware error
(watchdog timer)
Flashing Nonfatal error • Incorrect switch settings.
--- OFF Power not supplied. • Power not supplied.
• Waiting for initialization to
start.
• Reset in progress.
NS Green Lit Online and commu-
nications estab-
lished.
• Network normal and com-
munications established.
Flashing Online and commu-
nications not estab-
lished.
• Network normal and com-
munications not estab-
lished.
Red Lit Fatal communica-
tions error
Unit has detected network
status preventing normal
communications.
• Node number duplications
• Bus OFF detected.
Flashing Nonfatal communi-
cations error
• Communications timeout
or communications error
for one or more slaves.
--- OFF Online and power
OFF.
Waiting for node number
check by master.
• Switch setting error.
• Power not supplied.
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