Manual – Controllers DHE/DHF/DHR21B (standard) and DHE/DHF/DHR41B (advanced)
37
4
Installing the DHF21B/41B option
Assembly and Installation Notes
LED L16
(Mod/Net)
The function of LED L16 (Mod/Net = Module/network state) described in the following
table is specified in the DeviceNet specification.
LED L15 (PIO) LED L15 (Polled I/O) monitors the polled I/O connection.
State of the
L16 LED
State Meaning
Off Not switched on/offline • Unit is offline
• Unit performs DUP MAC check
• Unit is switched off
Flashing
green
(1 s cycle)
Online and in operational
mode
• The unit is online and no connection has been
established
• DUP-MAC check performed successfully
• A connection has not yet been established with a
master
• Missing, incorrect or incomplete configuration
Lights up
green
Online, operational mode
and connected
•Online
• Connection to a master has been established
• Connection is active (established state)
Flashing red
(1 s cycle)
Minor error or connection
timeout
• A correctable error has occurred
• Polled I/O and/or bit strobe I/O connections are in
timeout state
• DUP-MAC check has detected an error
Red light Critical error or critical link
failure
• A correctable error has occurred
•BusOff
• DUP-MAC check has detected an error
State of the
L15 LED
State Meaning
Flashing
green
(125 ms
cycle)
DUP-MAC check Unit is performing DUP-MAC check
Off Not switched on/offline but
not DUP-MAC check
• Unit is offline
• Unit is switched off
Flashing
green
(1 s cycle)
Online and in operational
mode
• Unit is online
• DUP-MAC check performed successfully
• A polled IO connection is being established with a
master (configuring state)
• Missing, incorrect or incomplete configuration
Lights up
green
Online, operational mode
and connected
•Online
• A polled I/O connection has been established
(established state)
Flashing red
(1 s cycle)
Minor error or connection
timeout
• Invalid baud rate setting via DIP switches
• A correctable error has occurred
• Polled I/O connection is in timeout state
Red light Critical error or critical link
failure
• An error that cannot be corrected has occurred
•BusOff
• DUP-MAC check has detected an error
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