Specifications

Ethernet Head Station STL-ETH1 (Ethernet)
4 - 4
MITSUBISHI ELECTRIC
4.2.3 Display Elements
The health of the Ethernet fieldbus is signalled through the top LED group (LINK ACT 1, LINK ACT 2, MS,
and NS).
The two-colored LEDs "MS" (module status) and "NS" (network status) are solely used by the Ethernet/
IP protocol. These two LEDs conform to the Ethernet/IP specifications.
* The blinking of the I/O LED indicates an error message comprised of an error code and error argument. Please refer to the
manual of the STL-ETH1 for a detailed description of the blink codes.
Fig. 4-4: The operating condition of the head
station is signalled via LEDs.
Group LED Color Status Description
Fieldbus
status
LINK ACT 1 Green
ON The fieldbus node is connected to the physical network via port 1.
Flashing The fieldbus node sends and receives Ethernet telegrams via port 1.
OFF The fieldbus node is not connected to the physical network.
LINK ACT 2 Green
ON The fieldbus node is connected to the physical network via port 2.
Flashing The fieldbus node sends and receives Ethernet telegrams via port 2.
OFF The fieldbus node is not connected to the physical network.
MS
Green
ON Normal operation
Flashing The system is not yet configured.
Red ON The system indicates a not remediable error.
Red/green Flashing Self test
— OFF No system supply voltage
NS
Green
ON
At least one connection (MODBUS/TCP or Ethernet/IP) is estab-
lished (also connection to the Message router applies).
Flashing No connection (MODBUS/TCP or Ethernet/IP).
Red
ON The system indicates a double IP address in the network.
Flashing
At least one connection (MODBUS/TCP or Ethernet/IP) announced a
Time-out, where the controller functions as target.
Red/green Flashing Self test
— OFF No IP address is assigned to the system.
Node status I/O
Green ON The fieldbus node is operating correctly.
Orange Flashing
The internal data bus is initialized, 1-2 seconds of rapid flashing
indicate start-up.
Red
ON Controller hardware defect
Flashing General internal bus error*
Cyclical
flashing
Up to three successive blinking sequences indicate internal data
bus errors. There are short intervals between the sequences.
—OFF
No data cycle on the internal bus. (The head station/controller sup-
ply is off.)
Tab. 4-1: Description of the LEDs of the STL-ETH1