LED Descriptions
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PC Cards cifX Compact PCI, Mini PCI, Mini PCIe, PCI-104 | Installation, Operation and Hardware Description
DOC120205UM53EN | Revision 53 | English | 2019-03 | Released | Public
© Hilscher, 2008-2019
8.11 Open Modbus/TCP
For the OpenModbusTCP protocol, the communication LEDs
RUN
and
ERR
as well as the Ethernet LEDs
LINK
and
ACT
can assume the states
described below. This description is valid from stack version V2.5.
LED
Color
State
Meaning
Duo-LED red/green
(green)
On
Connected
: OMB task has communication. At least one TCP connection is
established.
(green)
Flashing
(1 Hz)
Ready, not yet configured:
OMB task is ready and not yet configured.
(green)
Flashing
(5 Hz)
Waiting for Communication:
OMB task is configured.
RUN
General
name:
COM 0
(off)
Off
Not Ready
: OMB task is not ready.
Duo-LED red/green
(off)
Off
No communication error
(red)
Flashing
(2 Hz,
25% on
)
System error
ERR
General
name:
COM 1
(red)
On Communication error active
LED green
(green)
On
The device is linked to the Ethernet.
LINK
Ch0 & Ch1
(off)
Off
The device has no link to the Ethernet.
LED yellow
(yellow)
Flicker-
ing (load
depen-
dant)
The device sends/receives Ethernet frames.
ACT
Ch0 & Ch1
(off)
Off
The device does not send/receive Ethernet frames.
Table 64: LED states for the OpenModbusTCP protocol
LED state
Definition
Flashing (1 Hz)
The indicator turns on and off with a frequency of 1 Hz:
“on” for 500 ms, followed by “off” for 500 ms.
Flashing (2 Hz,
25% on
)
The indicator turns on and off with a frequency of 2 Hz:
“on” for 125 ms, followed by “off” for 375 ms.
Flashing (5 Hz)
The indicator turns on and off with a frequency of 5 Hz:
“on” for 100 ms, followed by “off” for 100 ms.
Flickering (load
dependant)
The indicator turns on and off with a frequency of approximately 10 Hz to indicate high Ethernet
activity: on for approximately 50 ms, followed by off for 50 ms. The indicator turns on and off in
irregular intervals to indicate low Ethernet activity.
Table 65: LED state definitions for the OpenModbusTCP protocol
