29
Common Slave Specifications
Section 3-1
3-1-2
MS and NS Indicators
This section describes the meaning of MS and NS indicators for the Slave
Units. The MS (Module Status) indicator displays the status of a node on the
network. The NS (Network Status) indicator displays the status of the entire
network. The MS and NS indicators can be green or red and they can be OFF,
flashing, or ON. The following table shows the meaning of these indicator
conditions.
The following diagram shows the indicator panel on a basic Slave Unit. The
position and status of the indicators, may change depending on the specific
Slave Unit.
Indica-
tor
Color
Status
Definition
Meaning
MS
Green
ON
Device
Operational
Normal operating status.
Flashing
Device in
Standby
Reading switch settings.
Red
ON
Unrecover-
able Fault
Unit hardware error: Watchdog timer
error.
Flashing
Minor Fault
Switch settings incorrect, etc.
---
OFF
No Power
Power isn’t being supplied, waiting for ini-
tial processing to start, or the Unit is
being reset.
NS
Green
ON
Link OK.
On-line,
Connected.
Network is operating normally (communi-
cations established)
Flashing
On-line, Not
Connected
Network is operating normally, but com-
munications have not yet been estab-
lished.
Red
ON
Critical Link
Failure
A fatal communications error has
occurred. Network communications are
not possible. Check for a node address
duplication or Bus Off error.
Flashing
Connection
Time-out
Communications timeout.
---
OFF
Not Pow-
ered/
Not On-Line
Checking for node address duplication
on the Master, switch settings are incor-
rect, or the power supply is OFF.
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