Chapter 2 System Operation 19
The headings were abbreviated because of space limitations, and the full names are
Source, Condition, Action, and Target. In addition, the condition and action values
were also abbreviated. See the tables below for the full text of each abbreviation:
Laser Conditions
TEC Conditions
Abbrev
Full Text
Abbrev
Full Text
On
On
On
On
Off
Off
Off
Off
Out
Out of tolerance
Out
Out of tolerance
In
In tolerance
In
In tolerance
IoL
Current limit
I L
Current limit
VfL
Voltage
compliance limit
V L
Voltage limit
ImL
Photodiode
current limit
T L
Temperature limit
PoL
Photodiode power
limit
ThL
Temperature high limit
Lck
Interlock open
TlL
Temperature low limit
Opn
Open circuit
R L
R limit
Sho
Short circuit
Opn
Module or sensor open
Actions
Abbrev
Full Text
Off
Turn off
f#
Turn off in # seconds
On
Turn on
n#
Turn on in # seconds
The
CLR
soft key allows clearing of all defined links. To clear a single link, simply
change the source field to
No
. The system supports up to 24 links.
Each condition is evaluated approximately once per second. Links are edge triggered,
which means that the action of a link is done the first time the condition goes true, not
whenever the condition is true. The action will not be done a second time until the
condition first goes false and then returns to true.
As an example of linking, consider a system where the TEC module cannot operate
when the laser is off because condensation will form on the laser and may damage it.
However, the TEC must be turned on whenever the laser is on to protect it from
overheating. First, program the TEC high and low temperature limits to the operating
range of the laser. The following three links will then ensure these conditions are
met:
#
Source Condition Action Target
A 1 On Turn On 2
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