Rockwell Automation 1336T ControlNet Frn1.02 Rev 1.5 - Manual (Page 204)

8–2 Using the Trend Features
Publication 1336 FORCE–5.18 ––March, 1999
The trigger condition defines the event that must be true before the
trend is triggered (activated). After the trend is activated and the
required number of post samples have been recorded, the last 500
samples for that trend are made accessible via the output parameter.
The following statement determines the trigger point:
[Variable X] [Operator] [Variable Y]
Variable X is compared to Variable Y. If the condition specified by
the Operator is true, then the trend is triggered. Typically, you link
one variable to a parameter and the other variable to either a
parameter or a constant value.
Important: You should make sure that you are comparing either
both signed parameters, or both unsigned parameters. Trying to
compare a signed parameter to an unsigned parameter could cause
unexpected results.
To set the trigger condition:
1. Identify the parameter number of the parameter whose value you
want to be variable X.
2.
If you have identified a
parameter number for
variable X and are
programming Trend:
Then enter the number of the
parameter to be sampled in:
1 Parameter 455
2 Parameter 465
3 Parameter 475
4 Parameter 485
3. Identify the parameter of the parameter you want to be
Variable Y.
4.
If you have identified a
parameter number for
variable Y and are
programming Trend:
Then enter the number of the
parameter to be sampled in:
1 Parameter 456
2 Parameter 466
3 Parameter 476
4 Parameter 486
Setting the Trigger
Condition
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