Schweitzer Engineering SEL-2032 - Figure 4.3 Message Triggering Logic; Figure 4.4 Normal Auto-Message Trigger

4.6
SEL-2032 Communications Processor Instruction Manual Date Code 20120126
SELOGIC Control Equations
Outputs
Message Triggers
On all used ports, you can set the port to send a message based on a trigger
condition. These trigger conditions, which are defined using SEL
OGIC control
equations, are processed every 15.6 milliseconds.
Whenever the SEL-2032 detects a rising edge ( ) of a trigger condition
(ISSUEx setting), it sets the corresponding Dx or ARCHx element. Once the
message has been issued and any corresponding data collection is completed,
the Dx or ARCHx is cleared. If a rising edge of a trigger condition is detected
but the corresponding Dx or ARCHx element is already set, then the
corresponding DLYx or DLYAx bit is set to indicate that an auto-message
operation has been missed. You can clear DLYx and DLYAx bits by executing
a STATUS command. Figure 4.3 illustrates this logic.
Figure 4.3 Message Triggering Logic
A typical trigger sequence starts with a trigger condition being satisfied. For
example, consider the SEL
OGIC control equation ISSUE1 = P00:00:10.0. This
trigger condition will have a rising edge every 10 seconds. Figure 4.4
illustrates the relative timing of this issue condition and its corresponding
message element (D1).
Figure 4.4 Normal Auto-Message Trigger
If the auto-message is not completely processed before the next trigger occurs
(for this example, longer than 10 seconds), then the DLYx bit is set, as shown
in Figure 4.5.
ISSUEx
Rising-Edge
Operation
Completion
STATUS
Command
SET
RESET
Q
SET
DLYx or
DLYAx
Dx or
ARCHx
RESET
Q
Auto-Message
Operation
Completes
Auto-Message
Is Triggered
ISSUE1
D1
Rising Edge Rising Edge
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