Schweitzer Engineering SEL-2032, Instruction Manual

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4.6
SEL-2032 Communications Processor Instruction Manual Date Code 20120126
SEL
OGIC
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
(ISSUE x setting), it sets the corresponding D x or ARCH x element. Once the
message has been issued and any corresponding data collection is completed,
the D
x or ARCH x is cleared. If a rising edge of a trigger condition is detected
but the corresponding D x or ARCH x element is already set, then the
corresponding DLY x or DLYA x bit is set to indicate that an auto-message
operation has been missed. You can clear DLY x and DLYA x 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 DLY
x 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
Courtesy of NationalSwitchgear.com