Knurr RMS compact, Руководство пользователя, Страница: 21 / 64

RMS compact
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9. Exit Contact Input Type Setup
Enter choice (ESC to exit):
Figure 25 Contact Closure Type
In the above example, all contacts are set to LEVEL – selecting one of the inputs will display the following
options:
Enter choice (ESC to exit): 1
Enter new Input Type 0=LEVEL,1=POSEDGE,2=NEGEDGE :
Figure 26 Contact Closure Type choices
These three types have the following meanings:
LEVEL: This option monitors the input in ‘real time’ and will reflect any changes in state that take
place. This means that if the input is switched on momentarily, then switched off, - both
changes of state will be registered by the RMS Compact. So, for example, if the RMS
compacthas been configured to send a trap for ‘alarm on’ and ‘alarm off’, the NMS will see
these traps in real time.
The following example (a normally closed contact - e.g. a door) should help to illustrate this:
Figure 27 : LEVEL Contact Closure monitoring
The following options are used when the user wishes to ‘latch’ an alarm signal. I.e. if an alarm occurs
momentarily, but the user wishes the alarm to remain present until manually reset by the user:
POSEDGE: Primarily used when monitoring Normally Closed (NC) contacts, the alarm will be triggered
when the contact closure goes from a closed state (negative edge signal) to an open state
(positive edge signal). Once the alarm has been set, it will need to be manually reset by the
user (using either an SNMP set or using the ‘Reset’ button on the Viewer Programmer
application – this will be explained in more detail later.
The following diagram should help to explain this:
Figure 28 Positive Edge (POSEDGE) Monitoring
Signal state
for a normally
closed digital
input
+
Alarm Condition
(contact opens)
-
Return to Normal
(contact closes)
Alarm condition
still present,
until manually
reset by the
user
Signal state
for a normally
closed digital
input
+
Alarm Condition
(contact opens)
-
Return to Normal (contact
closes) and alarm condition
clears