Creating Alarms - Omron NA Series Practices Manual

４-１０ Creating Alarms
４-１０-１ Alarm Mechanism
Just as the conventional PTs, the NA has the function to manage alarms that give the users
the warnings of errors and problems occurred in the machines. The NA's alarm mechanism
is prepared to combine the following two schems depending on the environment where the
system is established.
(1) Managing the alarm list/log on the NA side (HMI alarms)
In the "HMI Alarms" scheme, the PT has the alarm processing function. Therefore,
alarm management by the controller is simple. This scheme is often selected when
multi-vendor support of controllers is required.
HMI Alarm
Function
Alarm
Variables
Error
Detection
Program
(2) Managing the alarm list/log on the NJ side (Troubleshooter)
In the "Troubleshooter" scheme, the controller has the event processing function,
and the PT only displays the events. This makes the entire management including
the PT simple, and allows the users to reduce design man-hours. Therefore, this
scheme is used for the system in which the configuration of NJ and NA is fixed.
Troubleshooter
Event Function
Error
Detection
Program
Even though controllers are changed by the user's
specification, it does not matter if the alarm variables
interface for the controllers remain the same.
An error detection program should be added.
PLC of
Another
Error Error
Company
Detection Detection
Program Program
ＨＭＩ Alarm
Function
Alarm
Variables
PLC of Another
Company
Error Detection
Program
PLC of
Another
Error
Company
Detection
Program
When the controller is changed,
all the HMI alarm functions need
to be remade.
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