Settings For Constantly Monitoring Plc Memory (History Display) - Omron NV Series Programming Manual

Alarm Lists (NV4W/NV3Q)

7-11-4 Settings for Constantly Monitoring PLC Memory (History Display)

Basic Operation
1,2,3...
Note
146
1. Make the Alarm History settings in the NV Configuration.
2. Make the alarm history settings for group 0.
(1) Up to 128 alarms can be monitored. One bit is allocated for each alarm.
When 128 is set, 8 words (8 x 16 bits = 128) are monitored. For example,
when the start address is W30, and the number of alarms has been set
to 32, the 32 bits starting at W30 are monitored, i.e., W30 and W31CH.
(2) Set Bit ON for the alarm status when an alarm is to be displayed when
the bit turns ON. Set Bit OFF for the alarm status when an alarm is to be
displayed when the bit turns OFF.
(3) The number of records is equal to the number of alarms stored in the PT.
A value greater than the number of monitored alarms must be set. Even
if the power to the PT is turned OFF, alarms that have already been stored
are retained by the battery backup. (If the battery is exhausted, the
records will be lost.)
(4) When the Triggered/Recovered Bit turns ON or OFF, press an acknowl-
edge switch and select the data to be added to the records.
Section 7-11
Select NV Configuration from
the PT Menu. Select No. 0 on
the Alarm History Tab Page
and then click the Settings
Button.
To enable monitoring, make the
following settings, and then click
the OK Button.
Name: Enter any
string.
Start Address: W30
Alarm Number (i.e.,
number of alarms): 32
Detection Type: Bit ON
Record
Number of
Records: 100
Record Information: Triggered,
Recovered,
and
Acknowl-
edged
When Memory is
Full: Save New
Data (Use
Ring Buffer)