Rockwell Automation 2711-ND3 PanelBuilder v2.60 Software User Manual - Manual (Page 247)

15–25 Creating Alarms
Publication 2711-6.0
Using the Remote Ack Tag with Bit Triggered Alarms
This section shows how the controller acknowledges one or all bit
triggered alarms using the Remote Ack tag.
The following setup shows 3 alarms (A,B,C) assigned to the alm_tag
trigger. The Trigger Type is Bit. The contents of the Value/Bit field
is a bit offset from the Trigger Tag address.
One tag handles up to 256 consecutive bits/alarms (0 – 255), for
example, N:15:0/0 to N15:15/15.
In the Tag Editor, alarm tag definitions are:
Tag Name Data Type Tag Address Node Name
alm_tag Bit N15:0/0 SLC_1
ack_tag Unsigned Integer N16:0 SLC_1
rem_ack Bit N15:16/0 SLC_1
When N15:0/2 changes from 0 to 1, Alarm B is triggered. Based on
the contents of the Value/Bit field, this is a 2 bit offset from the
Trigger Tag address (N15:0/0). When the controller writes a 1 to
N15:16/2 (rem_ack tag address), Alarm B is acknowledged.
To acknowledge all alarms for the alm_tag trigger, the controller
must write 1 to the bit position that is one greater than the highest
value in the Value/Bit field. For example, setting N15:0/4 to 1
acknowledges all alarms. If the highest value in the Value/Bit field
is 239 (N15:14/15), setting N15:15/0 to 1 acknowledges all alarms.
If you use the Ack Tag, the controller must acknowledge one alarm
at a time and reset the bit (0) before acknowledging the next alarm. If
you do not use the Ack Tag, the controller can acknowledge more
than one alarm at a time.
The Ack Tag must be a value/word address and returns the value of
the alarm, not the bit pattern. The PanelView will input a value
when you or the controller acknowledges an alarm.