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System Tools
13.24 Alarm Scan
Alarm Messages are displayed on Alarm Display and Alarm Bar parts. The message to be displayed must first be
registered in the Alarm Scan list. A bit controls each message. If the bit activates the alarm (either ON or OFF), the
corresponding message is displayed.
Procedure to add/modify alarm messages
1. Click Alarm Scan icon or select
Alarm Scan
from the
Parts
menu.
The Alarm Scan Object message summary
screen is displayed.
2. Click on the
Add
button to add a new
message or click on the
Setting ….
button to
edit an existing message. If you click on the
Delete
button, the current highlighted function
is deleted
3. When adding or editing messages fill in the
Attributes Dialog:
Read Address
: specifies the PLC bit address that
triggers the message.
Device type
is the bit prefix.
Device address
is the bit number
Tag
is used to select the Read address from a
list of predefined Tags.
Aux.
directs the Read address to be retrieved
from the Auxiliary Port.
Attribute
:
Alarm
ON
: displays this message when the bit is ON.
OFF
: displays this message when the bit is OFF.
Category
– alarm category (reserved for future
use)
Text
: Enter the message
Content
text, text
Color
and
Font
size.
Note
:
Size 24 font requires Alarm Display and Alarm Bar parts to have a minimum of two lines to be displayed
properly.
4. Click
OK
, the message appears in Alarm Scan message summary box.
Note:
Normally up to 200 alarm and event messages can be programmed into the Alarm Scan and Event Log objects. If
more than 200 messages are needed, go to the
System Parameters
,
General Tab
,
Extra No. of Event:
and enter
the
additional amount. For example, if 1200 messages are needed, enter 1000. Up to 2800 extra events can be added. See
Software Reference section, System Parameters for more information about this topic.
Alarm Scan Design Tip:
In order to take full use of communication bandwidth, it is recommended that a block of continuous
PLC bit devices be used for the Alarm Scan list. For example: Use Bits 100 to 199 to control the display of all alarm
messages. In this case, one read command retrieves Bits 100 to 199 all at once instead of one bit at a time.
Summary of Contents for MMI-1500
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