Technical Reference Manual - InduSoft

Tags and the Project Database
• Dev+Limit: Limit deviation to a value higher than the DevSetpoint in a tag value that triggers an alarm.
Define the alarm message in the Tag Properties dialog or on an Alarm worksheet. You can access this field
during runtime.
• Dev+Limit: Limit deviation to a value lower than the DevSetpoint in a tag value that triggers an alarm.
Define the alarm message in the Tag Properties dialog or on an Alarm worksheet. You can access this field
during runtime.
• RateLimit: Limit of rate variation in a tag value that triggers an alarm. Define the alarm message in the
Tag Properties dialog or on an Alarm worksheet. You can access this field during runtime.
Alarms for Integer and Real Type Tags
From the Tag Properties dialog, specify an alarm for integer and real-type tags as follows:
• Alarms Enabled checkbox: Click (check) to enable checking according to configuration.
• Remote Ack tag field: Type a tag to acknowledge this alarm.
• Dead Band Value field: Type a value of the filter for alarms normalization. For example: if the TEMP1 tag
is configured with an alarm with Hi Limit = 90 and Dead Band = 5, then IWS generates an alarm when
TEMP1 ≥ 90. The return to normal occurs when TEMP1 ≤ 85.
• Translation Enabled checkbox: Click (check) to enable the translation of messages defined on the Options tab
in the Project Settings dialog. For additional information about translations, see Translation Tools.
Note: IWS saves Alarm messages with the Translation Enabled attribute enabled in a file called
Alarm.TXT located in your project's \DATABASE\ directory.
• HiHi (HiHiLimit) checkbox: Click (check) to indicate a Very High alarm is present. Accessible during runtime.
• Hi (HiLimit) checkbox: Click (check) to indicate a High alarm is present. Accessible during runtime.
• Lo (LoLimit) checkbox: Click (check) to indicate a Low alarm is present. Accessible during runtime.
• LoLo (LoLoLimit) checkbox: Click (check) to indicate a Very Low alarm is present. Accessible during runtime.
• Rate (RateLimit) checkbox: Click (check) to indicate a Rate alarm is present. Accessible during runtime.
• Deviation+ checkbox: Click (check) to indicate a Deviation alarm is present. Accessible during runtime.
• Deviation- checkbox: Click (check) to indicate a Deviation alarm is present. Accessible during runtime.
• Deviation SetPoint field: Specify a reference point for the deviation. Accessible during runtime.
• Deviation Dead Band field: Specify a reference value for the deviation.
Alarms for Boolean-Type Tags
Use the Alarms-Bool Type tab on the Tag Properties dialog to specify alarm properties for Boolean-type tags.
Alarms-Bool Type Tab
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