The following sections detail the effects on the history of reloaded Alarm, Trend and Report records. This is dependent on which fields have changed.
A ‘Yes’ in the New Alarm column indicates changes to that field will make a new alarm and delete the old one and therefore the history is not kept.
A ‘Yes’ in the Invalid History column means changes to that field will make the history of that record invalid.
Alarm Servers
Common Alarm fields
| Field Name | New Alarm | Invalid History |
|---|---|---|
| Alarm Tag | Yes | No |
| Cluster Name | Yes | No |
| Alarm Description | No | No |
| Alarm Category | No | No |
| Help | No | No |
| Delay | No | No |
| Comment | No | No |
| Privilege | No | No |
| Area | No | No |
| Custom 1..8 | No | No |
| Paging | No | No |
| Paging Group | No | No |
Analog and Time Stamped Analog Alarm fields
| Field Name | NewAlarm | Invalid History |
|---|---|---|
| Variable Tag | No | Yes |
| High High | No | Yes |
| High | No | Yes |
| Low Low | No | Yes |
| Low | No | Yes |
| SetPoint | No | Yes |
| Deviation | No | Yes |
| High High Delay | No | No |
| High Delay | No | No |
| Low Low Delay | No | No |
| Low Delay | No | No |
| DEviation Delay | No | No |
| Rate | No | Yes |
| Deadband | No | Yes |
| Format | No | No |
Digital and Time Stamped Digital Alarm fields
| Field Name | New Alarm | Invalid History |
|---|---|---|
| Variable Tag A | No | Yes |
| Variable Tag B | No | Yes |
Time Stamped Alarm fields
| Field Name | New Alarm | Invalid History |
|---|---|---|
| Variable Tag | No | Yes |
| Timer | No | Yes |
Advanced Alarm fields
| Field Name | New Alarm | Invalid History |
|---|---|---|
| Expression | No | Yes |
Multi-Digital Alarm fields
| Field Name | New Alarm | Invalid History |
|---|---|---|
| Variable Tag A | No | Yes |
| Variable Tag B | No | Yes |
| Variable Tag C | No | Yes |
| Realarm | No | Yes |
| On Function | No | No |
| Off Function | No | No |
| State | No | Yes |
| State Description | No | No |
Argyle Analog Alarm fields
| Field Name | New Alarm | Invalid History |
|---|---|---|
| Variable Tag | No | Yes |
| SetPoint | No | Yes |
| High High | No | Yes |
| High | No | Yes |
| Low | No | Yes |
| Low Low | No | Yes |
| Deviation | No | Yes |
| Rate | No | Yes |
| Deadband | No | Yes |
| Format | No | No |
| Trigger | No | No |
| Latch | No | No |
| Control Timeout | No | No |
Trend Servers
Changes to the following properties of trends make existing trend files invalid and result in the creation of a new trend file (renaming the old one for backup):
Changing the scale of a tag will make the trend history invalid.
Effect of reload on a modified Trend:
| Field Name | New Trend | Invalid History |
|---|---|---|
| Trend Tag Name | Yes | No |
| Cluster Name | Yes | No |
| Expression | No | Yes |
| Trigger | No | Yes |
| Comment | No | No |
| Privilege | No | No |
| Area | No | No |
| Eng Units | No | No |
| Format | No | No |
Report Servers
Effect of reload on a modified Report:
| Field Name | New Reports | Invalid History |
|---|---|---|
| Report Name | Yes | No |
| Cluster Name | Yes | No |
| Time | No | Yes |
| Period | No | Yes |
| Trigger | No | No |
| Report File Format | No | No |
| Output Device | No | No |
| Privilege | No | No |
| Area | No | No |
Effect of reload on a modified Accumulator:
| Field Name | New Accumulators | Invalid History |
|---|---|---|
| Name | Yes | No |
| Cluster Name | Yes | No |
| Trigger | No | Yes |
| Run Time | No | Yes |
| No. of Starts | No | No |
| Totaliser Inc | No | No |
| Totaliser | No | No |
| Comment | No | No |
| Privilege | No | No |
| Area | No | No |