If a communication error is detected (with an I/O Device) or if the data is invalid, one of the following alert messages are written to the report (instead of the value):
|
Error |
Meaning |
|---|---|
|
#ASS |
The value is incorrectly associated (with a substitution string or Genie). |
|
#COM |
Communication with the I/O Device has been lost |
|
#DIV/0 |
An attempt was made to divide a number by 0 (zero) |
|
#ERR |
An uncommon error has occurred. (Use the IsError function to find the occurrence.) |
|
#MEM |
Out of memory or more than 64 kb bytes of memory requested. |
|
#PEND |
Data from this device is pending an initial update to display a value. |
|
#RANGE |
The value returned is out of range |
|
#STACK |
The value has caused a stack overflow |
|
#WAIT |
Data from this scheduled device is not available as it has not reached its scheduled interval and has no cache value. |
For example:
Report Format:
{PV_1} {SP_1} {OP_1}
If the above report is run when the value of PV_1 is out of range (for example 101.5), SP_1 is 42.35 and OP_1 is 60.0, the output of the report is:
Report Output:
#RANGE 42.35 60.0
When reports are written to a database device, you might sometimes want to disable the alert messages and write the values to the report (even if the values are invalid). Use the ERR_FORMAT_OFF command to disable alert messages and write data as values.
For example:
Report Format:
{ERR_FORMAT_OFF}
{PV_1} {SP_1} {OP_1}
If the above report is run when the value of PV_1 is out of range (for example 101.5)
, SP_1 is 42.35 and OP_1 is 60.0, the output of the report is:
Report Output:
42.35 60.0
To re-enable the alert messages, use the ERR_FORMAT_ON specifier.
Note: If an I/O Device goes offline and you have disabled communication errors, the value printed into the report is either 0 (zero) or the last value read from the I/O Device when the report was last run. In either case, the value is invalid.
See Also