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Updated: 20.05.2019


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INVALID

If a record enters the state INVALID, this means that the value of the record is not longer valid. This can happen for example when hardware is broken or not connected (or switched off). On displays, use white to indicate the invalid state.

Directly after reboot all records are set to INVALID to indicate that they have never been processed. The following example shows that the record X10SA-OP-BPM3:FIT-H0 has not been processed since the last reboot of the IOC:

zimoch_e@pc4859[/work] ~ > caget X10SA-OP-BPM3:FIT-H0
X10SA-OP-BPM3:FIT-H0 -3082.0000 (SEVR:INVALID STAT:UDF)
On the command line, the fields SEVR (Severity) and STAT (Status) are displayed; UDF means undefined. After the record has been processed for the first time (for example when it reads from the hardware), the state changes automaticaly.



Zimoch Elke 2009-04-14

Updated: 20.05.2019   Source: /afs/psi.ch/project/epics/webhosting/training/handouts/e_basehandouts/node27.html