EPICS Record Reference Manual. Philip Stanley, Janet Anderson, Marty Kraimer. Wikified by Andrew Johnson. Copyright · Preface. EPICS Input Output Controller (IOC) Record Reference Manual. Janet B. Anderson and. Martin R. Kraimer. Advanced Photon Source. Issue 1: December 1. EPICS R Channel Access Reference Manual .. link -nologo /LTCG / incremental:no /opt:ref /release /version -out: acctst. obj .. by the EPICS record support (see the EPICS Application Developer Guide ).

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This page Page Discussion History. The expression uses the values retrieved from the INP x links as operands, though epicw can be used as operands too. The resulting value is placed in the VAL field and can be accessed from there. Natural log unary EXP: The LA-LL fields are used to decide when to trigger monitors for the corresponding fields. These parameters are used to determine when to send monitors for the value fields.

RRM 3-14 Calculation

The EGU string is solely for an operator’s sake and does not have to be used. The HYST field defines an alarm deadband for each limit. Square root unary MIN: The fields can be database links, channel access links, or constants. These fields are listed in Scan Fields.


The Reverse Polish expression is evaluated more efficiently during run-time than an infix expression. No Literals Standard double precision floating point numbers Inf: Yes The keyword VAL returns rrecord current contents of the VAL field which can be written to by a CA put, so it might not be the result from last time the expression was evaluated.

Prior to Base 3. This page was last edited on manuaal Marchat Alarm Fields lists other fields related to alarms that are common to all record types.

RRM Calculation – EPICSWIKI

They cannot be hardware addresses. Conditional Expression The C language’s question mark operator is supported. The keyword VAL returns the current contents of the VAL field which can be written to by a CA put, so it might not be rreference result from last time the expression was evaluated. The comma is supported when used to separate the arguments of a binary function. It is this expression which is actually used to calculate VAL.

For instance, if LA does not equal the value for A, monitors for A are triggered. The calculation or “Calc” rererence is used to perform algebraic, relational, and logical operations on values retrieved from other records.

Natural log unary LN: All alphabetic elements described below are case independent, so upper and lower case letters may be used and mixed in the variable and function names as desired. Nested parenthesis are supported.


The LALM field is used to implement the hysteresis factor for the alarm limits. In addition, Scanning Specification explains how these fields are used.

Minimum any number of args MAX: Retrieved from ” https: The semicolon is used to separate expressions. The CALC field contains the infix expression which the record routine will use when it processes the record. Not a Number Constants PI: See Monitor Specification referrence a complete explanation of monitors.

The monitors are sent when the value field exceeds the last monitored field by the appropriate deadband, the ADEL for archiver monitors and the MDEL field for all other types of monitors.

See Address Specification for information on how to specify database links. Spaces may be used anywhere within an expression except between the characters that make up a single expression element.