User Manual

Logic Functions - Book 2
EXPRESSION BLOCK
8-8
8.2.2 Expression Block Parameters
The mnemonics, valid values, and data types for all fields that may be selected for display
and/or be used in making softwiring connections are listed in Table 8-1. The following further
defines the expression block configuration parameters.
Block Type
EX This is the expression block type. The expression block type code is 15.
Occurrence
1 to 4096 There may be up to 4096 ‘instances’ allowed of the EX block type (subject to
configuration and database size limitations).
Expression
Algebraic expression written in terms of user names for inputs, values (use usual convention
for data types) for constants, ‘C’ symbology for operators and functions. The order of
evaluation of an expression is determined by operator precedence, and parentheses may be
used to change the order of evaluation. An entry is required (there is no default). See
Section 8.2.1 for a description of the expression evaluation operation and valid operators.
Table 8-1. Expression Block Attributes, Valid Values, Mnemonics, and Data Types
Field Name / Attribute Mnemonic Valid Values CWR Data Type Attr
Version VERSION 1, 2, 3 – – R Long State 00
Block Length BLKLEN Number of bytes of database – – R Count 01
Block State
STATE RUN(0), HOLD(1), OFF(2),
DEBUG(3)
CWR Short State 02
Bad Inputs
BADINP Rejected (0), Accepted (1) CWR Discrete 03
Diagnostic Group
SUPPGRP NONE, 1, 2, 3, 4, 5, 6, 7 CWR Long State 04
Calculation error
CERRS ENABLE (0), SUPPRESS (1) CWR Discrete 05
Calc. Error Unacked CERRU NO (0), YES (1) – WR Discrete 06
Calc. Error Unacked Quality CERRUQ GOOD (0), BAD (1) – WR Discrete 07
Calc. Error Active CERRA NO (0), YES (1) – WR Discrete 08
Calc. Error Active Quality CERRAQ GOOD (0), BAD (1) – WR Discrete 09
Set quality bad on calculation
error?
SETQBAD NO (0), YES (1) CWR Discrete 10