User Manual

Logic Functions - Book 2
CONTENTS
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CONTENTS
Page
SECTION 8 - ALGORITHM FUNCTIONS DATABASE PARAMETERS
8.1 ALGORITHM BLOCKS ......................................................................................................................8-1
8.2 EXPRESSION BLOCK (EX) ................................................................................................................. 3
8.2.1 Expression Block Operation........................................................................................................... 6
8.2.2 Expression Block Parameters........................................................................................................ 8
8.2.3 Typical Block Connections for Expression Block ......................................................................... 14
8.2.4 Expression Block Events.............................................................................................................. 15
8.2.5 Example 1: Using Expression Blocks to Store Trend Data.......................................................... 15
8.2.6 Example 2: Using IF-THEN-ELSE Statements in Expression Blocks.......................................... 16
8.3 INPUT COMMUNICATION BLOCK (IC)............................................................................................. 17
8.3.1 Input Communication Block Operation......................................................................................... 19
8.3.2 Input Communication Block Parameters...................................................................................... 20
8.3.3 Typical Block Connections for Input Communication Block ......................................................... 24
8.3.4 Input Communication Block Events ............................................................................................. 24
8.4 OUTPUT COMMUNICATION BLOCK (OC) ....................................................................................... 25
8.4.1 Output Communication Block Operation...................................................................................... 27
8.4.2 Output Communication Block Parameters................................................................................... 27
8.4.3 Typical Block Connections for Output Communication Block ...................................................... 29
8.4.4 Output Communication Block Events........................................................................................... 29
8. 5 LINEARIZATION BLOCK (LN)............................................................................................................ 31
8.5.1 Linearization Block Capabilities ................................................................................................... 32
8.5.2 Linearization Block Parameters ................................................................................................... 37
8.5.3 Typical Softwiring Block Structures for Linearization Block ......................................................... 41
8.5.4 Using the Linearization Block....................................................................................................... 42
8.5.5 Linearization Block Events........................................................................................................... 42
8.6 PROCESS ALARM BLOCK (PA)........................................................................................................ 43
8.6.1 Process Alarm Block Capabilities ................................................................................................ 44
8.6.2 Process Alarm Block Parameters ................................................................................................ 46
8.6.3 Typical Softwiring Block Structures for Process Alarm Block ...................................................... 50
8.6.4 Using the Process Alarm Block.................................................................................................... 51
8.7 TIMER BLOCK (TM) ........................................................................................................................... 53
8.7.1 Timer Block Operation ................................................................................................................. 54
8.7.2 Timer Block Parameters .............................................................................................................. 56
8.7.3 Time Values ................................................................................................................................. 60
8.7.4 Typical Softwiring Block Structures for Timer Block..................................................................... 60
8.7.5 Using the Timer Block.................................................................................................................. 61
8.7.6 Timer Block Events ...................................................................................................................... 62
8.8 NOTIFICATION/REQUEST MESSAGE BLOCK (NM) ....................................................................... 63
8.8.1 Notification/Request Message Block Operation........................................................................... 66
8.8.2 Notification/Request Message Block Parameters........................................................................ 66
8.8.3 Typical Block Connections for Notification/Request Message Block ........................................... 71
8.8.4 Notification/Request Message Block Events................................................................................ 72
8.8.5 Using the Notification/Request Message Block ........................................................................... 72
8.9 SUPERVISORY MESSAGE BLOCK (SM) ......................................................................................... 75
8.9.1 Supervisory Message Block Operation........................................................................................78
8.9.2 Supervisory Message Block Parameters ..................................................................................... 78
8.9.3 Typical Block Connections for Supervisory Message Block......................................................... 86
8.9.4 Supervisory Message Block Events............................................................................................. 86
8.9.5 Using the Supervisory Message Block......................................................................................... 87