Emerson Rosemount OCX 8800 Reference Manual page 8

Contents
7.6 Transducer block ........................................................................................................................113
7.6.1
7.7 Transducer block enumerations ................................................................................................. 122
7.7.1
7.7.2
7.7.3
7.7.4
7.7.5
7.7.6
7.8 Analog input (AI) function block ................................................................................................. 130
7.8.1
7.8.2
7.8.3
7.8.4
7.8.5
7.8.6
7.8.7
7.8.8
7.8.9
7.8.10
7.8.11
7.8.12
7.8.13
7.8.14
7.8.15
7.8.16
7.8.17
7.9 Proportional/integral/derivative (PID) function block ................................................................. 149
7.9.1
7.9.2
7.9.3
7.9.4
7.9.5
7.9.6
7.9.7
7.9.8
7.9.9
7.9.10
7.9.11
7.9.12
7.9.13
7.10 Airthmetic (ARTHM) function block ............................................................................................172
7.10.1
7.10.2
7.10.3
7.10.4
7.10.5
7.10.6
7.11 Advanced topics .........................................................................................................................179
7.11.1
7.11.2
iv
Transducer block parameters ...................................................................................... 114
Calibration states .........................................................................................................122
Calibration step command .......................................................................................... 123
Transducer block channel assignments for AI blocks ....................................................128
Transducer block channel status ..................................................................................128
Transducer block simulate ........................................................................................... 129
Support transducer block errors .................................................................................. 129
Introduction ................................................................................................................ 130
Simulation ................................................................................................................... 135
Filtering ....................................................................................................................... 138
Signal conversion .........................................................................................................138
Direct signal conversion ...............................................................................................138
Indirect signal conversion ............................................................................................ 139
Indirect square root ..................................................................................................... 139
Block errors ................................................................................................................. 139
Modes ......................................................................................................................... 140
Alarm detection ...........................................................................................................140
Status handling ............................................................................................................141
Advanced features .......................................................................................................142
Application information ...............................................................................................142
Application examples .................................................................................................. 143
Pressure transmitter used to measure level in an open tank .........................................143
Differential pressure transmitter to measure flow ........................................................147
Troubleshooting ..........................................................................................................147
Setpoint selection and limiting .................................................................................... 158
PID equation structures ............................................................................................... 160
Reverse and direct action .............................................................................................161
Reset limiting .............................................................................................................. 161
Block errors ................................................................................................................. 161
Modes ......................................................................................................................... 162
Alarm detection ...........................................................................................................162
Status handling ............................................................................................................163
Application information ...............................................................................................164
Application examples .................................................................................................. 165
Cascade control with master and slave loops ............................................................... 167
Cascade control with override ..................................................................................... 169
Troubleshooting ..........................................................................................................170
Block errors ................................................................................................................. 175
Modes ......................................................................................................................... 176
Alarm detection ...........................................................................................................176
Block execution ........................................................................................................... 177
Compensation input calculations ................................................................................ 177
Application information ...............................................................................................178
Arithmetic types .......................................................................................................... 179
Troubleshooting ..........................................................................................................180
OCX 8800