National Instruments FP-3000 - Manual (Page 7)

Contents
© National Instruments Corporation vii FieldPoint FP-3000 User Manual
Chapter 4
Block Reference
Block Overview .............................................................................................................4-1
Function Blocks...............................................................................................4-1
Transducer Blocks ...........................................................................................4-2
Resource Block................................................................................................4-3
Types of Function Blocks ..............................................................................................4-3
AI (Analog Input) ............................................................................................4-3
AO (Analog Output)........................................................................................4-3
PID (Proportional–Integral–Derivative)..........................................................4-3
DI (Discrete Input) ..........................................................................................4-3
DO (Discrete Output) ......................................................................................4-4
CDO (Complex Discrete Output)....................................................................4-4
LOG (FieldPoint Log Block) (FP-3000 Specific) ...........................................4-4
STAT (FieldPoint Statistics Block) (FP-3000 Specific) .................................4-4
Expression Block (FP-3000 Specific) .............................................................4-5
Data Types Supported .......................................................................4-5
Status Calculation Rules ...................................................................4-6
Syntax Rules .....................................................................................4-6
Program Constructs...........................................................................4-7
Supported FieldPoint Modules and Channels................................................................4-15
PID Control....................................................................................................................4-16
PID Loop Execution Time...............................................................................4-17
PID Loop Execution Time Considerations .......................................4-17
Alarming ........................................................................................................................4-18
Alarm Parameters ............................................................................................4-19
UNACKNOWLEDGED ...................................................................4-19
ALARM_STATE/UPDATE_STATE ..............................................4-19
TIME_STAMP..................................................................................4-20
SUBCODE ........................................................................................4-20
VALUE .............................................................................................4-20
Status and Mode Handling Overview ............................................................................4-20
Status Handling ...............................................................................................4-21
Quality...............................................................................................4-21
Substatus ...........................................................................................4-22
Limit..................................................................................................4-22
MODE_BLK Parameter and Mode Handling .................................................4-22
TARGET Mode.................................................................................4-22
ACTUAL Mode ................................................................................4-23
PERMITTED Mode ..........................................................................4-23
NORMAL Mode ...............................................................................4-23