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© National Instruments Corporation D-1 FieldPoint FP-3000 User Manual
D
Advanced Function
Block Behavior
This appendix explains advanced features of function blocks that are
unnecessary to establish simple control strategies. Use this information to
diagnose problems in control strategies and to develop systems that
implement supervisory control by a host computer.
Cascade Initialization
F
OUNDATION
Fieldbus provides a protocol called Cascade Initialization that
allows a control function block to smoothly transition from
Man
to
Auto
mode. Cascade Initialization allows the PID algorithm to know the current
setpoint of the AO block to balance the actual setpoint with the control’s
setpoint over time. Cascade Initialization is also used to prevent windup in
the PID.
Parameter Connections for Cascade Initialization
Cascade initialization takes place between two blocks: an upstream
controlling block, and a downstream controlled block. In a PID loop, the
upstream block is the PID block, and the downstream block is the AO
block. In the case of cascaded PID blocks, the upstream PID feeds a
setpoint into a second PID that is acting as the downstream block. In both
cases, the parameter connections are the same. The output (
OUT
) parameter
of the upstream block is connected to the cascade input (
CAS_IN
)
parameter of the downstream block. This connection controls the setpoint
of the downstream block. To allow the upstream block to determine the
current setpoint of the downstream block, you must also connect the
backward calculation output (
BKCAL_OUT
) parameter of the downstream
block with the backward calculation input (
BKCAL_IN
)oftheupstream
block. The connections are shown in Figure D-1.
- FP-3000 Network Module 1
- User Manual 1
- Important Information 3
- Conventions 4
- Chapter 3 6
- Chapter 4 7
- Appendix A 8
- Appendix B 8
- Contents 10
- Appendix C 11
- Appendix G 13
- Technical Support Resources 13
- Glossary 13
- Overview 14
- Function Blocks 15
- PID Control 16
- Interoperability 17
- Scheduling Functionality 17
- HotPnP (Hot Plug and Play) 17
- OUNDATION 18
- Import Device Descriptions 19
- MountingtheFP-3000onaDINRail 21
- Figure 2-3 23
- Connecting Terminal Bases 23
- Removing I/O Modules 26
- Connect Power to the FP-3000 28
- Supplying Power for Outputs 29
- Isolation 29
- Power Connections 30
- LED Indicators 31
- FF-H1 PORT 32
- STATUS NETWORK 32
- Table 2-1 33
- Autoconfigure the FP-3000 34
- Updating the FP-3000 Firmware 35
- Example Applications 36
- Fieldbus Using FP-3000 37
- Create an FP-AI-110 Block 38
- Assign a Tag to the New Block 38
- Select the Module and Channel 38
- Set the Input Range 39
- Scale the Reading 39
- Set Up Scheduling 40
- Bring the Block Online 41
- Getting Started 42
- Taking Temperature Readings 43
- Create an FP-TC-120 Block 43
- Controlling a Heating Element 46
- Create an FP-AO-200 Block 46
- Set the Output Range 46
- Scale the Output 47
- Create a PID Block 48
- Scale the PID 49
- Tune the PID 51
- Set Alarms 52
- Block Reference 53
- Transducer Blocks 54
- Types of Function Blocks 55
- DO (Discrete Output) 56
- CDO (Complex Discrete Output) 56
- Data Types Supported 57
- Status Calculation Rules 58
- Syntax Rules 58
- Program Constructs 59
- Constants 60
- Operators 61
- Flow Control 62
- Delimiters 62
- Functions 62
- Table 4-5. Function Operators 63
- Uint32 is_bad(vs_float F) OR 63
- Uint32 is_bad(vs_discrete D) 63
- Chapter 4 Block Reference 64
- Table 4-6 67
- FieldPoint Modules 67
- PID Loop Execution Time 69
- Alarming 70
- Alarm Parameters 71
- UNACKNOWLEDGED 71
- ALARM_STATE/UPDATE_STATE 71
- TIME_STAMP 72
- Status Handling 73
- Substatus 74
- TARGET Mode 74
- ACTUAL Mode 75
- PERMITTED Mode 75
- NORMAL Mode 75
- Configuring the FP-3000 77
- Write Lock 78
- Fieldbus Parameters 79
- Table B-1 81
- Error Codes 81
- BYPASS (Scaling, Tuning) 82
- CAS_IN (Process) 82
- CAS_IN_D (Process) 82
- CHANNEL (I/O, Process) 82
- CONFIRM_TIME (Alarming) 83
- SET_FSTATE 85
- CLR_FSTATE 85
- FEATURES 85
- FEATURE_SEL 85
- FF_GAIN (Scaling, Tuning) 86
- FF_SCALE (Scaling) 86
- HI_PRI (Alarming) 89
- IN (Process, Scaling, Tuning) 89
- L_TYPE (Scaling) 90
- MAX_NOTIFY (Alarming) 92
- MEMORY_SIZE (Diagnostic) 92
- NV_CYCLE_T (Diagnostic) 93
- UNIT_INDEX 94
- OUT_SCALE 95
- SHED_RCAS 95
- ROUT_OUT (Process) 97
- SEL_TYPE (Scaling) 97
- SHED_RCAS (Mode Shedding) 98
- SHED_ROUT (Mode Shedding) 98
- SIMULATE (Option) 98
- WRITE_PRI (Alarming, Option) 102
- XD_SCALE (Scaling) 102
- XD_STATE (Process) 102
- FP-3000 Specific Parameters 103
- CFG_OPTS 104
- CHECKBACK 104
- BLOCK_ALMS_ACT 104
- BLOCK_RESET 104
- CLEAR_LOG 105
- D_IN_0–D_IN_3 105
- D_OUT_0–D_OUT_7 105
- Module in Configuration 109
- Module Okay 109
- Incorrect Module for Block 109
- HI_OUT_D 110
- INIT_STATUS 110
- LAST_BLOCK_EVENT 110
- LAST_RUN_ERROR 111
- LO_LO_OUT_D 111
- LO_OUT_D 111
- LTYPE_DOMAIN_INDEX 111
- NVM_LIFE 111
- VERSION_INFORMATION 113
- Advanced Function 114
- Block Behavior 114
- Upstream 115
- Downstream 115
- Remote Cascades 116
- Fault State and Mode Shedding 117
- Specifications 118
- Troubleshooting 119
- Appendix F Troubleshooting 120
- I/O Module Problems 121
- Common Questions 125
- TRK_IN_D.VALUE 126
- TRK_VAL.VALUE 126
- EXECUTION_TIME 126
- Hexadecimal 126
- Worldwide Support 132
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