Allen-Bradley ProcessLogix 1757 Series User manual

ProcessLogix
Function Blocks
1757 Series
Reference Manual
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Important User Information
Because of the variety of uses for the products described in this
publication, those responsible for the application and use of these
products must satisfy themselves that all necessary steps have been
taken to assure that each application and use meets all performance
and safety requirements, including any applicable laws, regulations,
codes and standards. In no event will Allen-Bradley be responsible
or liable for indirect or consequential damage resulting from the use
or application of these products.
Any illustrations, charts, sample programs, and layout examples
shown in this publication are intended solely for purposes of
example. Since there are many variables and requirements associated
with any particular installation, Allen-Bradley does not assume
responsibility or liability (to include intellectual property liability) for
actual use based upon the examples shown in this publication.
Allen-Bradley publication SGI-1.1, Safety Guidelines for the
Application, Installation and Maintenance of Solid-State Control
(available from your local Allen-Bradley office), describes some
important differences between solid-state equipment and
electromechanical devices that should be taken into consideration
when applying products such as those described in this publication.
Reproduction of the contents of this copyrighted publication, in
whole or part, without written permission of Rockwell Automation, is
prohibited.
Throughout this publication, notes may be used to make you aware
of safety considerations. The following annotations and their
accompanying statements help you to identify a potential hazard,
avoid a potential hazard, and recognize the consequences of a
potential hazard:
Allen-Bradley is a trademark of Rockwell Automation
WARNING
!
Identifies information about practices or
circumstances that can cause an explosion in a
hazardous environment, which may lead to personal
injury or death, property damage, or economic loss.
ATTENTION
!
Identifies information about practices or
circumstances that can lead to personal injury or
death, property damage, or economic loss.
IMPORTANT Identifies information that is critical for successful
application and understanding of the product.
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Contact your local Rockwell Automation representative for:
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vPublication 1757-RM810A-EN-P - May 2002
Table of Contents
Important User Information . . . . . . . . . . . . . . . . . . . . . . . . . iii
Rockwell Automation Support . . . . . . . . . . . . . . . . . . . . . . . iv
Local Product Support . . . . . . . . . . . . . . . . . . . . . . . . . . iv
Technical Product Assistance . . . . . . . . . . . . . . . . . . . . . iv
Your Questions or Comments on this Manual . . . . . . . . . iv
Chapter 1
Introduction to Control Builder
Components
Component Categories and Types . . . . . . . . . . . . . . . . . . . 1-1
Hardware relation category . . . . . . . . . . . . . . . . . . . . . 1-1
Functional relation category . . . . . . . . . . . . . . . . . . . . . 1-5
Component Libraries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
System (SYSTEM) Library . . . . . . . . . . . . . . . . . . . . . . . 1-7
Auxiliary (AUXILIARY) Library . . . . . . . . . . . . . . . . . . . 1-7
Device Control (DEVCTL) Library . . . . . . . . . . . . . . . . . 1-7
Data Acquisition (DATAACQ) Library . . . . . . . . . . . . . . 1-7
Input/Output Module (IO) Library . . . . . . . . . . . . . . . . 1-8
Input/Output Channel (IOCHANNEL) Library . . . . . . . . 1-9
Logic (LOGIC) Library . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Regulatory Control (REGCTL) library. . . . . . . . . . . . . . . 1-10
Sequential Control Module (SCM) library . . . . . . . . . . . 1-10
Utility (UTILITY) Library. . . . . . . . . . . . . . . . . . . . . . . . 1-10
ControlNet Interoperability (Exchange) Library . . . . . . . 1-11
Pulse Input Channel/Module (PULSEINPUT) Library . . . 1-11
1797 FLEX Ex Modules (RAIL_IO_HAZ) . . . . . . . . . . . . 1-11
Profibus Interface (PBUSIF) Library. . . . . . . . . . . . . . . . 1-11
1794 FLEX I/O Modules (RAIL_IO) . . . . . . . . . . . . . . . . 1-12
Fieldbus Interface (FBUSIF) Library . . . . . . . . . . . . . . . 1-12
Chapter 2
Physical Equipment Blocks
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Control Processor Module (CPM) . . . . . . . . . . . . . . . . . 2-1
Control Execution Environment (CEE) . . . . . . . . . . . . . 2-2
Redundancy Module (RM) . . . . . . . . . . . . . . . . . . . . . . 2-3
Input Module Blocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
1756-IA16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
1756-IA16I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
1756-IA8D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
1756-IB16D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
1756-IB16I. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
1756-IB32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
1756-IF6I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
1756-IF16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
1756-IM16I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
1756-IR6I. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
1756-IT6I. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
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vi
Output Module Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
1756-OA16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
1756-OA16I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
1756-OA8D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
1756-OB16D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
1756-OB16I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
1756-OB32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
1756-OF6CI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
1756-OF6VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
1756-OF8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
Serial Interface Module (SIM) TC-MUX021 . . . . . . . . . . 2-19
Chapter 3
Functional Blocks
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
System Blocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
CONTROLMODULE (Continuous Control). . . . . . . . . . . 3-1
SCM (Sequential Control) . . . . . . . . . . . . . . . . . . . . . . . 3-2
Auxiliary Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
AUXCALC (Auxiliary Calculation) . . . . . . . . . . . . . . . . . 3-3
DEADTIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
GENLIN (General Linearization) . . . . . . . . . . . . . . . . . . 3-6
LEADLAG (Lead Lag) . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
TOTALIZER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Device Control Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
DEVCTL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Data Acquisition Block . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
DATAACQ. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
IO Channel Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
AICHANNEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
AOCHANNEL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
DICHANNEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
DOCHANNEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
PWMCHANNEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
SIFLAGARRCH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
SINUMARRCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
SITEXTARRCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
Logic Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
2OO3 (2 out of 3 voting) . . . . . . . . . . . . . . . . . . . . . . . 3-16
AND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
CHECKBAD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
DELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
EQ (Equal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
FTRIG (Falling-edge Trigger) . . . . . . . . . . . . . . . . . . . . 3-18
GE (Greater than or Equal to). . . . . . . . . . . . . . . . . . . . 3-18
GT (Greater Than) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
LE (Less than or Equal to) . . . . . . . . . . . . . . . . . . . . . . 3-19

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LIMIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
LT (Less Than). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
MAX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
MAXPULSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
MIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
MINPULSE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
MUX (Multiplexer) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
MUXREAL (Real Multiplexer) . . . . . . . . . . . . . . . . . . . . 3-22
MVOTE (Majority Voting). . . . . . . . . . . . . . . . . . . . . . . 3-22
NAND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23
NE (Not Equal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23
nOON (n out of N voting) . . . . . . . . . . . . . . . . . . . . . . 3-24
NOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
NOT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
OFFDELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
ONDELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
OR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26
PULSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26
QOR (Qualified OR) . . . . . . . . . . . . . . . . . . . . . . . . . . 3-27
ROL (Rotate Output Left) . . . . . . . . . . . . . . . . . . . . . . . 3-27
ROR (Rotate Output Right) . . . . . . . . . . . . . . . . . . . . . . 3-27
RS (Reset dominant SR-FLIP-FLOP) . . . . . . . . . . . . . . . . 3-28
RTRIG (Rising edge Trigger). . . . . . . . . . . . . . . . . . . . . 3-28
SEL (Binary Selection) . . . . . . . . . . . . . . . . . . . . . . . . . 3-28
SELREAL (Real Selection) . . . . . . . . . . . . . . . . . . . . . . . 3-29
SHL (Shift Output Left). . . . . . . . . . . . . . . . . . . . . . . . . 3-29
SHR (Shift Output Right) . . . . . . . . . . . . . . . . . . . . . . . 3-29
SR (Set dominant SR-FLIP-FLOP). . . . . . . . . . . . . . . . . . 3-30
TRIG (Rising or Falling edge Trigger) . . . . . . . . . . . . . . 3-30
WATCHDOG. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30
XOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-31
Regulatory Control Blocks . . . . . . . . . . . . . . . . . . . . . . . . . 3-31
AUTOMAN (Auto Manual) . . . . . . . . . . . . . . . . . . . . . . 3-31
FANOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-33
OVRDSEL(Override Selector) . . . . . . . . . . . . . . . . . . . . 3-35
PID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-37
PIDFF (PID Feedforward). . . . . . . . . . . . . . . . . . . . . . . 3-39
POSPROP (Position Proportional) . . . . . . . . . . . . . . . . . 3-42
PULSECOUNT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-45
PULSELENGTH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-46
RAMPSOAK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-47
RATIOBIAS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-49
REGCALC (Regulatory Control Calculator). . . . . . . . . . . 3-52
REMCAS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-55
SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-57
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Publication 1757-RM810A-EN-P - May 2002
viii
Sequential Control Module Blocks . . . . . . . . . . . . . . . . . . . 3-59
HANDLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-59
STEP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-60
TRANSITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-61
Utility Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-62
FLAG. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-62
FLAGARRAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-62
MESSAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-63
NUMERIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-63
NUMERICARRAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-64
PUSH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-64
TEXTARRAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-68
TIMER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-68
TYPECONVERT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-69
Exchange Blocks (ControlNet Interoperability) . . . . . . . . . . 3-70
REQFLAGARRAY (Request Flag Array) . . . . . . . . . . . . . 3-70
REQNUMARRAY (Request Number Array). . . . . . . . . . . 3-70
REQTEXTARRAY (Request Text Array) . . . . . . . . . . . . . 3-71
RSPFLAGARRAY (Response Flag Array) . . . . . . . . . . . . 3-71
RSPNUMARRAY (Response Number Array) . . . . . . . . . . 3-72
RSPTEXTARRAY (Response Text Array) . . . . . . . . . . . . 3-72
Pulse Input Channel/Module Blocks . . . . . . . . . . . . . . . . . 3-73
PICFASTCUTOFF
(Pulse Input Channel with Fast Cutoff) . . . . . . . . . . . . . 3-73
PICHANNEL (Pulse Input Channel). . . . . . . . . . . . . . . . 3-74
PITOTALIZER (Pulse Input Totalizer) . . . . . . . . . . . . . . 3-74
1757-PIM (Pulse Input Module Block). . . . . . . . . . . . . . 3-75

1Publication 1757-RM810A-EN-P - May 2002
Chapter 1
Introduction to Control Builder Components
Component Categories and
Types
We divide the Control Builder components into these two major
categories:
•Hardware Relation Category (physical equipment)
•Functional Relation Category
Hardware relation category
The hardware relation category includes the physical equipment
blocks provided in Control Builder. These blocks let you quickly
integrate the related control hardware into your control strategy.
Figure 1.1 on page 1-2 shows the physical equipment that relates to
the corresponding hardware relations covered in this document for a
typical non-redundant system. Figure 1.2 on page 1-3 shows the
physical equipment that relates to the corresponding hardware
relations for a typical redundant system.
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Publication 1757-RM810A-EN-P - May 2002
1-2 Introduction to Control Builder Components
Figure 1.1 Physical Equipment reference for corresponding hardware component
in typical non-redundant system architecture.
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