Math Functions, Addition ADD, Maximum Total | GE GFK-0804B specs

4

Math Functions

The Micro PLC instruction set includes these Math functions:

Addition	Adds together two numbers and places the total in a specified
	register.

Subtraction The Subtraction function subtracts one number from another and places the result in a specified register.

Multiplication The Multiply function multiplies one number by another and places the result in two consecutive registers.

Division	The Division function divides one number by another, and
	places the result in two consecutive registers.

For the Math functions, all numbers are assumed to be positive. There are no negative numbers.

Power flow from a Math function is always true.

Addition (ADD)

The Addition function adds together two numbers and places the total in a specified register.

number + number =

register

46130

The numbers added can be constants, as in the second addition shown on the facing page, or the contents of register locations in memory. For example, if R1 contains the value 23 and you add the constant 16 to it, then register R3 will contain the value 39.

Maximum Total

The maximum total for the Addition function is 65535. If the total exceeds 65535, only the excess is placed in the specified register. For example:

1st number	2nd number	Total in register
50,000	+ 50,000	= 34464 (excess above 65536)

The program can compare the total with the two numbers that were added. If the total is less than either number, a ªrolloverº has occurred.

4-22

Micro PLC Programmer's Guide ± April 1994

GFK-0804B

Image 63

$GE GFK-0804B manual Math Functions, Addition ADD, Maximum Total, Division$

Contents

GE Fanuc Automation GFL±002 Related Publications Content of this Manual Preface Technical AssistanceWe Welcome Your Comments and Suggestions Contents Math Functions Appendix a Using Directories Appendix B Micro PLC Protocol Appendix E Data Acquisition, Logging, and Display Program Chapter Programming for the Micro PLC Device Designation Programming Basics PLC Programs Power Flow in a Program Micro PLC Instruction Set Programming Devices and Formats Programming with the Programming SoftwareProgramming on a Hand-held Programmer Non-retentive and Retentive Registers Memory Types and AddressesConstants and Register Values in a Program Memor y Map Hold Output Coil C1021 Special CoilsSec Clock C1018 Start-up Scan Coil C1019 Maximum Values Programming for an Analog Expander UnitAnalog Scaling Analog References Example #1 Programming Examples Chapter Programming with the Programming Software Programming Operations Using the Programming Functions Programming Functions Creating a Program Rung Running the Programming Software Running the Programming Software from a Hard DiskRunning the Programming Software Directly from a Diskette Editing Basics Horizontal and Vertical Lines in a Rung Element Labels and Rung Labels Deleting a Rung Element Editing a Completed RungSelecting a Rung to Edit Editing a Rung Element Adding a Program Function to a Rung Adding a Contact to a Rung Replacing a Rung Element with a Horizontal Line Replacing a Rung Element with a Similar Element Replacing a Rung Element with a Dissimilar Element Moving Rungs Deleting Rungs Copying Rungs Searching for a Rung or Program Element Chapter Programming with a Hand-held Programmer Program Transfer Program Listing Hand-Held Programmer Key Operation and Displays Entering Program Logic Inserting a Rung Element Deleting a Rung Element, Rung or Program In Memory Deleting a Rung Element Searching Programming Examples Using the HHP Ladder Diagram Chapter Micro PLC Instruction Set Instruction Set Summary Operation Ladder Symbol Description Micro PLC Instruction Set General Programming Software Instructions for Contacts Contacts Programming Normally-Open Contact at the Start of a Rung Normally- Open ContactProgramming Software Instructions Examples and HHP Instructions Programming a Normally-Open Contact in Parallel Programming a Normally-Open Contact in Series Programming Normally-Closed Contact at the Start of a Rung Normally- Closed Contact Programming a Normally-Closed Contact in Parallel Programming a Normally-Closed Contact in Series Example and HHP Instructions Positive Transition Contact Example and HHP Instructions Negative Transition Contact Using Coil Pairs CoilsGeneral Programming Software Instructions for Coils Output Coil Set/Reset Coil Pair ResetExample and HHP Instructions Set End Master Control Relay/End Coil Pair Skip Skip/End Coil Pair Use the Accept F10 key to add the rung to the program TimersProgramming Software Instructions for Timers Enter the other logic required by the Timer On Timer Off Timer Counters Programming Software Instructions for CountersEnter the other logic required by the Counter Up Counter Down Counter Addition Math FunctionsAddition ADD Maximum Total R1+R2 ! R3 R1+ 1! R4 1st number 2nd number Total in register Subtraction SUB R1± 5! R2 R3±R4 ! R5 Examples Multiplication MUL R1 x R2! R3 Whole # Remainder Division DIV Divide Using Division and Multiplication Functions Together Select Move F5 from the Math/Move function keys Move FunctionsMove Move Ladder Diagram Hand-held Programmer R001 0002 R004 R010 R020 R100 Block Move R1E 5! R10 O9E 8! O17 Indirect Move Specifying a Location in the Pointer RegisterSelect I±Move F7 from the Math/Move function keys Start Move Greater Compare FunctionsExamples Equal Press Enter to add the function to the program Not Logic Operations Word Inclusive or IOR Exclusive or XOR Entering the Number of Positions to Shift Shift Register Right Shift Register Left Not Loading and Saving Files Appendix Using Directories Using the Change Directory Function MICRO.CFG FileHints for a Basic Application CMD\MICRO\PALLET CMD\MICRO\RIVETER CMD\MICRO\TRANSFER Hints for an Advanced Application Appendix Micro PLC Protocol Communications Files Special Registers Communications Memory Types and AddressesCommunications Parameters Memory Addresses Reply Communications ProtocolData Format Read Discretes Write Analogs Read AnalogsRead Program Memory Write Discretes Write Program Memory Read StatusStatus Word Stop Program Error ReplyError codes Start Program Microsoft C Large Model Compile w/ -AL Option Communications Functions Microsoft C Small Model Compile w/ -AS Option Turbo C Large Model Compile w/ -ml Option Turbo C Small Model Compile w/ -ms Option IBM Compiler Basic #include dos.h #include stdio.h #include ªMCROCOMM.Cº Sample Programs Sample Basic Program Introduction Appendix RTU Protocol Broadcast Message TypesTransmission Sequence Query Function Code Error Check FieldMessage Fields Station Address Timeout Usage Character FormatMessage Termination Generating Polynomial Cyclic Redundancy Check CRC Software Calculation of CRC±16 Hardware Implementation of CRC-16 Address Function CRC±16 Example CRC±16 Calculation Response Message Length Less CRC Code RTU Message LengthFunction Code And Name Query or Broadcast Message Length Less CRC Code Message Descriptions Message 01 Read Output Table FormatResponse Message 02 Read Input Table Format Message 03 Read Registers Format Message 04 Read Analog Inputs Format Message 05 Force Single Output Format Message 06 Preset Single Register Format Message 07 Read Exception Status Format Message 16 Preset Multiple Registers Format Message 17 Report Device Type Format Invalid Query Message Communication ErrorsInvalid Function Code Error Response Invalid Address Error Response Invalid Transactions Invalid Data Value Error ResponseQuery Processing Failure Error Response Serial Link Timeout Limits of the Demonstration Software Appendix Communications Using Windows DDE Features of the Micro PLC DDE Driver Software Demonstration using Microsoft Excel Simple Demonstration using Microsoft Word Viewing PLC Data in Windows Viewing PLC Data in another DDE-compliant Application Writing Values to the PLC from another ApplicationOrdering Information Using the Display Software with Micro PLC Net Features Overview Appendix E Data Acquisition, Logging, and Display Program Equipment Required Invoking Display Startup Auto Polling Operation Display Software Menus Changing the Screen Colors Editing Summary Data Format Manual Mode Entering Manual Mode Reading One Word of Input, Output, or Register DataReading Multiple Bytes of Input, Output, or Register Data Creating a Bank of Registers for Downloading Data 15,T,1 Writing Data to the Registers Creating or Editing Autopolling Screens Naming an Auto-polling Screen FileSpecifying an Existing File to Edit Creating an Auto-polling Screen Setup for Data Logging During Auto-Polling Formatting Strings for Auto-polling ScreensText for Auto-polling Screens Data Display String Format ± &XYYYYYZN FormatExample Hilimit Data Limits Format ± &L,X,YYYYY,LowLimit,Hilimit #,SC,BC,LT Colors/logtime setup format ± &#,SC,BC,LT Creating or Editing System Messages System Messages Specifying the Device to Control System Message Display Executing an Auto-polling Screen Auto-Polling During System Operation Forcing an Output Changing the DisplayPrinting the Screen Writing a Value to a Register Renaming the .LOG File to Prevent Overwriting Data Data LoggingHow Data Logging Works .LOG File Target ID Format of Logged DataTime Stamp Year, Month, Day, Hour, Minutes, Seconds Data Type Table, Reference, Data Value Error Writing to Device COM1 Error Messages During Operation Appendix ProgrammingApplications Application #1 Flip / Flop Toggle Operation Application #2 Power Up One Shot Start±up Protection Application #3 Cascading Counters Application #4 Industrial ªStarting Circuitº +±± ±±+±±/±±+±±±±±±±±±±+±±±±±±±+±±±±±±±+±± ±± Index Index-2 Index-3