Mitsubishi Electronics FX1S manual Device size, 11.5 2 Phase Bi-directional Counters C246 to C250

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C250

K1234

FX Series Programmable Controllers

Devices in Detail 4

4.11.52 Phase Bi-directional Counters (C246 to C250)

These counters have one input for counting up and one input for counting down. Certain counters also have reset and start inputs as well.

When X10 is ON, C246 resets in the same
When X10 is ON, C246 resets in the same
way as standard 32bit counters.			X10
way as standard 32bit counters.

Counter C246 uses inputs;						RST		C246
Counter C246 uses inputs;						RST		C246
X0 to count up and			X11
X1 to count down								C246
X1 to count down								C246
For any counting to take place the drive input								D2
								D2

X11 must be ON to set and reserve the
X11 must be ON to set and reserve the
assigned inputs for the attached counter, i.e. C246.
Note:

X0 moving from OFF to ON will increment C246 by one

X1 moving from ON to OFF will decrement C246 by one

Bi-directional counter C250 can be seen to have X5 as its reset input and X7 as its start

input. Therefore, a reset operation can be X13 made externally without the need for the RST

C250 instruction.

X13 must be ON to select C250. But start

input X7 must be ON to allow C250 to actually count. If X7 goes OFF counting ceases. Counter C250 uses input X3 to count up and input X4 to count down.

Device size:

• All of these counters have 32bit operation.

Setting range:

• -2,147,483,648 to +2,147,483,647

Direction setting:

•The counting direction for 1 phase counters is dependent on their corresponding flag M8✰✰✰; where ✰✰✰ is the number of the corresponding counter, (C241 to C245).

-When M8✰✰✰ is ON the counter counts down,

-When M8✰✰✰ is OFF the counter counts up.

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Contents Programming Manual Page FX Series Programmable Controllers ForewordFX Series Programmable Controllers FAX Back Combined Programming Manual J FX Series Programmable Controllers Hardware Warnings Software WarningsFX Series Programmable Controllers Contents STL Programming Applied Instructions Rotation And Shift Functions 30 to External FX Serial Devices Functions 80 to Execution Times And Instructional 10-1 Viii FX Series Programmable Controllers Chapter Contents Introduction OverviewWhat is a Programmable Controller? What do You Need to Program a PLC?Special considerations for programming equipment Current Generation CPU all versionsAssocciated Manuals Manual name Number FX Base Unit HardwareManual name Number FX DU, GOT and DM units Memo Basic Program Instructions FX Series Programmable ControllersBasic Program Instructions What is a Program? Outline of Basic Devices Used in ProgrammingDetailed device information How to Read Ladder Logic ExampleLoad, Load Inverse OUT instructionProgram example Timer and Counter Variations OutUse of dual coils Last coil effectDouble Coil Designation And, And Inverse Peripheral limitationsOr, Or Inverse ORILoad Pulse, Load Trailing Pulse Single Operation flags M2800 to M3071Pulse, And Trailing Pulse LDF ANF OUTOr Pulse, Or Trailing Pulse ORF ORBOr Block Batch processing limitationsSequential processing limitations Block ANB13 MPS, MRD and MPP MPS, MRD and MPP usageMultiple program examples Master Control and Reset MCRNested MC program example Set and Reset Resetting timers and countersTimer, Counter Out & Reset Retentive timers16.1Basic Timers, Retentive Timers And Counters Normal 32 bit Counters Bit countersAvailability of devices High Speed CountersPLF Leading and Trailing PulseInverse Usages for INVNo Operation No Operation20 End Program scanMemo STL Programming FX Series Programmable ControllersSTL Programming What is STL, SFC And IEC1131 Part 3? General noteHow STL Operates Each step is a programLook Inside an STL Embedded STL programs How To Start And End An STL ProgramCombined SFC Ladder representation Activating new statesInitial Steps Terminating an STL ProgramReturning to Standard Ladder Using SET to drive an STL coil Moving Between STL StepsUsing OUT to drive an STL coil OUT is used for loops and jumpsOut is used for distant jumps Rules and Techniques For STL programs Basic Notes On The Behavior Of STL programsT001 K20 K50 Single Signal Step Control Method 1 Using locking devicesMethod 2 Special Single Pulse Flags Restrictions Of Some Instructions When Used With STL Using ‘jump’ operations with STLRestrictions on using applied instructions Using STL To Select The Most Appropriate Program STL OUT SETUsing STL To Activate Multiple Flows Simultaneously Limits on the number of branchesLimits on the number of branches General Rules For Successful STL Branching Instruction FormatGeneral Precautions When Using The FX-PCS/AT-EE Software Programming Examples Simple STL FlowIdentification of normally closed contacts SET STLPoints to note Selective Branch/ First State Merge Example ProgramFull STL flow diagram/program Advanced STL Use Devices in Detail FX Series Programmable ControllersDevices in Detail Available devices Configuration detailsInputs Device MnemonicOutputs Device Mnemonic YAlias O/P Auxiliary Relays Device Mnemonic MGeneral Stable State Auxiliary Relays Battery Backed/ Latched Auxiliary Relays External loadsSpecial Diagnostic Auxiliary Relays Special Single Operation Pulse RelaysState Relays Device Mnemonic SGeneral Stable State State Relays Battery Backed/ Latched State Relays PLC FX 1S FX 1N FX 2NSTL/SFC programming Assigned statesMonitoring STL programs IST instructionAnnunciator Flags Device availability PointersJumping to the end of the program Device Mnemonic PNested levels Interrupt PointersAdditional applied instructions Pointer positionTimer Interrupts Rules of useInput Interrupts Additional notes Driving special auxiliary relaysDisabling high speed counter interrupts Disabling Individual InterruptsDevice Mnemonic K Constant KConstant H Example device usage N/ATimers Timer accuracyDevice Mnemonic T General timer operation Selectable TimersDriving special auxiliary coils Using timers in interrupt or ‘CALL’ subroutines Retentive TimersTimer Accuracy Internal timer accuracyTimers Used in Interrupt and ‘CALL’ Subroutines ConditionHigh speed counters Setting ranges for countersCounters Device Mnemonic CBattery backed/latched counters General/ Latched 16bit UP CountersBattery backed/ latched counters Selecting the counting directionGeneral/ Latched 32bit Bi-directional Counters Basic high speed counter operation Further uses NoneDriving high speed counter coils Basic High Speed Counter OperationInput assignment Counter SpeedsAvailability of High Speed Counters Calculating the maximum combined counting speed on FX1S Direction setting Device specificationSetting range Using the SPD instructionRST 11.5 2 Phase Bi-directional Counters C246 to C250 Device size11.6 A/B Phase Counters C252 to C255 Data Registers Device Mnemonic DExample device usage None Data register updates Data retentionGeneral Use Registers Battery Backed/ Latched Registers Using the FX2-40AW/APUse of diagnostic registers Special Diagnostic RegistersFile Registers Special caution when using FX1SWriting to file registers Program memory registersExternally Adjusted Registers UsesDevice Mnemonic V,Z Index RegistersUse of Modifiers with Applied Instruction Parameters Available formsUsing Multiple Index Registers Modifying a ConstantMisuse of the Modifiers Bits, Words, BCD and Hexadecimal Bit Devices, Individual and GroupedMoving grouped bit devices Assigning I/OAssigning grouped bit devices Word Devices Interpreting Word DataFX Series Programmable Controllers Binary Coded Decimal value= Error Word Data Summary14.4 Two’s Compliment Inverted7 Additional1Floating Point And Scientific Notation Some useful constantsScientific Notation Floating Point Format FLT