Battery backed/latched counters | Mitsubishi Electronics FX1S

FX Series Programmable Controllers

Devices in Detail 4

4.10.1 General/ Latched 16bit UP Counters

The current value of the counter increases

each time coil C0 is turned ON by X11. The

output contact is activated when the coil is

turned ON for the tenth time (see diagram).

After this, the counter data remains unchanged

when X11 is turned ON. The counter current

value is reset to ‘0’ (zero) when the RST

instruction is executed by turning ON X10 in

the example. The output contact Y0 is also

reset at the same time.

X10

RST C0 X11

C0

C0K10

Y0

Counters can be set directly using constant K

or indirectly by using data stored in a data

register (ex. D). In an indirect setting, the

designation of D10 for example, which

contains the value “123” has the same effect

as a setting of “K123”.

If a value greater than the counter setting is

written to a current value register, the counter

counts up when the next input is turned ON.

This is true for all types of counters.

Generally, the count input frequency should be

around several cycles per second.

X10

X11

0

Y0

1

2

3

4

5

6

7

8

9 10

Battery backed/latched counters:

• Counters which are battery backed/ latched are able to retain their status information, even after the PLC has been powered down. This means on re-powering up, the latched counters can immediately resume from where they were at the time of the original PLC power down.

Available devices:

• Please see the information table on page 4-19.

4-20

Image 94

Mitsubishi Electronics FX1S manual Battery backed/latched counters, General/ Latched 16bit UP Counters

Contents

Programming Manual Page FX Series Programmable Controllers Foreword FX Series Programmable Controllers FAX Back Combined Programming Manual J FX Series Programmable Controllers Hardware Warnings Software Warnings FX 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 Overview What is a Programmable Controller? What do You Need to Program a PLC? Special considerations for programming equipment Current Generation CPU all versions Assocciated Manuals Manual name Number FX Base Unit Hardware Manual name Number FX DU, GOT and DM units Memo Basic Program Instructions FX Series Programmable ControllersBasic Program Instructions Outline of Basic Devices Used in Programming What is a Program?Detailed device information How to Read Ladder Logic Example OUT instruction Load, Load InverseProgram example Timer and Counter Variations Out Last coil effect Use of dual coilsDouble Coil Designation And, And Inverse Peripheral limitations Or, Or Inverse ORI Load Pulse, Load Trailing Pulse Single Operation flags M2800 to M3071 Pulse, And Trailing Pulse LDF ANF OUT Or Pulse, Or Trailing Pulse ORF ORB Batch processing limitations Or BlockSequential processing limitations Block ANB 13 MPS, MRD and MPP MPS, MRD and MPP usage Multiple program examples Master Control and Reset MCR Nested MC program example Set and Reset Resetting timers and counters Retentive timers Timer, Counter Out & Reset16.1Basic Timers, Retentive Timers And Counters Normal 32 bit Counters Bit countersAvailability of devices High Speed Counters PLF Leading and Trailing Pulse Inverse Usages for INV No Operation No Operation 20 End Program scan Memo STL Programming FX Series Programmable ControllersSTL Programming What is STL, SFC And IEC1131 Part 3? General note Each step is a program How STL OperatesLook Inside an STL Embedded STL programs How To Start And End An STL ProgramCombined SFC Ladder representation Activating new states Terminating an STL Program Initial StepsReturning to Standard Ladder Using SET to drive an STL coil Moving Between STL Steps OUT is used for loops and jumps Using OUT to drive an STL coilOut is used for distant jumps Rules and Techniques For STL programs Basic Notes On The Behavior Of STL programs T001 K20 K50 Method 1 Using locking devices Single Signal Step ControlMethod 2 Special Single Pulse Flags Using ‘jump’ operations with STL Restrictions Of Some Instructions When Used With STLRestrictions on using applied instructions Using STL To Select The Most Appropriate Program STL OUT SET Using STL To Activate Multiple Flows Simultaneously Limits on the number of branches Limits on the number of branches General Rules For Successful STL Branching Instruction Format General Precautions When Using The FX-PCS/AT-EE Software Programming Examples Simple STL Flow Identification of normally closed contacts SET STL Points to note Selective Branch/ First State Merge Example Program Full STL flow diagram/program Advanced STL Use Devices in Detail FX Series Programmable ControllersDevices in Detail Available devices Configuration detailsInputs Device Mnemonic Device Mnemonic Y OutputsAlias O/P Device Mnemonic M Auxiliary RelaysGeneral Stable State Auxiliary Relays Battery Backed/ Latched Auxiliary Relays External loads Special Diagnostic Auxiliary Relays Special Single Operation Pulse Relays Device Mnemonic S State RelaysGeneral Stable State State Relays Battery Backed/ Latched State Relays PLC FX 1S FX 1N FX 2N STL/SFC programming Assigned statesMonitoring STL programs IST instruction Annunciator Flags Device availability PointersJumping to the end of the program Device Mnemonic P Nested levels Interrupt PointersAdditional applied instructions Pointer position Rules of use Timer InterruptsInput Interrupts Additional notes Driving special auxiliary relaysDisabling high speed counter interrupts Disabling Individual Interrupts Device Mnemonic K Constant KConstant H Example device usage N/A Timer accuracy TimersDevice Mnemonic T Selectable Timers General timer operationDriving special auxiliary coils Using timers in interrupt or ‘CALL’ subroutines Retentive Timers Timer Accuracy Internal timer accuracyTimers Used in Interrupt and ‘CALL’ Subroutines Condition High speed counters Setting ranges for countersCounters Device Mnemonic C Battery backed/latched counters General/ Latched 16bit UP Counters Selecting the counting direction Battery backed/ latched countersGeneral/ Latched 32bit Bi-directional Counters Basic high speed counter operation Further uses None Driving high speed counter coils Basic High Speed Counter Operation Counter Speeds Input assignmentAvailability of High Speed Counters Calculating the maximum combined counting speed on FX1S Direction setting Device specificationSetting range Using the SPD instruction RST 11.5 2 Phase Bi-directional Counters C246 to C250 Device size 11.6 A/B Phase Counters C252 to C255 Device Mnemonic D Data RegistersExample device usage None Data retention Data register updatesGeneral Use Registers Battery Backed/ Latched Registers Using the FX2-40AW/APUse of diagnostic registers Special Diagnostic Registers File Registers Special caution when using FX1SWriting to file registers Program memory registers Externally Adjusted Registers Uses Device Mnemonic V,Z Index RegistersUse of Modifiers with Applied Instruction Parameters Available forms Modifying a Constant Using Multiple Index RegistersMisuse of the Modifiers Bits, Words, BCD and Hexadecimal Bit Devices, Individual and Grouped Assigning I/O Moving grouped bit devicesAssigning grouped bit devices Word Devices Interpreting Word Data FX Series Programmable Controllers Binary Coded Decimal value= Error Word Data Summary 14.4 Two’s Compliment Inverted7 Additional1 Floating Point And Scientific Notation Some useful constants Scientific Notation Floating Point Format FLT