Auxiliary Relays, Device Mnemonic M | Mitsubishi Electronics FX1S

FX Series Programmable Controllers

Devices in Detail 4

4.3Auxiliary Relays

FX1S

FX1N

FX2N

FX2NC

Device Mnemonic: M

Purpose: Internal programmable controller status flag

Alias: Auxiliary (coil/ relay/ contact/ flag)

M (coil/ relay/ contact /flag)

M (bit) device

Available forms: NO () and NC contacts and output coils () (see example device usage for references)

Devices numbered in: Decimal, i.e. M0 to M9, M10 to M19

Further uses: General stable state auxiliary relays - see page 4-3 Battery backed/ latched auxiliary relays - see page 4-4 Special diagnostic auxiliary relays - see page 4-5

Example device usage:

X0

M507

X1

M507

2

1

4.3.1General Stable State Auxiliary Relays

•A number of auxiliary relays are used in the PLC. The coils of these relays are driven by device contacts in the PLC in the same manner that the output relays are driven in the program.

All auxiliary relays have a number of electronic NO and NC contacts which can be used by the PLC as required. Note that these contacts cannot directly drive an external load. Only output relays can be used to do this.

Available devices:


	PLC	FX1S	FX1N	FX2N		FX2NC
	General auxiliary	384	384	500		500
	relays	(M0 - 383)	(M0 - 383)	(M0 - 499)		(M0 - 499)

	Battery backed/	128	1152	2572		2572
	Battery backed/	128	(M384 -	(M500	-	(M500	-
	latched relays	(M384 - 511)	(M384 -	(M500	-	(M500	-
	latched relays	(M384 - 511)	1535)	3071)		3071)
			1535)	3071)		3071)

	Total available	512	1536	3072		3072

• For more information about device availability for individual PLC’s, please see chapter 8.

4-3

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Mitsubishi Electronics FX1S manual Device Mnemonic M, General Stable State Auxiliary Relays

Contents

Programming Manual Page Foreword FX Series Programmable Controllers FX Series Programmable Controllers FAX Back Combined Programming Manual J FX Series Programmable Controllers Software Warnings Hardware 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 Overview Introduction What do You Need to Program a PLC? What is a Programmable Controller? Current Generation CPU all versions Special considerations for programming equipment Manual name Number FX Base Unit Hardware Assocciated Manuals Manual name Number FX DU, GOT and DM units Memo Basic Program Instructions FX Series Programmable ControllersBasic Program Instructions Detailed device information What is a Program?Outline of Basic Devices Used in Programming Example How to Read Ladder Logic Program example Load, Load InverseOUT instruction Out Timer and Counter Variations Double Coil Designation Use of dual coilsLast coil effect Peripheral limitations And, And Inverse ORI Or, Or Inverse Single Operation flags M2800 to M3071 Load Pulse, Load Trailing Pulse LDF ANF OUT Pulse, And Trailing Pulse ORF ORB Or Pulse, Or Trailing Pulse Sequential processing limitations Or BlockBatch processing limitations ANB Block MPS, MRD and MPP usage 13 MPS, MRD and MPP Multiple program examples MCR Master Control and Reset Nested MC program example Resetting timers and counters Set and Reset 16.1Basic Timers, Retentive Timers And Counters Timer, Counter Out & ResetRetentive timers Availability of devices Bit countersNormal 32 bit Counters High Speed Counters Leading and Trailing Pulse PLF Usages for INV Inverse No Operation No Operation Program scan 20 End Memo STL Programming FX Series Programmable ControllersSTL Programming General note What is STL, SFC And IEC1131 Part 3? Look Inside an STL How STL OperatesEach step is a program Combined SFC Ladder representation How To Start And End An STL ProgramEmbedded STL programs Activating new states Returning to Standard Ladder Initial StepsTerminating an STL Program Moving Between STL Steps Using SET to drive an STL coil Out is used for distant jumps Using OUT to drive an STL coilOUT is used for loops and jumps Basic Notes On The Behavior Of STL programs Rules and Techniques For STL programs T001 K20 K50 Method 2 Special Single Pulse Flags Single Signal Step ControlMethod 1 Using locking devices Restrictions on using applied instructions Restrictions Of Some Instructions When Used With STLUsing ‘jump’ operations with STL STL OUT SET Using STL To Select The Most Appropriate Program Limits on the number of branches Using STL To Activate Multiple Flows Simultaneously Limits on the number of branches Instruction Format General Rules For Successful STL Branching General Precautions When Using The FX-PCS/AT-EE Software Simple STL Flow Programming Examples SET STL Identification of normally closed contacts Selective Branch/ First State Merge Example Program Points to note Full STL flow diagram/program Advanced STL Use Devices in Detail FX Series Programmable ControllersDevices in Detail Inputs Configuration detailsAvailable devices Device Mnemonic Alias O/P OutputsDevice Mnemonic Y General Stable State Auxiliary Relays Auxiliary RelaysDevice Mnemonic M External loads Battery Backed/ Latched Auxiliary Relays Special Single Operation Pulse Relays Special Diagnostic Auxiliary Relays General Stable State State Relays State RelaysDevice Mnemonic S PLC FX 1S FX 1N FX 2N Battery Backed/ Latched State Relays Monitoring STL programs Assigned statesSTL/SFC programming IST instruction Annunciator Flags Jumping to the end of the program PointersDevice availability Device Mnemonic P Additional applied instructions Interrupt PointersNested levels Pointer position Input Interrupts Timer InterruptsRules of use Disabling high speed counter interrupts Driving special auxiliary relaysAdditional notes Disabling Individual Interrupts Constant H Constant KDevice Mnemonic K Example device usage N/A Device Mnemonic T TimersTimer accuracy Driving special auxiliary coils General timer operationSelectable Timers Retentive Timers Using timers in interrupt or ‘CALL’ subroutines Timers Used in Interrupt and ‘CALL’ Subroutines Internal timer accuracyTimer Accuracy Condition Counters Setting ranges for countersHigh speed counters Device Mnemonic C General/ Latched 16bit UP Counters Battery backed/latched counters General/ Latched 32bit Bi-directional Counters Battery backed/ latched countersSelecting the counting direction Further uses None Basic high speed counter operation Basic High Speed Counter Operation Driving high speed counter coils Availability of High Speed Counters Input assignmentCounter Speeds Calculating the maximum combined counting speed on FX1S Setting range Device specificationDirection setting Using the SPD instruction RST Device size 11.5 2 Phase Bi-directional Counters C246 to C250 11.6 A/B Phase Counters C252 to C255 Example device usage None Data RegistersDevice Mnemonic D General Use Registers Data register updatesData retention Use of diagnostic registers Using the FX2-40AW/APBattery Backed/ Latched Registers Special Diagnostic Registers Writing to file registers Special caution when using FX1SFile Registers Program memory registers Uses Externally Adjusted Registers Use of Modifiers with Applied Instruction Parameters Index RegistersDevice Mnemonic V,Z Available forms Misuse of the Modifiers Using Multiple Index RegistersModifying a Constant Bit Devices, Individual and Grouped Bits, Words, BCD and Hexadecimal Assigning grouped bit devices Moving grouped bit devicesAssigning I/O Interpreting Word Data Word Devices FX Series Programmable Controllers Word Data Summary Binary Coded Decimal value= Error Inverted7 Additional1 14.4 Two’s Compliment Some useful constants Floating Point And Scientific Notation Scientific Notation Floating Point Format FLT