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Advanced Function <strong>Instruction</strong>FUN 68RTSRETURN FROM SUBROUTINEFUN 68RTS• This instruction is used to represent the end of a subroutine. Therefore it can only appear within thesubroutine area. Its input side has no control signal, so there is no way to serially connect any contacts.This instruction is self sustain, and is directly connected to the power line.• When PLC encounter this instruction, it means that the execution of a subroutine is finished. Therefore it willreturn to the address immediately after the CALL instruction, which were previously executed and willcontinue to execute the program.• If this instruction encounters any of the three flow control instructions MC, SKP, or JMP, then this instructionmay not be executed (it will be regarded as not exist). If the above instructions are used in the subroutineand causing the subroutine not to execute the RTS instruction, then PLC will halt the operation and set theM1933( flow error flag) to 1. Therefore, no matter what the flow is going, it must always ensure that anysubroutine must be able to execute a matched RTS instruction.• For the usage of the RTS instruction please refer to instructions for the CALL instruction.7-51
Advanced Function <strong>Instruction</strong>FUN 69RTIRETURN FROM INTERRUPTFUN 69RTI• The function of this instruction is similar to RTS. Nevertheless, RTS is used to end the execution of subprogram, and RTI is used to end the execution of interrupt service program. Please refer to the explanationof RTS instruction.• A RTI instruction can be shared by more than one interrupt service program. The usage is the same as thesharing of an RTS by many subroutines. Please refer to the explanation of CALL instruction.• The difference between interrupts and call is that the sub program name (LBL) of a call is defined by user,and the label name and its call instruction are included in the main program or other sub program.Therefore, when PLC performs the CALL instruction and the input “EN”=1 or “EN↑” ( instruction)changes from 0→1, the PLC will call (execute) this sub program. For the execution of interrupt serviceprogram, it is directly used with hardware signals to interrupt CPU to pause the other less important works,and then to perform the interrupt service program corresponding to the hardware signal (we call it thecalling of interrupt service program). In comparing to the call instruction that need to be scanned toexecute, the interrupt is a more real time in response to the event of the outside world. In addition, theinterrupt service program cannot be called by label name; therefore we preserve the special “reservedwords” label name to correspond to the various interrupts offered by PLC (check FUN65 explanation fordetails). For example, the reserved word X0+I is assigned to the interrupt occurred at input point X0; aslong as the sub program contains the label of X0+I, when input point X0 interrupt is occurred (X0: ), thePLC will pause the other lower priority program and jump to the subroutine address which labeled as X0+Ito execute the program immediately.• If there is a interrupt occurred while CPU is handling the higher priority (such as hardware high speedcounter interrupt) or same priority interrupt program (please refer to Chapter 10 for priority levels), the PLCwill not execute the interrupt program for this interrupt until all the higher priority programs were finished.• If the RTI instruction cannot be reached and performed in the interrupt service routine, may cause a seriousCPU shut down. Consequently, no matter how you control the flow of program, it must be assured that theRTI instruction will be executed in any interrupt service program.• For the detailed explanation and example for the usage of interrupts, please refer to Chapter 10 forexplanation.7-52
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Conventional Ladder DiagramPLC Ladd
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Input processing (Reading thestatus
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We must energize the coil of relay
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Network: Network is a circuit repre
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1.5 The De-Composition of a Network
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• When a single element or a seri
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MEMO
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2.2 Digital and Register Allocation
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Relay No. Function Description3. Pu
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Relay No. Function DescriptionM1965
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2.4 Special Registers DetailsRegist
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Register No. Function DescriptionR4
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Register No. Function DescriptionD4
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Instruction Operand Symbol Function
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FUNNo.NameOperandDerivativeInstruct
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FUNNo.NameOperandDerivativeinstruct
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• Ramp Function InstructionsFUNNo
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MEMO
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※For the relays marked with a ‘
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FUN7 is the UDCTR function. While r
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X0X1Node ANode BIncerseInversediffe
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All input controls of the function
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• The names and functions of the
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5.1.4 Functions Output (FO)The “F
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Indirect addressing program example
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5.3.2 The Coding of Numeric Numbers
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(2). 0.5 = (-1) 0 * 2 ( 01111110 )
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While all FBs-PLC numerical operati
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Basic Function InstructionT TIMER T
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Basic Function InstructionT TIMER T
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Basic Function InstructionCCOUNTER(
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Basic Function InstructionSET D PSy
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Basic Function InstructionRST D PSy
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Basic Function InstructionFUN 0MCSy
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Basic Function InstructionFUN 1MCES
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Basic Function InstructionFUN 2SKPS
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Basic Function InstructionFUN 4DIFU
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Basic Function InstructionFUN 6 D P
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Basic Function InstructionFUN 7 DUD
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Basic Function InstructionFUN 9 D P
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Basic Function InstructionFUN 11 D
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Page 108 and 109: Advanced Function InstructionFUN22
Page 110 and 111: Advanced Function InstructionFUN 24
Page 118 and 119: Advanced Function InstructionFUN32A
Page 154 and 155: Advanced Function InstructionEND PR
Page 180 and 181: Advanced Function InstructionFUN89/
Page 190 and 191: Advanced Function InstructionTable
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Advanced Function InstructionFUN114
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Advanced Function InstructionFUN 13
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Advance Function InstructionFUN 208
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MEMO
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8.2 Basic Formation of Step Ladder
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. Single CycleM1924X0• When step
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●STP Sxxx : S20≦Sxxx≦S999(Dis
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【Description】: 1. When ON, the
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●STPEND :(Displayed in WinProladd
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Example 1WinProladderFP-07M1924STP
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Example 3WinProladderFP-07M1924STP
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WinProladderFP-07M1924STP S0X1X2X0S
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WinProladderM1924TO S0X1STP S0SET Y
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●Pedestrian Crossing Lights Contr
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8.6 Syntax Check Error Codes for St
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1.1 Profile112798716外徑 4ψ×4
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〝H〞 indicates hexadecimal↓
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1.5.2 FUN function description• F
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【Example】Assume definition as R
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• Locations and application of th
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1.7.2 The Information formats of me
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