LG Electronics 120S

Chapter 8 Communication Functions

8-44

• Frame size

- ASCII communication : max. 128 bytes

- Hex communication : max. 256 bytes

• Link relay (L)

- It’s a flag to indicate whether a user defined frame is received in the order set by the user.

- If the received frame is matched with the declared frame in frame list number 3, L003 starts blinking

(0 → 1 → 0).

• When frame receiving is done, MASTER-K120S main unit check if there’s any match between the received frame

and the declared frame in frame list. If there is, let the Link relay L(n) flag blink and save the received data in the

assigned area.

BCC calculation example> When frame is set as below, the result of calculation is as follow.

(1) Default setting

Contents

Main Users Manual MASTER-K 120S series WARNING CAUTION Page SAFETY INSTRUCTIONS Installation Precautions SAFETY INSTRUCTIONS Wiring Precautions SAFETY INSTRUCTIONS Startup and Maintenance Precautions Disposal Precaution Revision History Contents Page Page Page Page Chapter 1. General 1.1 Guide to Use This Manual Page 1.3 Terminology Page Chapter 2 System Configuration Chapter 2. System Configuration 2.1.1 Basic system Page Page Chapter 2 System Configuration CPU Chapter 2 System Configuration 2.2.2 K120S Series System Equipment Product 1) Main Unit Standard type 2) Main Unit Economic type 3) Expansion Modules Chapter 3 General Specifications Chapter 3. General Specifications 3.1 General Specifications Chapter 4. Names of Parts 4.1 Main Unit Page Page Page Page Page Page Chapter 4 Names of Parts 4.2 Expansion I/O Module Page Chapter 4 Names of Parts 4.3 Special Module 4.3.1 A/DD/A Combination Module Page Page Chapter 4 Names of Parts 4.4 Communication I/F Module Chapter 4 Names of Parts 4.5 Option Module Chapter 5 Power Supply / CPU Chapter 5. Power Supply / CPU 5.1 Power Supply Specifications Chapter 5 Power Supply / CPU 5.2 CPU Specifications Page Page Page Chapter 5 Power Supply / CPU 5.3 Operation Processing 5.3.1 Operation Processing Method 1) Cyclic operation Chapter 5 Power Supply / CPU 2) Interrupt operation method 5.3.2 Operation Processing at Momentary Power Failure Occurrence 1) Momentary power failure within 10 ms 2) Momentary power failure exceeding 10 ms Chapter 5 Power Supply / CPU 5.3.3 Scan Time 1) Expression for scan time 2) Flags Chapter 5 Power Supply / CPU 5.3.5 Timer Processing 1) On delay timer 2) Off delay timer 3) Integral timer 5) Retriggerable timer Chapter 5 Power Supply / CPU 5.3.6 Counter Processing 1) Up counter (CTU) 2) Down counter (CTD) 3) Up-down counter 4) Ring counter 5) Maximum counting speed t times/sec)( 1 100 5.4 Program 5.4.1 Classifications of Program 5.4.2 Program Execution Procedure Chapter 5 Power Supply / CPU 1) Scan program 2) Interrupt program 5.4.3 Interrupt Programs 1) Usage of interrupt program Page Chapter 5 Power Supply / CPU 5.4.4 Error Handling 1) Error Classification 2) Operation mode at error occurrence Page Chapter 5 Power Supply / CPU 5.5 Operation Modes 5.5.1 RUN Mode 1) Processing when the operation mode is changed. 2) Operation processing contents Chapter 5 Power Supply / CPU 5.5.2 STOP mode 1) Processing when the operation mode is changed. 2) Operation processing contents 5.5.3 PAUSE mode Chapter 5 Power Supply / CPU 3) Debug operation conditions 4) Operation method 5.5.5 Operation Mode Change 1) Operation mode change methods 3) Mode change Remote operation 5.6 Functions Page Page 2) Special data register for forced I/O 3) Force on/ off Processing timing and method Chapter 5 Power Supply / CPU 5.6.3 Direct I/O Operation function 5.6.4 System error history 1) Special data register for error history 2) Description of each word 5.7 Memory Configuration 5.8 I/O Address Allocation 1) I/O No. allocation method Chapter 5 Power Supply / CPU 5.9 Built-in Cnet Selection Switch 5.9.1 Structure 5.9.2 Usage Page Chapter 5 Power Supply / CPU 5.10 External Memory Module 5.10.1 Structure 5.10.2 Usage 1) Saving the users program on the external memory module. 2) Run the PLC with a program of external memory module Chapter 5 Power Supply / CPU 5.11 RTC Module 5.11.1 Structure 5.11.2 Usage 1) Read RTC data 2) Write RTC data 3) Date expression 6.1 Input / Output Specifications AC 125V r/load DC 30V r/load AC 250V r/load Chapter 6 Input and Output Specification 6.2 Digital Input Specification 6.2.1 Main unit 1) Specification 2) Circuit diagram 3) Input wiring 4) Example of external devices. Chapter 6 Input and Output Specification 6.2.2 Expansion Module 1) Specifications 2) Circuit diagram 3) Input wiring 6.3 Digital Output Specification 6.3.1 Main unit (Relay Output) 2) Circuit 3) Output wiring Chapter 6 Input and Output Specification 6.3.2 Main unit (TR Output : DRT/DT type only) 2) Output wiring Chapter 6 Input and Output Specification 6.3.3 Expansion Module 1) Specifications 2) Circuit Page Chapter 7 Usage of Various Functions Chapter 7. Usage of Various Functions 7.1 Built-in Functions 7.1.1 High-speed counter function 1) Performance Specifications Page Page 6) Wiring example Pulse Generator CHSC Pulse Generator CHSC 7) Instruction(HSCST) 8) Parameter Setting Page Page Page Page Page 9) Programming example Page Chapter 7 Usage of Various Functions 7.1.2. Pulse Catch Function 1) Usage 2) Minimum input pulse width. Page Chapter 7 Usage of Various Functions 7.1.3 Input Filter Function 1) Usage 2) Operating Explanation 3) Using method Chapter 7 Usage of Various Functions 7.1.4 External Interrupt Function 1) Usage 2) Minimum processing time. 3) Operating explanation 5) Usage Chapter 7 Usage of Various Functions 7.1.5 PID control function(Standard type only) 1) Introduction 2) Specification [] PVSVKpMV = where, Kp : the proportional constant (gain), SV: set value, PV: present value =Edt Ti Kp MV Page dE TdKpMV = Page [] Page Page Page Page Chapter 7 Usage of Various Functions Ts e K 5) instruction Page 6) Program Example Page Page Page Page 6) Error code list 7-39 Remark 7. 2 Special module The special module and allocated data registers are as followings. RTD input module store digital conversion value of temperature value to data registers as below 1 ) Chapter 7 Usage of Various Functions 7.2.1 A/DD/A Combination module Page Page Page Chapter 7 Usage of Various Functions 4) Wiring + 5) I/O converstion characteristics Page 6) Program example Page Chapter 7 Usage of Various Functions 7.2.2 A/D Conversion module 1) Performance specifications 7-50 The Names of parts and functions of the analog input module are following. No Contents 3) Parameter setting 4) Wiring 5) Analog/Digital conversion characteristics 6) Program example Page Chapter 7 Usage of Various Functions 7.2.3 D/A Conversion module 1) Performance specifications Chapter 7 Usage of Various Functions 7-56 G7F DA2I G7F DA2V Page 5) Scaling function 6) Wiring 7) Digital/Analog conversion characteristics 8) Program example Chapter 7 Usage of Various Functions 7.2.4 Analog timer 1) Performance specification 3) Program example Chapter 7 Usage of Various Functions 7.2.5 RTD input module(Standard type only) 3) Parameter setting 4) Digital conversion value register 5) Error code ( D4880D4885 ) 6) Temperature conversion characteristics 8) Burn-out detection function 9) Wiring 10) Program example Chapter 7 Usage of Various Functions 7.3 Positioning Function(DRT/DT type only) 7.3.1 Specification 2) Output Specification(P40, P41) 3) Names of wiring terminal Page Chapter 7 Usage of Various Functions 1) Positioning function (2) Speed Control (Uniform Speed Operation) 2) Operation pattern 3) Operation Mode Page Page 4) Operation Method 5) Positioning start 6) Positioning stop 7) Return to Origin(POSORG : Rising edge ) (2) Origin Detection when Approximate origin turns off Page 9) Speed Override Command(POSSOR : Rising edge )) 10) External Input Stroke High/Low Limit 12) Error and Output Prohibition Chapter 7 Usage of Various Functions 7.3.3 Positioning parameter and operation data 1) Positioning parameter (2) Origin return parameter rigin return-Low speed 2) Positioning parameter Page Page Chapter 7 Usage of Various Functions 1) Positioning Indirect start(POSIST) 2) JOG Operation(POSJOG) 3) Positioning Control Instruction(POSCTR) 4) Current position preset (POSPRS) 5) PWM output (PWM) 6) Speed control operation (POSVEL) 7) Speed override (POSSOR) 8) Positioning direct start(POSDST) 9) Return to origin(POSORG) Chapter 7 Usage of Various Functions 7-100 7.3.5 Flag list and Error codes 1) Flag list Device Function Description Page 2) Error code Page Chapter 7 Usage of Various Functions 7-104 Remark 7.3.6 Wiring with servo and stepping motor driver (Open Collector) 3) Wiring with servo motor driver(MR-J2/J2S-A) * 3 K7M-DRT**U * 3 4) Wiring with Servo motor driver(FDA-5000 AC Servo Driver) Chapter 8 Communication Functions Chapter 8. Communication Functions 8.1 Dedicated Protocol Communication 8.1.1 Introduction Chapter 8 Communication Functions 8.1.2 System configuration method 1) Connecting system configuration (link between MASTER-Ks) Page Page Chapter 8 Communication Functions 8.1.3 Frame Structure 1) Base Format 2) Sequence of command frame Chapter 8 Communication Functions 8.1.4 List of commands Chapter 8 Communication Functions 8.1.5 Data type 1) Data type of variable Chapter 8 Communication Functions 8.1.6 Execution of commands 1) Individual reading of device(R(r)SS) Page Page 2) Continuous reading(R(r)SB) of device Page Page 3) Individual writing of device(W(w)SS) Page Page 4) Continuous writing of device(W(w)SB) Page Page 5) Monitor register(X##) Page Page 6) Monitor execution(Y##) Page Chapter 8 Communication Functions 7) Reading PLC Status(RST) Page 8.1.7 1:1, 1:n Built-in communication between MASTER-K120S's 1) Introduction 2) Parameter setting Page Page 3) Flag related with operating status Page 4) Example Page Page Page Chapter 8 Communication Functions 8-38 8.1.8 Error code Error code Error type Error condition and causes Treatment 8.2 User Defined Protocol Communication 8.2.2 Parameter Setting Page Page Page Page Page Page Page Chapter 8 Communication Functions 8.2.3 Instruction 1) User defined communication instruction(SNDCOM) Chapter 8 Communication Functions 3) Error code 8.2.4 Example of Usage 1) The Programming and setting communication parameter of the master station Page Page Page 2) Setting and program of slave station Page Page Page Page Chapter 8 Communication Functions 8.3 Modbus Protocol Communication 8.3.2 Basic Specification 1) ASCII mode 2) RTU mode 3) Address area 4) Function code area 5) Data area 6) LRC Check/CRC Check area Page Chapter 8 Communication Functions 10) Map of wiring Page Chapter 8 Communication Functions 1) MODBUS communication instruction(MODCOM) Page 2) Example program 1 3) Example program 2 4) Example program 3 5) Example program 4 8.4 No Protocol Communication 1) Sending Data 2) Receiving Data Page Chapter 8 Communication Functions 8.4.3 Instructions Chapter 8 Communication Functions 8.4.4 Examples Page 8.5 Remote connection and communication I/F module 1) Remote connection by built-in Cnet I/F 2) Remote connection by modem Page 8.5.2 Communication I/F module Page Page Chapter 9 Installation and Wiring 9.1 Installation 9.1.1 Installation Environment 1) Environment requirements 2) Precautions during installing 3) Heat protection design of control box Chapter 9 Installation and Wiring ) Power consumption block diagram of PLC systems 5) Power consumption of each part Main Unit Expansion module Chapter 9 Installation and Wiring 9.1.2 Handling Instructions 1) Main unit or Expansion Module handling instructions 2) Mounting instructions Page Chapter 9 Installation and Wiring 9.1.3 Connection of expansion module 9.2 Wiring 9.2.1 Power Supply Wiring Chapter 9 Installation and Wiring Input Chapter 9 Installation and Wiring 9.2.3 Grounding 9.2.4 Cable Specifications for wiring Chapter 10 Maintenance Chapter 10 Maintenance 10.1 Maintenance and Inspection 10.2 Daily Inspection Chapter 10 Maintenance 10-2 10.3 Periodic Inspection Chapter 11 Troubleshooting 11.1 Basic Procedures of Troubleshooting 11.2 Troubleshooting Chapter 11 Troubleshooting 11.2.1 Troubleshooting flowchart used when the POWER LED turns OFF. Yes No No No Chapter 11 Troubleshooting 11.2.2 Troubleshooting flowchart used when the ERR LED is flickering Chapter 11 Troubleshooting 11.2.3 Troubleshooting flowchart used when the RUN LED turns off. Chapter 11 Troubleshooting 11.2.4 Troubleshooting flowchart used when the I/O part doesnt operate normally. Page Chapter 11 Troubleshooting 11.2.5 Troubleshooting flowchart used when a program cannot be written to the CPU part 11.3 Troubleshooting Questionnaire Chapter 11 Troubleshooting 11.4 Troubleshooting Examples 11.4.1 Input circuit troubles and corrective actions Chapter 11 Troubleshooting 11-10 11.4.2 Output circuit troubles and corrective actions Page 11-12 11.5 Error code list 11-13 (continued) Appendix 1. System Definitions Page Page 2) Basic Parameters Appendix 2. Flag List Page 2) Internal relay (M) App2-4 3) Data relay (D) (1) When FNET module is connected Relay Keyword Function Description App2-5 (2) When communication mode is dedicated master mode (Channel 0) Relay Function Relay Function App2-6 (3) When communication mode is dedicated master mode (Channel 1) Relay Function Relay Function App2-7 I/O Forced I/O designation register Forced I/O data register Page Appendix 3 External Dimensions Appendix 3 External Dimensions (unit: mm) 1) Main unit 2) Extension module