(1) downtime must be two or more people care operations; (2) The front panel of the CPU mode selector switch from "Run" to "stop" position; (3) off the main power supply of the PLC, and then close the other to die Sakamoto power supply; (4) The power supply shelf connected to the power line wire number and remember … Continue reading Omron PLC equipment disassembly sequence and method
Tag: PLC programming
Initialization module (OB100) – Siemens S7-300PLC organization block OB
When the CPU state into the stop state operating mode, the operating system calls OB100. After the end of OB100 operation, operating system calls OB1. Use OB100 characteristics prior to execution of OB1, you can prepare the initial variables or parameters for the user to run the main program.
Hardware interrupt (OB40) – Siemens S7-300PLC organization block OB
Response process from different modules (eg I / O modules, CP or FM module module) issued a warning or a hardware interrupt request signal.OB 40 runs, the operating system does not receive the other hardware interrupt requests.You can modify the parameters for analog or digital module with a programming tool which is set by the … Continue reading Hardware interrupt (OB40) – Siemens S7-300PLC organization block OB
Cyclic interrupt (OB 35) – Siemens S7-300PLC organization block OB
Set or modify the interval (default is 100ms) from the programming tool. Ranging from lms ~ lmin. When allowed to interrupt the cycle, OB35 cycle run at regular intervals. When OB1 OB35 run to set time, OB 35 is executed again. When using OB 35 properties, should ensure that the value of the interval is set longer than … Continue reading Cyclic interrupt (OB 35) – Siemens S7-300PLC organization block OB
Delay interrupt OB 20- Siemens S7-300 PLC organization block OB
By calling the SFC 32 starts. SFC 32 o'clock to provide arguments is called.OB-NR delay interrupt OB numbersDTIME delay length (1 to 60000ms)SIGN extended into OB OB called startup information signsRET-VAL OB the error code if an error occurs during the execution ofDelay interrupts SFCSFC32 SRT_TINT start delay interruptsSFC33 CAN_DINT cancel delay interruptsSFC34 QRY_TINT query … Continue reading Delay interrupt OB 20- Siemens S7-300 PLC organization block OB
Day interrupt (OB10) – Siemens S7-300 PLC organization block OB
OB10 can be run according to the following intervals:Once (once): only once at a specific date and time.Every minute: starting from a specific date and time, once per minute.Hourly: starting from a specific date and time, once per hour.Daily: starting from a specific date and time, once a day.Weekly: starting from a specific date and … Continue reading Day interrupt (OB10) – Siemens S7-300 PLC organization block OB
Interrupt process Siemens S7-300 PLC tissue piece OB
When the system detects a OB interrupted, was interrupted block of accumulators and current information on the register will be used as an interrupt stack aside (I stack).I-content from the stack are:F-contents of the accumulator and address registers;The contents of f-block registers;F-local data stack, status word, MCR and b of the register stack pointer.If the … Continue reading Interrupt process Siemens S7-300 PLC tissue piece OB
Siemens PLC byte immediately read instruction MOV-BIR
Bytes read instruction immediately (MOV-BIR) reads the actual input IN the 1-byte values, and write OUT the result as the specified storage unit, but the input image register has not been updated.Bytes write command immediately read from the input IN the specified storage unit 1 byte numerical and written (in bytes) of physical output point … Continue reading Siemens PLC byte immediately read instruction MOV-BIR
Siemens PLC byte swap instruction
Byte switch command is used to switch the input word IN the highest and lowest bytes ENO = 0 error condition:0006 (indirect addressing error),SM4.3 (run-time)Results of the program:Before instruction execution VW50 the word: D6 C3After the instruction execution VW50 word: C3 D6
Siemens S7 series PLC transfer instructions
FBDTerminal Description: EN--allows inputsIN--source data inputPurpose OUT--output operandsENO--allows the output side Statement List: A I 0.0 JNB _0001 L MW 10 T DBW 12 SET // make RLO 1 SAVE // make BR 1 CLR _0001: A BR = Q 4.0
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