High-speed counter for frequencies above scan cycle external signals are counted, using a dedicated high-speed counter terminals of the host to receive these high-speed signals. High-speed counter is a high-speed event counting, it is independent of the CPU scan, the data for the current value of high-speed 32-bit signed calculator.Format: HC [high-speed counter number] For … Continue reading Siemens S7 200 PLC high-speed counter (HC)
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S7-200 series PLC compare instruction
SIEMENS S7-200 programming software in the STEP-7, a special compare instruction: IN1 and IN2 to compare the two data types can be B, I (W), D, R, that is, byte, word, integer, double word integers and real numbers; you can also have other comparative:>, <, ≥, ≤, , and so on. When the comparison … Continue reading S7-200 series PLC compare instruction
S7-200 PLC high speed counter instructions
(1) each counter has a 32-bit high-speed current values of preset and a 32-bit value, current value, and default value for the signed integer values. To set the new high speed counter current and new preset values, you must set the control byte (table 6-7), making it the fifth and sixth bit is 1, allow … Continue reading S7-200 PLC high speed counter instructions
S7-200 PLC type of interrupt sources
S7-200 sets the interrupt function for real-time control, high-speed processing, communications and control of complex and special tasks such as network. Disruption is to terminate the currently running program, to carry out immediate interrupt service program has been developed in response to signals, is complete and then return terminated the program and continue to run.Interrupt … Continue reading S7-200 PLC type of interrupt sources
S7-200PLC structure
1. Status indicator (LED) displays the CPU's job status.SF--System Fault (System error)RUN--runSTOP--stop 2. Memory cards can be inserted memory card 3. Communication interface can be connected RS-485 communications cable_ EMBED PBrush ___ 4. Top cover bottom for output terminals and the PLC power supply terminal. Running from the top of the output terminal terminal block cover beneath a … Continue reading S7-200PLC structure
Siemens PLC interface module
S7-200 digital I/O module interface module, analog I/O modules and communication modules. These modules are introduced below.(A) the digital I/O moduleDigital I/O module is native integration to solve digital input/output points can not meet the need to use extension modules. S7-200PLC currently offers 3 categories in total, total 9 digital I/O module.1. EM221 digital input … Continue reading Siemens PLC interface module
Structure of the Siemens S7 PLC timer
S7 clock time by time and time value is composed of two parts, time is equal to the product of time and timing values. When the timer runs, the timing values continue to lose 1, until reduced to 0, down to 0 means that the time to. Time after time to cause the timer contacts.Timer … Continue reading Structure of the Siemens S7 PLC timer
Siemens S7 series PLC types And application software
Germany Siemens (SIEMENS) produced by application of programmable logic controller in China is quite extensive, in the fields of metallurgy, chemical industry, printing production line are used. Siemens (SIEMENS) PLC of company products including LOGO,S7-200,S7-300,S7-400, industrial network, HMI HMI, industrial control software.PLC Siemens S7 series of small size, speed, standardization, network communication capabilities, more powerful, … Continue reading Siemens S7 series PLC types And application software
S7-300 PLC CPU Panel features
1, load power supply moduleLoad power supply module is used to convert AC 220V power supply DC 24V, for use by the CPU and I/O module and other modules.2, backup batteryBackup battery in the PLC is the role of power, to ensure the normal operation of the real-time CPU clock, and you can save a … Continue reading S7-300 PLC CPU Panel features
Siemens S7-300PLC OB tissue
OB73 redundancy error OBWhen the first redundancy fault-tolerant S7 connection is lost, the h CPU operating system called OB73 (fault-tolerant only S7 communication S7 connection) if other fault-tolerant S7 connection redundancy is lost, then there will be no more OB73. Until for all S7 connection is restored after redundancy with fault-tolerant features, will there be … Continue reading Siemens S7-300PLC OB tissue
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