PLC the PLC operating system with basic intelligence, able to complete PLC Designer provides a variety of work. User programs designed by the user, it allows the PLC can complete features specific to user requirements. User program memory capacity in bytes (Byte, b for short) as the unit.1. PLC used physical memory(1) random access memory … Continue reading SIEMENS S7-300 PLC CPU memory
S7-400 backup power supply
S7-400 one or two spare batteries that are installed in the power supply module, stored in the built-in loading memory and external loading memory, working memory for user programs in the RAM and internal clock backup power to keep variables in memory.By CPU on the Panel "EXT.-BATT." (External battery) jacks provide DC 5~15V voltages, you … Continue reading S7-400 backup power supply
Classification of CPU S7-400 modules
S7-400 there are 7 kinds of S7-400H, CPU has two kinds of CPU. 412-1 CPU and 412-2 CPU are used for medium sized and small scale projects, the integrated MPI/DP interface allows the configuration for the DP interface, 412-2 CPU has two DP interface.414-2 CPU and 414-3 CPU with moderate performance, applicable to the scale … Continue reading Classification of CPU S7-400 modules
CPU S7-400H/F/FH
414-4H CPU and 417-4H CPU is a S7-400H fault tolerant automatic control system and S7-400F/FH security type automatic control system of the CPU module, with a F running authorization, you can compile and run the F user program.They have two slots for the installation of sync modules.
Common characteristics of CPU S7-400 module
1) S7-400 has 1 central racks, which can be extended to 21 extended stands. Multiple CPU processing using UR1 or UR2 rack can be installed up to 4 CPU. 6 IM (interface modules) are used at most in each center frame, and 6 S5 modules can be connected to the central machine frame through the … Continue reading Common characteristics of CPU S7-400 module
S7-400 power module
The power supply module of S7-400 provides 5V DC and 24V DC power supply to each module through the back board. Output current ratings are 4A, 10A, and 20A. PS 405 of the input for the DC voltage, PS 407 of the input for the DC voltage or AC voltage, S7-400 with a redundant function … Continue reading S7-400 power module
STEP 7 hardware configuration task
The PLC control system design of the early, first of all, should according to the system input and output signal properties and points, and the function of the control system requirements, determine the hardware configuration of the system, such as types of CPU module and power module and need to which input / output module … Continue reading STEP 7 hardware configuration task
STEP 7 hardware configuration tool HW Config
Select the SIMATIC manager on the left side of the station, double-click the right window of the "hardware" icon, open the hardware configuration tool HW Config (1) hardware directoryYou can use the menu command to "view", "directory" or the button on the toolbar to open or close the hardware directory window on the right. Select … Continue reading STEP 7 hardware configuration tool HW Config
PLC ladder programming sequence control
Learning PLC programming, we often encounter the sequential control, but how to make plc ladder diagram，there is example Shuttle program.The initial state of the car parked in the middle (limit switch X0 is pressed, the normally open contact closure),Press the Start button (X3 closed), the car began to follow the direction shown to reciprocate when … Continue reading PLC ladder programming sequence control
Sequence delay control PLC ladder diagram Program
plc programming often using timers and counters for Sequence delay control.After X0 is turned ON,begin delay, after 10s Y0 turn on, after delay 20s Y1 turn on, after 30s Y2 turn ON. http://www.plchelpcenter.com/2016/07/10/sequence-delay-control-plc-ladder-diagram-program.html
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