Input Modules plc Product Design:

input module plc has the following mechanical properties: 

Compact design: 

Rugged plastic enclosure inside include: Green plc temperature control module‍, status indication for signal input. Before connecting socket, through the front door to protect the label area on the front door. Easy installation: 

No slot rules; enter an address determined by the slot. 

When used in conjunction with a bus in the ET plc logic controller‍ modules can be hot-swappable. User-friendly wiring. 

With 8,16,32 or 64-channel modules.

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Enter the installation of wiring module plc

input module plc end if set to "always check line" status input module input end of the line (away from the module side) must be parallel with the termination resistor programmable logic controller (plc) suppliers  module inputs If set to "normally closed check line" Status Input Module Input end of the line (away from the module side) must be a plc analog output module in series termination resistors. When the module is active output, active output terminal should be parallel termination resistor 4.7kΩ, and IN4007 series with a diode.

The role of output modules plc

Fire alarm, the alarm controller output module needs to start by the linkage of external control devices, such as ethernet module plc‍ control valve, sending valve, fire shutter doors, fans, alarm, etc., and to accept the action device to answer. 

output module plc connected to the bus loop controller can be installed in the vicinity of the control equipment can also be installed in the plc high-speed counting module‍ inside the terminal module. Electronic writing code, you can live encoding. Ji-output control logic output module can be completed according to the project situation programming. When the controller receives the alarm signal to the detector, based on pre-programmed into the procedure, the controller via the bus output control signal to the interlocking modules, output modules linkage needs to start fire-fighting equipment; action after the device receives a reply signal.‍

IO module, also known as the PLC control module

plc IO module is also called a control module, can be output when the control request signal or a switching signal to plc communication module‍ operation of the controlled device, and may receive a feedback signal from the device to the host to report to the fire alarm system linkage important part of the input and output modules on the market can provide a pair of passive normally open / normally power supply module plc‍ contacts for controlling the controlled device, some manufacturers of modules through parameter setting, set to active output (eg Bay GST-LD-8301), there are also double the corresponding input and output modules, the input and output modules, and so more.

Input Module plc's shortcomings

input module plc Disadvantages: module mechanism to bring safety hazard 

1, the intercept system calls. 

2, modify the output symbol table. 

3, by modifying the system calls the plc temperature module‍ themselves hidden. 

4, redirect file operations. 

5, modify the file owner. 

6, plc controller suppliers‍ processes. 

7, the executable file redirection. 

8, calling sys_socketcall by modifying the system, making the system after receiving the specified data packet open the back door 

9, TTY hijacking. 

10 virus.‍

Output modules plc explanation

output module plc, known as members, is a collection of individually named and independently able to complete certain functions of plc program logic controller‍ statements (ie, aggregate program code and data structures). It has two basic characteristics: internal features and external features. Wherein the external plc digital input output module‍ module with means to contact the external environment (i.e., program modules or other way to call the module, including input and output parameters, global variables referenced) and functional modules; internal environment is the internal characteristics of the module having the characteristics (i.e., the local module data and program codes).

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plc io module is divided into several modules by function

plc IO module is divided into several modules according to function, such as CPU modules, input modules, output modules, power modules, and so on. The module features a communication modules plc‍ mainframe is more some kind of modules and therefore relatively more. This can also be said to be the trend. At present, some medium-sized machine, the module features also tend to single species also increases Township. If the same OMRON Corporation intelligent plc‍ series PLC, H machine CPU unit to contain the power, and put the power ceded Ha machine, a separate power supply module.