plc IO modules in industrial automation fieldbus communication.

Programmable Logic Controller (PLC) is the main industrial control systems. PLC systems and in-depth to use on the factory floor sensor / actuator interfaceplc IO module. IO module must meet stringent electrical specifications, can be divided into current, voltage, and plc digital input output io module. We will explore conditioning and solutions designers face, and touch these signals to meet the challenges of these challenges. These IO modules in the industrial field bus communication. Therefore, we will briefly explain the processor and interface solutions in industrial automation fieldbus communication.

The role of plc IO module

plc input module for receiving the various parameters of the production process. (Start and stop with the input)

input output module plc for programmable controller operation after sending the information obtained and completed by various control industrial site outside the machine actuators. (Execution results with output)

1 have a good anti-jamming capability.
2 to meet the matching requirements of various types of industrial field signals.

input module plc Wiring

 During normal smart plc operation, different methods of connecting the field device wires to the I/O Modules offer no significant advantages over each other. Field devices can be wired differently to provide safety and protection in the event of failures in field devices, or faults in their electrical circuits.
"Backups" are field devices required to operate properly to provide safety in the event of a failure of another device or fault in a circuit. If the circuit for a backup is not affected, the backup should operate properly and continue to provide safety.
 The safety of input module plc sequentially controlled systems, industrial facilities, and even personnel frequently depends on field devices (especially the backups) operating properly.
  Sink and Source connections at a DC plc analog input module are defined by whether or not the field device DC power comes from a power supply external to the PLC. Neither connection has any fault protection advantage.

plc IO module programming

PLC programs are typically written in a special application on a personal computer, then downloaded by a direct-connection cable or over a network to the PLC. The program is stored in the plc IO module either in battery-backed-up RAM or some other non-volatile flash memory. Often, a single PLC can be programmed to replace thousands of relays.[7]
Under the IEC 61131-3 standard, plc analog output module can be programmed using standards-based programming languages. A graphical programming notation calledSequential Function Charts is available on certain programmable controllers. Initially most plc logic controller utilized Ladder Logic Diagram Programming, a model which emulated electromechanical control panel devices (such as the contact and coils of relays) which PLCs replaced. This model remains common today.

Input Module plc Product Features:

input module plc process of converting from an external digital signal is sent to the controller ethernet module plc‍ internal signal level. 

Input voltage can be connected to a variety of signals of different processes: 

In addition to economical, plc power supply module‍ to use, but also has a special function: 

When the alarm mode and diagnostic process, such as for a source for current or leakage current 

Also offers special modules for process engineering.‍

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.