Description
3720 Safety Instrumented System (SIS)
3720 Safety Instrumented System (SIS)
Module Clips Drive controller servo motor
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What are the types of integrated IO modules3720 Safety Instrumented System (SIS)
For a programmable logic controller, IO fulfills the responsibilities of data acquisition and instruction output. What control objectives can a PLC achieve, and the quantity and type of IO are crucial. For general integrated PLCs, the number and types of IO interfaces are constant. Some friends may ask, what if you encounter a complex control project with insufficient IO ports in the PLC? Don”t worry, nowadays PLCs have communication interfaces that can be connected to other IO couplers to achieve IO expansion. So, what are the types of IO modules that we can integrate in our daily lives? Actually, it can be mainly divided into four categories, namely:
1. Digital signal acquisition IO can achieve discontinuous signal acquisition, and a typical IO type is a counter input IO module.
Technology Oasis • Source: Guangcheng CAN Bus • Author: Guangcheng CAN Bus • 2022-05-09 09:52 • 1740 readings
For a programmable logic controller, IO fulfills the responsibilities of data acquisition and instruction output. What control objectives can a PLC achieve, and the quantity and type of IO are crucial. For general integrated PLCs, the number and types of IO interfaces are constant. Some friends may ask, what if you encounter a complex control project with insufficient IO ports in the PLC? Don”t worry, nowadays PLCs have communication interfaces that can be connected to other IO couplers to achieve IO expansion. So, what are the types of IO modules that we can integrate in our daily lives? Actually, it can be mainly divided into four categories, namely:
1. Digital signal acquisition IO can achieve discontinuous signal acquisition, and a typical IO type is a counter input IO module.
2. Digital output IO, which can send out command signals of digital quantities to control actuators, such as PWM IO, can send pulse signals to control servo motors and stepper motors. In addition to PWM IO, we often use relay output type IO.
3. After discussing digital IO, let”s talk about analog IO. Firstly, analog input IO includes voltage analog input IO, current analog input IO, temperature analog input IO, etc. They collect continuous signals.
4. Finally, there is the output type IO of analog quantity, mainly including voltage analog quantity output type IO and current analog quantity output type IO. Some friends may ask why there is no temperature this time, but there are relatively few applications, mainly based on voltage and current types.3720 Safety Instrumented System (SIS)
Industrial automation solutions, starting with remote IO modules!
The remote IO module is mainly used for collecting analog and digital signals on industrial sites, and can also output analog and digital signals to control equipment. It is possible to expand the input and output ports of data processing equipment such as PLCs and collection instruments. For example, a PLC only has 10 analog input interfaces, but if 30 analog quantities need to be collected on site, remote IO expansion needs to be added.
Furthermore, due to the distance between the equipment and the main control PLC or industrial computer, RS-485 bus is usually used for transmission. There are also some factories with high levels of automation that use industrial Ethernet to control remote IO modules. In the past, when laying lines between equipment and cabinets, people had to connect them one by one, which greatly increased the cost of cables and construction time. Moreover, if the distance was relatively long, they also faced problems such as voltage attenuation. And with the remote IO module, it effectively solves this problem. If your cabinet is 200 meters away from the site and you do not use remote IO, then you need to lay out each signal line for 200 meters. Installing the remote IO module on site can save you a lot of cable costs and reduce the complexity of construction from a cost perspective.
Simply put, sometimes some IO is set up in the on-site device cluster, which can be connected to the PLC through a communication cable to send the signal to any place where it is needed, saving wiring and PLC”s own IO points. Sometimes, the logical “remote” is because the allowed number of “local IO” cannot meet the actual needs, and it needs to be connected to the “remote IO template”, depending on the actual situation.
In addition, the general cabinet room is located on the device site. But some control signals, such as emergency stop and bypass, are implemented in the control room, so remote IO modules need to be used to send these signals to the control system in the cabinet room.
Why use remote I/O?
1. Because in some industrial applications, it is impossible to install PLCs with local I/O modules near on-site equipment due to harsh environments.
2. When you want to place the I/O module near the field device to eliminate long multi-core cables, you can receive signals from distant sensors and send remote control signals to control valves, motors, and other final actuators. The signal can be transmitted at any distance using various transmission protocols such as Ethernet and Profibus through high-speed media such as twisted pair and fiber optic.
3. Multiple transmission protocols such as Ethernet and Profibus can be used to send signals at any distance on high-speed media such as twisted pair and fiber optic.
The barium rhenium technology MXXT remote IO module uses industrial grade components with a wide working voltage of DC9-36V, which can operate normally within the range of -20~70 ℃. It supports RS485/232 communication mode, and the communication protocol adopts standard Modbus TCP protocol, Modbus RTU over TCP protocol, and MQTT protocol. We strive to fully meet the needs of our customers with an electrical and mechanical system that is anti-interference, resistant to harsh environments, and compatible with general use. It has stable performance, reliable quality, short delivery time, and fast response.
Advantages of Barium Rhenium Remote I/O Module
1. It can be controlled by remote commands.
2. Save the cost of using industrial control computers and IO cards, and Ethernet I/O modules can be directly connected to the upper computer system;
3. Replacing 4-20mA signal transmission with 10/100MHz Ethernet transmission has improved transmission speed;
4. Replacing various instrument controller signal lines with an Ethernet cable reduces the attenuation of remote signal transmission;
5. The signal cable of the instrument controller only needs to be connected to the Ethernet I/O module, greatly reducing cable costs and wiring workload.
6. Convenient installation method. Rail installation, high reliability, strong anti-interference ability, and more convenient on-site installation.
What is the function of an IO chip
Io generally refers to input and output devices, where I is the input and O is the output. The input to the IO port of the chip is the external signal transmission to the chip, while the output is the internal signal transmission to other devices. The input and output are relative. In short, in a broad sense, the control of input and output interfaces is called an IO chip, and network cards are also considered IO or array cards.
The CPU must read and write data to external registers or ROMs on RAM or other hardware through IO commands (such as input/output commands). For example, reading a keyboard involves accessing external registers on the keyboard through the 60H port, and the chip on the keyboard scans the keyboard. Pressing or holding down a key for a long time will cause the chip to generate corresponding scan or break codes, which will be written to the external register of the 60H port, so that the CPU can achieve the purpose of controlling the keyboard. Therefore, I think IO chips should refer to a large category. The CPU already has powerful IO instructions and corresponding control buses.
51 microcontroller IO port input and output mode_ Four usage methods for IO ports
The traditional 51 microcontroller IO interface can only be used as a standard bidirectional IO interface. If it is used to drive LED, it can only be driven by injecting current or using a transistor external expansion drive circuit.
Current injection method: LED positive pole connected to VCC, negative pole connected to IO port. If the IO is at a high level, the two poles of the LED are at the same level, and there is no current, the LED will turn off; IO is at low power level, current flows from VCC to IO, and LED lights up. But when you connect the positive pole of the LED to the IO interface and the negative pole to GND, placing the IO interface at a high level will cause the LED to light up. However, due to the insufficient pull-up capability of the IO interface, the brightness is not ideal. The following method can be used to solve this problem.
Push-pull working mode: The positive and negative poles of the LED are connected to two IO ports, and then the positive IO interface is set as the push-pull output, while the negative IO interface is set as the standard bidirectional current input. The push pull method has strong pull-up ability and can achieve high-level LED driving.
Four usage methods for IO ports3720 Safety Instrumented System (SIS)
From the perspective of the characteristics of the I/O port, the P0 port of Standard 51 is an open drain structure when used as an I/O port, and in practical applications, a pull-up resistor is usually added; P1, P2, and P3 are all quasi bidirectional I/Os with internal pull-up resistors, which can be used as both input and output. The I/O port characteristics of the LPC900 series microcontroller have certain differences, and they can be configured into four different working modes: quasi bidirectional I/O, push pull output, high resistance input, and open drain.
Compared with Standard 51, the quasi bidirectional I/O mode differs in internal structure but is similar in usage. For example, when used as an input, it must first write “1” to set it to high level before reading the level state of the pin.!!!!! Why is it like this? Please refer to the diagram below for analysis.
The characteristic of push-3720 Safety Instrumented System (SIS)pull output is that it can drive a large current regardless of whether it outputs high or low levels. For example, when outputting high levels, it can directly light up the LED (by connecting several hundred ohm current limiting resistors in series), which is difficult to achieve in quasi bidirectional I/O mode.
The characteristic of high impedance input mode is that it can only be used as an input, but it can obtain relatively high input impedance, which is necessary in analog comparator and ADC applications.
The open drain mode is similar to the quasi bidirectional mode, but there is no internal pull-up resistance. The advantage of open drain mode is good electrical compatibility. If the external pull-up resistor is connected to a 3V power supply, it can interface with a 3V logic device. If the pull-up resistor is connected to a 5V power supply, it can also interface with a 5V logic device. In addition, the open drain mode can also conveniently implement the “line and” logic function.
For the explanation of the above question, there is this information:
High resistance state is a common term in digital circuits, referring to an output state of a circuit that is neither high nor low. If the high resistance state is input into the next level circuit, it has no impact on the lower level circuit, just like not connected. If measured with a multimeter, it may be high or low, depending on what is connected afterwards.
High resistance states can be understood as open circuits during circuit analysis. You can think of it as having a very high output (input) resistance. His limit can be considered suspended.
Typical applications of high resistance states:
1. On the bus connected structure. There are multiple devices hanging on the bus, and the devices are connected to the bus in a high impedance form. This automatically releases the bus when the device does not occupy it, making it easier for other devices to gain access to the bus.
2. Most microcontroller I/O can be set to high impedance input when used, such as Lingyang, AVR, and so on. High resistance input can be considered as having infinite input resistance, indicating that I/O has minimal impact on the preceding stage and does not generate current (without attenuation), and to some extent, it also increases the chip”s resistance to voltage surges.
1.Has been engaged in industrial control industry for a long time, with a large number of inventories.
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