Based on the use of IO - Sharing - Link web design boundary layer node technology Communication network -

IO - Summary of the Link IO - 链接( IEC 61131 - 9) Is a point-to-point serial communication protocol, to include sensors, actuators and low power consumption microprocessor intelligent edge layer nodes is optimized.

it is the basic form of three wire connection, you can switch between analog and digital signals ( 8, 12 and 16) 。 It concise, intelligent, efficient and can be configured, and have the ability to provide more information and control, which has been widely industrial support.

in a typical industrial installation, multiple IO - Link the main operational actuators and collecting data from sensors; They also can dynamically reconfigure the sensors and actuators.

programmable logic controller ( PLC controller) May contain multiple IO - Link master station, each host is connected to one or more devices. PLC is itself a local area network ( Field bus, for example) On the node. More high speed network, such as industrial Ethernet in the PLC between hub and a higher level of enterprise or cloud data transmission and command.

IO- Standard pinout Link according to the M5, M8 M12 circular shape dimension, connect the data Link and power combination in a single connector: M12 is most commonly used. Sensor connector has four pins, actuators are five pins: IO - Link the main devices usually have five pin socket.

the standard defines two port, the port A and port B: pins 1, 3, and 4 in two ports classes perform the same function.

, in the port A pins 2 and 5 do not specify A specific function, but the manufacturers often use pin 2 as additional digital communication channels. In port B pins 2 and 5 with the larger demand components to provide additional power supply.

IO- The Link specification with backward compatibility, and can adapt to the old equipment. The main can use standard input/output ( SIO) Function to operate these devices, the C/Q serial links into discrete digital I/O port. The SIO is also supported the IO - The link sensors used in combination with traditional input module. The main side ( ILLM) C/Q lines with load current, also supports with discrete PNP output ( Only drive high level) The old sensor used in combination. Use the IO -

IO - Link design boundary layer nodes Link protocol for powerful low-cost edge layer nodes laid a solid foundation, FIG. 2) 。 This kind of low energy node in the realization of IO - Link connection using only the three active components: IO - The Link transceiver ( MAX14827A) , step-down voltage stabilizer ( MAX17552) Type, monitoring micro-controller.

Maxim Integrated MAX14827A transceiver to send and receive IO - The Link, and through the three-wire UART exchange data with monitoring type micro controller. The device also comes with SPI interface, can provide diagnostic information. Reuse the UART/SPI option will UART and SPI interface combination for a single set of common pin.

MAX14827A has two kinds of operation mode, determined by the voltage on the SPI/PIN. In the PIN mode ( SPI/PIN low) , UART and SPI are disabled, according to the need to connect the SPI/UART pin to high level or low level, to set up the device configuration.

in this mode, some function is set to a fixed value. When the SPI/PIN connection high electricity at ordinary times, SPI and UART is enabled, used to configure MAX14827A, monitoring its operation, and the transmit and receive IO - The Link information.

in addition to the IO - The Link interface, MAX14827A also integrates industrial iot sensor nodes need a variety of common functions, such as drive and voltage stabilizer. This can reduce the number of components and the node size. These features include:

two low-power logic level integrated LED drive

3. 3 V and 5 V linear regulator, power supply rail for low noise analog or logic.

if DI/DQ don't need to work, can use push pull, PNP and NPN mode of other digital input and output.

MAX14827A thermal overload and fault conditions, can be detected and provide reverse polarity protection and thermal power protection. This device can also trigger interrupt according to various conditions, such as IO - Link sensei, overtemperature, drive overload, low voltage V24 pin.

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