IS220PRTDH1A Processor board operation

Description

IS220PRTDH1A  Processor board operation
IS220PRTDH1A  I/O packets or modules function specific acquisition boards connected to processor boards. When an input power supply is applied, the soft-start circuit gradually increases the available voltage on the processor board. The processor is reset and turned off, and the local power is turned on in sequence. After completing the self-check routine, the processor loads the application code from the flash memory specific to the I/O package or module type. In order to verify whether the application code, acquisition board and terminal board match correctly, the application code reads the board ID information. When the match is good, the processor attempts to initiate an Ethernet connection by requesting a network address.

The industry-standard Dynamic Host Configuration Protocol (DHCP) and the unique identifier of the terminal board are used in the address request. Once the Ethernet is started, the CPU runs applications that program the onboard logic and allow the acquisition board to start working.

The entire circuit needed to enable I/O packets to run from one or two Ethernet inputs is included in the processor application code. When two Ethernet inputs are used, both network paths are always active. I/O packets or module operations will not be affected by any single network failure, and working network connections will show failure. This configuration is more fault tolerant than a traditional hot backup system, in which the second port is used only when the primary port fails. The processor’s Ethernet port automatically negotiates between half-duplex and full-duplex operations at speeds between 10 MB/s and 100 MB/s.

The processor board is common to all Mark VIe Ethernet I/O packages or modules. It contains the following:

A fast processor with RAM and flash memory comes first.
Two fully independent 10/100 Ethernet port plugs
Hardware reset and watchdog timer circuit
Internal temperature sensor
An LED indicating the status
The ability to read ids and electronic identifiers on other boards
Input power connector with current limiter and slow start function
Local power, which also includes monitoring and sorting

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