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HI302 – User’s Manual
6.3
Protection
The HI302 has advanced specific components for protection against ESD and voltage
surge. However, bear in mind that good ground wiring is of fundamental importance.
Electrostatic Discharge (ESD)
The power input (DS1 and DS2) and all the communication channels are protected
against electrostatic discharges by specific (zener diodes) components with high response
speed and good power absorbing capacity (24W @ 1ms @ 25
o
C). In addition to this
protection, there are sparkles built on the printed circuit board, on every LEDs and on all
(CN5 and CN6) front connector pins. They are designed to sparkle with 200-300V
voltages, depending on the air humidity.
Surges, High Voltage and Grounding
Voltage surges, whether induced or conduced, occur often in industrial environments due
to electric motors, semiconductors switching and many other factors. Besides, there is
always the danger from atmospheric discharges that may permanently damage the
equipment. HI302 modules have components highly efficient against these surges, with
high absorption capacity (400W @ 1 ms @ 25
o
C) and a (typically < 1 ns) good response
speed, in addition to the PCI built-in sparklers. However, this protection is practically
useless without a good wire grounding.
ATTENTION
Indispensably, a good quality grounding (< 5
Ω
) must be connected to the system, either
on the DIN rail, on the power source, or directly to the module grounding terminal.
Without this, all protection for the HI302 module, as well as for other equipment, WILL
NOT WORK. Note that grounding resistance must be measured every 2 years.
Processing Core
The core of the HI302 module is based on the 68HC11 (U1) microcontroller running at 10
MHz (Y1): one of the most reliable and well accepted components in the whole world.
Around the microcontroller, there is the Fieldbus Smar FB3050 (U2) controller. Also there
are the 128x8 (U3) SRAM memories and the 512kx8 (U4) FLASH. And to store the
module configuration for the functional blocks and the HART commands there is a 32kx8
(U6) synchronous serial memory. A (U5) reset circuit/voltage supervisor is also part of the
equipment.
Firmware programming
Programming the firmware in the FLASH memory is done through a RS232 serial
interface (U2, on the backup board) by using the bootloader mode on the HC11. The
connector is accessed in the module’s lower part, and it can be done by user, if the
programming cable and the FBTools, basic to the System302, are available.
Содержание HI302
Страница 1: ...AGO 02 FOUNDATION H I 3 2 F M E...
Страница 4: ...HI302 User s Manual IV...
Страница 10: ...General Vision 1 4...
Страница 20: ...Installation 2 10...
Страница 46: ...Operation 5 12...
Страница 57: ...HI302 User s Manual 7 5...
Страница 59: ...HI302 User s Manual 7 7...
Страница 60: ...An Example of HI302 Usage 7 8...
Страница 64: ...Troubleshooting 8 4...