2 General Device Description
The Protocol Converter consists of a basic circuit board and a power supply
circuit board with DC/DC transformers in which all the required auxiliary volta-
ges are created.
The AM188ES processor is inserted on to the basic circuit board. It contains a
built-in timer, interrupt- and DMA-Controller, 2 serial interfaces and thus requi-
res only a few external nodules. The computing power is adequate for processing
even large quantities of data. Furthermore, the 16 Bit processor ensures efficient
software development in a high level language.
The Firmware and the configuration data are stored in a FLASH-EPROM. This
can be programmed within the circuits and retains its data even when the opera-
ting voltage is switched off.
The serial interfaces are realized by the microprocessor and the ASIC SJA1000.
The device to be connected is linked with the first non-floating interface. A
choice can be made between a RS232C, RS422- or a RS485 interface with the aid
of a plug-in jumper. The second potential-free interface is designed for use at the
CANopen.
The proper function of the Protocol Converter is monitored by the internal
Watchdog of the micro- processor and the internal operating voltage by means of
the MAX809 module. In the case of error, these monitors trigger a Reset at the
processor.
The internal supply voltage is generated by means of a switched mode regulator.
Its input voltage is filtered via a current-transformed toroidal choke and filter ca-
pacitors. A transient diode is available as spike and polarity reversal protection.
In the case of malfunction, a semiconductor fuse switches the device down to a
low residual current until the malfunction is cleared. This means that the chan-
ging of an internal sensitive fuse is dispensed with. Besides this, a charging ca-
pacitor is available that blocks the voltage dips that occur in the switching of
fuses.The operational readiness and an error in the communication interface of
the Protocol Converter as well as the CANopen status are displayed by LEDs.
Block diagram of the PKV30-COS Protocol Converter.
Spannumgsüberwachung = Voltage supervision. Gerät diagnose = Device diagnostic
General Device Description
5
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