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BUENO ELECTRIC
BUENO ELECTRIC
BUENO ELECTRIC
BUENO ELECTRIC
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Fax: +86-25-51816989
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A SCI (standard RS232 serial interface) is configured for this device, used for connection with PC. Various
tests would be carried out with the help of strong function of PC and the configured special commissioning
software package.
Inside this module, there could be Ethernet chip (selected) with very high communication speed and with
universal interface, used as communication interface for this device to connect with system. Common mode: the
device provides RJ45 communication interface, using shielded twisted pairs 5 (STP5) as communication media.
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Clock circuit
Hardware clock circuit is configured inside the module. Besides, CPU module adopts multi-layer PCBs and
SMT technique, with small and deft appearance and compact structure, which greatly improve the reliability and
EMI resistant ability.
3.4 Power supply module
This module is DC inverted power supply module. Through anti-interference filter circuit, DC 220V or 110V
voltage would output necessary four groups of DC voltage, 5V, 12V, 24V(1) and 24V(2), utilizing inversion
principle. The four groups of voltage are not common-grounded, and apply floating mode, and they are
unconnected with the rack.
a) 5V,12V are the power supply for CPU
b) 24V(1) is the power supply for driving relays
c) 24V(2) is the power supply for exterior inputs
To strengthen anti-interference ability of power supply module, the 24V power supply of DC inputs and
leading-out terminals are fitted with filters. The power supply module electric principle schematic is shown in
Figure 3-3.
Figure 3-3 Schematic diagram of the power supply module
3.5 Man-machine interaction module
The core of man-machine interaction (MMI) module is the single chip computer, whose bus is not in the out
side of the chip. Its main function is to display protection CPU output information, scan the keyboard status on
panel, and real-time transmit it to protection CPU. Therefore, for protection CPU, man-machine interaction
module is equivalent to its peripheral equipment. The communication between CPU and MMI is carried out
through SPI interface, with speed as high as 2Mb/s, which has high reliability. Using this configuration mode, the
