3BHE020356R0101 GFD212A | ABB | Bus impedance matching module

Description

3BHE020356R0101 GFD212A | ABB | Bus impedance matching module

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The power supply Vdd and Vcc used on both sides of the photoelectric isolation device must be completely isolated, otherwise the photoelectric isolation will lose its intended function. The isolation of the 3BHE020356R0101 GFD212A power supply can be achieved through a low-power DC/DC power isolation module, such as a low-power DC/DC module with a DIP-14 standard pin size of 5V dual isolated output.

The sending data input terminal TXD of the CAN transceiver 82C250 in Figure 1 is connected to the output terminal OUT of the optocoupler 6N137. Note that TXD must be connected to the pulling resistor R3 at the same time. On the one hand, R3 ensures that the photosensitive transistor in 6N137 outputs a low level when conducting and a high level when cutting off; On the other hand, this is also a requirement of the CAN bus. Specifically, the state of the TXD terminal of 82C250 determines the state of the high and low level CAN voltage input/output terminals CANH and CANL (see Table 1). The 3BHE020356R0101 GFD212A bus specifies that the bus should be implicit during idle periods, meaning that the default state of nodes in the CAN network is implicit. This requires the default state of the TXD end of 82C25O to be logic 1 (high level). To this end, it is necessary to ensure through R3 that the state of TXD end is logic 1 (high level) when no data is sent or abnormal situations occur.

The end of the CAN bus must be connected with two 120 Ω resistors, which play an important role in impedance matching of the bus and cannot be omitted. Otherwise, 3BHE020356R0101 GFD212A will greatly reduce the reliability and anti-interference ability of bus data communication, and may even lead to communication failure.

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