The DECO decoding instruction I feel quite difficult to understand. Recently, some netizens said that they can compile a small instruction to test the difficult instructions, and then read the results, which is better understood.
I used the Mitsubishi plc simulation software to run the simulation.
I use the rising edge of M8013 to trigger MOV K0 D0, and use the falling edge of M8013 to trigger INCP D0.
Then use the decoding instruction DECO D0 Y100 K3 to decode, the intention is to let Y00 ~ Y07 cycle output. The result is that only Y00 and Y01 are alternately output. Later, the result of the analysis may be that D0 immediately sets the rising edge to 0 after the falling edge, and the next pulse cannot be executed by the "plus one" command. Then delete MOV K0 D0 and the result is correct.
Further simulations show that when K=1, there is only one output; when K=2, there are 4 outputs; when K=3, there is
8 outputs, when K=4, there are 16 outputs. In this example, DECO D0 Y100 K3, because K=3, is set as follows:
D=0 Y00=1
D=1 Y01=1
D=2 Y02=1
D=3 Y03=1
D=4 Y04=1
D=5 Y05=1
D=6 Y06=1
D=7 Y07=1
It feels interesting and is recorded here. Looking forward to peer correction.
The optical module (optical module) is composed of optoelectronic devices, functional circuits and optical interfaces. The optoelectronic device includes two parts: transmitting and receiving.
Simply put, the function of the optical module is to convert the electrical signal into an optical signal at the transmitting end, and after transmitting through the optical fiber, the receiving end converts the optical signal into an electrical signal.
The optical module is an optoelectronic device that performs photoelectric and electro-optical conversion. The transmitting end of the optical module converts electrical signals into optical signals, and the receiving end converts optical signals into electrical signals. Optical modules are classified according to the packaging form. Common ones include SFP, SFP+, SFF, Gigabit Ethernet Interface Converter (GBIC), etc.
The transmitting part is: the electrical signal with a certain code rate is processed by the internal drive chip and then drives the semiconductor laser (LD) or light-emitting diode (LED) to emit the modulated light signal of the corresponding rate. The internal optical power automatic control circuit makes The output optical signal power remains stable.
The receiving part is: the optical signal of a certain code rate is input into the module and then converted into an electric signal by the light detection diode, and the electric signal of the corresponding code rate is output after the preamplifier.
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