2. Extend unit address allocation
The function of the expansion unit is to expand the input and output, and the expansion unit starts from the next channel after the allocation channel of the CPU unit, and assigns the address backwards.
CP1W Expansion Unit
If the CPU unit comes with input occupying 0 channels and 1 channel, and the output occupies 100 channels and 101 channels, the CP1W expansion unit will be connected later:
Its inputs are distributed from 2 channels and backwards, up to a maximum of 16 channels;
The outputs are distributed from 102 channels and then backwards, up to a maximum of 116 channels.
The basic I/O expansion unit of CP1W, according to the number of input and output points, the number of input and output channels allocated is also different, and the bit allocation principle is the same as that of the input and output of the CPU unit, for example, the expansion unit with 12 input and 8 output occupies 1 channel each:
Its input bits occupy bits 00 - bits 11 of the assigned channel, and unused bits 12 - bits 15 will always be cleared and cannot be used as internal auxiliary work bits;
The output bit occupies bits 00 - bit 07 of the assigned channel, and the unused bits 08 - bit 15 can be used as internal auxiliary work bits.
For expansion units such as analog and temperature sensors, the addresses of the input and output channels are allocated according to the number of channels they occupy, for example, the CP1W-MAD11 is assigned 2 input channels and 1 output channel.
CJ series high-performance expansion unit
The address assignment of the CJ series high-performance expansion unit is related to its unit number, which is a hardware switch on the module, and the special I/O unit occupies the address 2000-2959 channels according to the order of arrangement
According to the order of arrangement, the CPU bus unit occupies the address 1500-1899 channel
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