Xinje XL Series - Q14: Why data errors after using DMUL instructions; Q15: Why the output point action errors after PLC; Q16: Why expansion module does not work while powe; Q17: Why the signal input but cannot see the high

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Q14: Why data errors after using DMUL instructions?
A14:
DMUL operation instruction is 32 bits*32 bits=64 bits operation, the result occupies 4 words,
such as: EMUL D0 D2 D10, two multiplier both are 32bit (D1,D0) and (D3, D2), the result is
64 bits (D13, D12, D11, D10), so D10~D13 will be occupied. If these data registers are used
latter, operation will error.
Q15: Why the output point action errors after PLC running for a
while
？
A15:
It’s possible that output terminal is loose, please check.
Q16: Why expansion module does not work while power indicator is
ON?
A16:
It is likely the connection of module strips and PLC pins or CPU is not good. Compare the
CPU and expansion in cross contrast way to find the problems.
Q17: Why the signal input but cannot see the high speed counter
working
？
A17:
If high-speed counting is to be carried out, in addition to connecting high-speed pulse to the
input of high-speed counting of PLC, the corresponding high-speed counting program should
be written with functional instructions. For details, please refer to the relevant content of
Chapter 5 of this manual.
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