GE 296PLUS-DO-100P-120 On site interface module
If an expansion unit is to be used, the grounding point of 296PLUS-DO-100P-120 should be connected to the grounding point of the basic unit.
In order to suppress interference on the power supply, input and output terminals, a dedicated ground wire should be connected to the programmable controller at 296PLUS-DO-100P-120, and the grounding point should be separated from the grounding point of power equipment (such as motors).
If this requirement is not met, 296PLUS-DO-100P-120 must also be grounded in common with other equipment and is prohibited from being grounded in series with other equipment. The grounding point of 296PLUS-DO-100P-120 should be as close as possible to the PLC.
When using input devices with passive contacts, the internal 24V power supply of the PLC provides a current of 7mA per point to the input terminal through the input devices.
When the number of points increases to a certain value, the corresponding memory capacity, rack, motherboard, etc. also need to increase accordingly. Therefore, the increase in points has an impact on CPU selection, memory capacity, control function range, and other choices.
When estimating and selecting, full consideration should be given to ensure that the entire control system has a reasonable cost performance ratio.
PLC is widely used in industrial control due to its significant advantages. Its practical application involves many problems. This article only proposes some precautions for its on-site installation and maintenance, for reference by personnel engaged in PLC design and application.
Installation of PLC:
PLC is suitable for most industrial sites, but it still has certain requirements for usage scenarios, environmental temperatures, etc. Controlling the working environment of PLC can effectively improve its efficiency and lifespan. When installing PLC, avoid the following places:
(1) The range of ambient temperature exceeding 0-50 ℃
(2) Relative humidity exceeding 85% or dew condensation (caused by temperature fluctuations or other factors);
(3) Direct sunlight irradiation;
(4) Corrosive and flammable gases, such as hydrogen chloride, hydrogen sulfide, etc;
(5) Check for iron filings and dust;
(6) Frequent or continuous vibration, with a vibration frequency of 10-55Hz and an amplitude of 0.5mm (peak to peak);
(7) Impact exceeding 10g (gravitational acceleration).
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