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MOOG CPU Controller D136-001-007 D138-002-002 D136-001-008a

MOOG CPU Controller D136-001-007 D138-002-002 D136-001-008a

MOOG CPU Controller D136-001-007 D138-002-002 D136-001-008a

4 Hardware Anti-jamming measures

4.1 Suppression of power interference

The plc system power supply must be separated from the power supply of the entire power supply system, and the shielded isolation transformer is generally added between entering the plc system. A twisted pair of not less than 2mm2 must be used between the secondary side of the shielded isolation transformer and the plc system. The shield is generally located between the two coils on the first and secondary sides and is connected to the ground, so that the direct coupling between the coils can be eliminated. In addition, when the harmonics of the power supply are more serious, a filter can be added in front of the isolated regulator to eliminate most of the harmonics of the power supply. If necessary, a low-pass filter can be connected to the power supply line to filter out high-frequency interference signals. The filter should be placed before the isolation transformer, that is, filter first and then isolate. Separating the power supply system by separating the power supply of controllers, i/o channels and other devices with their own isolation transformers also helps to combat grid interference.

4.2 Suppression of interline interference

The plc control system line has a power line, input/output line, power line and ground line, improper wiring will cause electromagnetic induction and electrostatic induction and other interference, so it must be wired in accordance with specific requirements, such as equal spacing as far as possible, and avoid the line winding.

(1) Ground cable

For safety and suppression of interference, the system is generally properly grounded. The system grounding methods generally include floating ground, direct ground and capacitive ground. For plc control system, it is a high-speed low-level control device, should use direct grounding mode. Due to the influence of the signal cable distribution capacitance and the input device filter, the signal exchange frequency between the devices is generally lower than 1mhz, so the grounding wire of the plc control system uses one-point grounding and one-point grounding in series. The centrally arranged plc system is suitable for parallel one-point grounding, and the central ground point of each device is led to the grounding pole by a separate grounding wire. If the distance between the devices is large, the series one-point grounding method should be used. Use a large section copper bus bar (or insulated cable) to connect the cabinet center ground point of each device, and then connect the ground bus directly to the ground pole. Use a copper conductor with a cross section greater than 20mm2 for the ground cable, and a copper bar with a cross section greater than 60mm2 for the main bus bar. The grounding resistance of the grounding pole is less than 2ω, the grounding pole is best buried 10 ~ 15m away from the building, and the plc system grounding point must be more than 10m away from the ground point of the strong current equipment. When the signal source is grounded, the shielding layer should be grounded on the signal side. When not grounded, should be grounded on the plc side; When there is a joint in the middle of the signal line, the shielding layer should be firmly connected and insulated, and multi-point grounding must be avoided. When the shielded twisted pair of multiple measuring points signals is connected with the multi-core twisted total screen cable, the shielding layers should be connected to each other and treated with insulation. Select the appropriate connection to the single point contact. plc power line, i/o power line, input and output signal lines, AC lines, DC lines should be routed separately as far as possible. The switching signal line and the analog signal line should also be routed separately, and the latter should use a shielded line, and the shielding layer should be grounded. Digital transmission lines should also use shielded lines, and the shielding layer should be grounded. The plc system is best grounded separately, and can also be publicly grounded with other equipment, but it is strictly prohibited to be grounded in series with other equipment. When connecting the ground cable, note the following:

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MOOG CPU Controller D136-001-007 D138-002-002 D136-001-008a