Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
  • H01B7/00—Insulated conductors or cables characterised by their form
  • H01B7/08—Flat or ribbon cables
  • H01B7/0838—Parallel wires, sandwiched between two insulating layers

Definitions

• This invention relates to an input/output (I/O) data cable for use in interconnecting the modular components of a programmable controller.
• I/O input/output
• a programmable controller comprises a processor which controls the operation of the system being controlled by receiving logic signals from a plurality of input modules and feeding logic signals to a plurality of output modules, the input and output modules being connected to the processor through respective data cables. Also the logic level voltage must be fed to the input modules, output modules and processor.
• the logic signals which pass between the processor and the input and output modules are subjected to considerable interference especially in the case when the system being controlled is a machine. Accordingly, it is necessary to ensure that the interconnecting data cables have high immunity from such interference.
• an input/output data cable for a programmable controller comprising a flexible laminate made up of three layers, each layer having a conducting part and an insulating part, the first of said layers being adapted to be connected to the system ground, the second of said layers being adapted to carry a logic voltage, and the third of said layers having a plurality of signal tracks for carrying data signals, wherein said first and second layers are adjacent.
• an input/output data cable for a programmable controller comprising a flexible laminate made up of two layers, each layer having a conducting part and an insulating part, the conducting part of the first of said layers having a single conductin track extending substantially across the whole width of the layer, and the conducting part of the second of said layer being formed by a conducting track extending over part of the width of said layer and by a plurality ofsignal tracks for carrying data signals.
• Fig. 1 is a top plan view of one embodiment of a data cable made in accordance with said one aspect of the present invention
• Fig. 2 is a sectional view taken along the line II - II of Fig. 1;
• Figs. 3a, 3b and 3c are plan views of the three layers of the data cable of Fig. 1;
• Figs. 4a and 4b are perspective and elevational views respectively of a connector for use with the data cable of Fig. 1;
• Figs. 5a and 5b are plan views of the two layers of one embodiment of a data cable made in accordance with said second aspect of the present invention.
• an input/ output data cable 1 for interconnecting the modular components of a programmable controller comprises a flexible laminate assembly made up of three layers 10,
• the layer 11 and 12 each having a conducting part and an insulating part.
• the layer 11 is used for the logic voltage; the layer 12 is used for the system ground and layer 10 is used for data signals. As illustrated in Figs. 3a and 3b the layers 11 and
• each of the copper tracks 110 and 120 each comprise a single copper track 110 and 120 attached to an insulating polyester strip 111 and 121 respectively. At the ends of each of the copper tracks 110 and 120 there are provided contact tabs 114 and 124 respectively for connection with a connector as hereinafter described.
• the layer 10 comprises a plurality of side-by-side signal carrying conductors 100 extending along the layer
• the data cable is formed by glueing the layers together one on top of the other to form a laminate structure so that the logic voltage carrying layer 11 and system ground layer 12 are adjacent and the data signal carrying layer 10 is on the exterior.
• An additional insulating strip 133 is laid on top of the layer 12.
• the resultant assembly comprises a flexible laminated cable having relatively wide area, tracks the adjacent layers being extremely close to each other.
• This arrangement provides high immunity and additionally minimises inductive losses along the data signal tracks due to the relative closeness of the logic voltage carrying layer 11.
• a suitable terminal 40 is illustrated in Fig. 4. and is adapted to be attached to each end of the data cable 1.
• the terminal 40 has a plurality of spaced contacts 41, end ones 41a and 41b contacting with the respective tabs 114 and 124 of the voltage level layer 11 and ground layer 12.
• Central contacts 41c engage respective tracks of the data signal layer 10.
• the data carrying layer 10 should be placed adjacent the grounded layer 12.
• a data cable is made up of two layers 21 and 22.
• the first of the layers 21 comprises a single copper track 210 attached to an insulating polyester strip 211, a contact tab 214 is provided for connection with a conductor of the type illustrated in Figs. 4a. and 4b.
• the second layer 22 comprises a copper track 220 extending across substantially half of the width of the layer 22 and a plurality of side-by-side signal carrying conductors 225.
• the track 220 and conductors 225 are attached to an insulating polyester strip 221 and the track 220 is provided with a contact tab 224.
• the data cable is formed by glueing the layers 21 and 22 together one on top of the other to form a laminate structure.
• the logic voltage can be applied either to the track 214 or track 224 depending on the system design, ground being connected to the other track.

Landscapes

• Insulated Conductors (AREA)
• Communication Cables (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10498969

Family Applications (1)

Country Status (10)

Cited By (3)

Families Citing this family (1)

Citations (3)

Family Cites Families (2)

• 1979
  • 1979-08-08 JP JP54501204A patent/JPS6248328B2/ja not_active Expired
  • 1979-08-08 WO PCT/GB1979/000133 patent/WO1980000389A1/en unknown
  • 1979-08-09 IE IE1527/79A patent/IE48617B1/en unknown
  • 1979-08-09 CA CA000333483A patent/CA1139855A/en not_active Expired
  • 1979-08-10 IT IT68651/79A patent/IT1119143B/it active
  • 1979-08-10 AU AU49793/79A patent/AU536152B2/en not_active Ceased
  • 1979-08-10 ES ES483323A patent/ES483323A1/es not_active Expired
  • 1979-08-10 IT IT7953510U patent/IT7953510V0/it unknown
  • 1979-08-10 ZA ZA00794174A patent/ZA794174B/xx unknown
• 1980
  • 1980-03-11 EP EP79900873A patent/EP0015287A1/en not_active Withdrawn
  • 1980-04-10 DK DK153280A patent/DK148570C/da not_active IP Right Cessation

Patent Citations (3)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events