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Different ways to monitor RWMs

Different ways to monitor RWMs. J.-D. Chatelain. Possible values for V A. 1.2V. 200 mV. 3.8V. Biasing a Read/Write Module. 4V. V B. R p. R M. 4V. V B. 1V. Constraints: 1V < VA < 4V 1V < VB < 4V D V = VA - VB > 200 mV. 1.2V < VA < 4V 1V < VB < 3.8V. 4 V. V B. V A = 3.36 V.

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Different ways to monitor RWMs

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  1. Different waysto monitor RWMs J.-D. Chatelain

  2. Possible values for VA 1.2V 200 mV 3.8V Biasing a Read/Write Module 4V VB Rp RM 4V VB 1V Constraints: 1V < VA < 4V 1V < VB < 4V DV = VA - VB > 200 mV 1.2V < VA < 4V 1V < VB < 3.8V

  3. 4 V VB VA = 3.36 V VB = 3.03 V 200 mV 1 V VB = 3.03 V VB Monitoring a Read/Write Module by means of a RS485 half-duplex output Twisted pair VB Ro = infinite Ri = 120 W Calculate: VA, VB and DV DV = 325 mV

  4. Monitoring a Read/Write Module by means of a microcontroller DE and RE DI RO VA - VB

  5. Multiplexing Read/Write Modules

  6. Multiplexing Read/Write Modules … a more elegant solution Each adaptor has its own virtual COM port COM 1 COM 5 COM 1 COM 5

  7. Connecting RWMs to a PLC with an ASCII driver

  8. Connector Shield Read/Write Module Motor Connector Shields Read/Write Module Motor Copper covering Aluminium shield Strongly disturbed environment Not recommanded Recommanded Conform to the CEI/IEC 61000-4-4 level 3 standard Twisted pair Twisted pair

  9. End of this chapter Different waysto monitor RWMs J.-D. Chatelain

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