©Contrinex JDC PPT_LF_MonitoringRWMs Different ways to monitor RWMs J.-D. Chatelain

RMRM RpRp VBVB VBVB 200 mV 1V 4V 3.8V 1.2V Possible values for V A 4V Constraints: 1V < VA < 4V 1V < VB < 4V  V = VA - VB > 200 mV 1.2V < VA < 4V 1V < VB < 3.8V Biasing a Read/Write Module

VBVB 1 V 4 V VBVB 200 mV Twisted pair R o = infinite R i = 120  Calculate: V A, V B and  V VBVB  V = 325 mV V A = 3.36 V V B = 3.03 V Monitoring a Read/Write Module by means of a RS485 half-duplex output

DE and RE DI RO V A - V B Monitoring a Read/Write Module by means of a microcontroller

Multiplexing Read/Write Modules

… a more elegant solution Each adaptor has its own virtual COM port COM 1 COM 5 COM 1 COM 5

Connecting RWMs to a PLC with an ASCII driver

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

©Contrinex JDC PPT_LF_MonitoringRWMs Different ways to monitor RWMs J.-D. Chatelain End of this chapter