ABB JCU-01 Multiplexer switch module

ABB JCU-01 Multiplexer switch module

An output operation is initiated by executing an output transfer instruction that loads one of two output registers. The execution of this instruction sends the VMEbus an address that causes selection of the Digital-to-Synchro/Resolver Converter (DSC/DRC) Board if the board address switches match the address transmitted. The bit pattern of the data output word determines the position of the user’s torque receiver(s). The bit-to-angle conversion (position) information is shown in Table 3-1 on page 50. The Central Processor Unit (CPU) should not initiate large shaft position changes that may result in overdriving the torque receiver(s). High current electrical transients and mechanical transients may damage the torque receiver and or the DSC/DRC Board. ABB suggests that the user design synchro smoothing into a software driver. Smoothing is accomplished by incrementing to the desired angle. 

The DSC/DRC Board is initialized at power-up with the field (user torque receivers) disconnected and the front panel Fail LED illuminated. The format and register addresses to control the relays, front panel Fail LED, and output torque receivers are shown in Table 3-2 on page 51. All JCU-01 data output registers are write only and can be written as bytes or words.

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