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IndustryArena Forum > CNC Electronics > Servo Motors / Drives > Delta ASDA B2: Sending Speed/Torque via Modbus
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  1. #1
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    Join Date
    Mar 2021
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    2

    Unhappy Delta ASDA B2: Sending Speed/Torque via Modbus

    I have a Delta ASDA B2 Driver connected by my PC via IEEC 1394/ ModBUS RTU.
    If I send a reading command as:
    11 03 01 12 00 01 27 63

    (where:
    0x11 Motor Address
    0x03 Modbus RTU Read command
    0x0112 read internal speed #1 command
    0x0001 read 1 register
    0x2763 CRC check
    )
    I correctly have this answer:
    0x11
    0x03
    0x02
    0x03E8 speed. In decimal values it is 1000: OK
    0x7939 CRC
    Then -via Modbus- I can start/stop the servo without problems.
    But if I'm going to change the speed by the command (with servo off):
    11 06(write single register) 01 12 01 F4 (where 0x01F4 is 500 in decimals) 2A B4
    the system gives me an error:

    11 86 36 C3 B3


    What is my error?
    Thanks and best regards

  2. #2
    Member
    Join Date
    Mar 2021
    Posts
    2

    Re: Delta ASDA B2: Sending Speed/Torque via Modbus

    Solved!
    I simply used the 0x10 function (write multiple regs) and not the 0x06 one.
    The final format is something like (for 300.0 rpm):
    0x11 0x10 0x01 0x12 0x00 0x02 0x04 0x0B 0xB8 0x00 0x00 0xA8 0x2B (ASDA B2 Manual 8-13)

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