Rockwell-automation 2098-DSD-xxx Ultra3000 Host Commands for Serial In Uživatelský manuál stáhnout pdf (Strana 169)

Publication 2098-RM003A-EN-P October 2001

Using Host Commands C-5

Exercise #2 – Controlling

Speed in Host Mode

This exercise issues a host command to set the speed of the motor. It

builds on the Ultra family command previously issued to place the

drive in velocity set point control mode. The command string

parameters to set the motor speed to 500 rpm are:

Note: The numbers are hexadecimal.

1. Convert 500 rpm to an 8 character, hexadecimal value. Assume a

standard encoder with 2000 lines per revolution (8000 counts/rev)

to calculate the hexadecimal data value:

2. Calculate the checksum and convert to hexadecimal by subtracting

760 from 256 (256 - 760 = -504), and converting -504 to hex

(0xFFFFFE08).

3. Prefix the string with a colon and append the two least significant

digits of the hex value (08) to the end of the command string.

4. Type the command string into Hyperterminal followed by the

Enter key. The motor will rotate at 500 rpm when the drive is

enabled.

5. Stop the motor using the same command by setting the speed to

zero (0) rpm.

Command String :0006D100012EBCcc Parameters

cc Checksum

00012EBC Data

1 Function

06D Parameter

00 Drive Address

Encoder Conversion 1 rpm = 8000 counts/minute or 155 counts/second

Hex Conversion 500 rpm = 77,500 counts/second or 0x12EBC hex

Hex Character 0006D100012EBCcc

ASCII Value 48 48 48 54 68 49 48 48 48 49 50 69 66 67

ASCII Sum — 96 144 198 218 267 315 363 411 508 558 627 693 760

Hex Conversion 256 - 760 = 0xFFFFFE08 Hex

Command String :0006D100012EBC08

1 2 ... 164 165 166 167 168 169 170 171 172 173 174 175 176

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