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Microstepping using S7 200

Created by: arihant122 at: 12/3/2012 10:38 AM (18 Replies)

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12/3/2012 10:38 AM	Rate (0)
arihant122 Posts: 21 Rating: (0)	I want to know if it is possible to perform micro-stepping operation in a stepper motor using S7 200 PLC (CPU 224) and motor driver. Is it related to PLC programming or some external hardware is needed? Thanks in advance.
arihant122 Posts: 21 Rating: (0)
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12/3/2012 11:33 AM	Rate (0)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 11/18/2024 Posts: 5697 Rating: (715)	Hello, there is a special module to control stepper drives. 6ES7253-1AA22-0XA0 You can also program a pulstrain output(only if you have transistor output) see S7200 programming tips Tip 22. Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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12/5/2012 8:16 AM	Rate (0)
arihant122 Posts: 21 Rating: (0)	Thank you for your reply. I dont have this module with me so have to do away with whatever i have. The CPU is 224 and i have an analog signal module EM 235. Is it possible to perform microstepping?
arihant122 Posts: 21 Rating: (0)
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12/5/2012 8:42 AM	Rate (0)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 11/18/2024 Posts: 5697 Rating: (715)	Hello, All depends on your stepper motor drive, do you have any documentation of this drive? Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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12/6/2012 6:13 AM	Rate (0)
arihant122 Posts: 21 Rating: (0)	I am attaching the technical details of driver I am using. The stepper motor used is bipolar (DC 4.5 Ampere,0.48 Ohm). Attachment Motor driver.pdf (634 Downloads)
arihant122 Posts: 21 Rating: (0)
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12/6/2012 2:41 PM	Rate (0)
William_B Posts: 5225 Rating: (1196)	arihant122 I want to know if it is possible to perform micro-stepping operation in a stepper motor using S7 200 PLC (CPU 224) and motor driver. Is it related to PLC programming or some external hardware is needed? Thanks in advance. Hi Friend, Microstepping is a function of the stepper driver (amplifier). The PLC does not determine this. The drive you sent the specification on has the choice of full stepping or half stepping. Where a full step is 1.8 degrees, half step will give you 1.8 * 0.5 = 0.9 degrees for each PLC pulse. Other drives (ones we use) might offer you 10 "micro steps". Keep in mind that a "step" is defined by your stepper motor. Most popular motors are defined as 200 step motors (1.8 degrees). Do not however assume it is like this always. The disadvantage with micro stepping is that it degrades your maximum speed. With the PLC pulse output at maximum 20kHz means full stepping > 20k / 200 > 100 revolutions per second 10 micro stepping > 100 / 10 = 10 rev/sec Be careful on the drive you have selected. There is special instructions on how to connect 24Vdc as pulse. Also I recommend using PULSE and DIRECTION as drive method. I hope you have a good look also at the wizard provided in the S7-200 software to write the code you need to pulse the stepper driver. Good Luck. w
William_B Posts: 5225 Rating: (1196)
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This contribution was helpful to 1 thankful Users AhmadWAyase

12/13/2012 1:51 PM	Rate (0)
arihant122 Posts: 21 Rating: (0)	Thanks William for pointing out that only half stepping is possible with this driver. Since I need a more shorter step, i have changed the motor which has 0.72 degree step size.By half stepping I can get an step change of 0.36 degree (enough to meet my requirement).Now the problem is with programming. I want the motor to move forward and reverse at some set speed.To bring the motor back to home position, I also want jogging in both direction. I have writtentwo programs attached herewith. There is no problem with forward and reverse movement. But I am not able to make it jog forward and reverse. I want separate switch for rotation and jogging. Please help. Attachment Stepper motor-bidirectional.zip (629 Downloads)
arihant122 Posts: 21 Rating: (0)
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12/13/2012 2:33 PM	Rate (0)
William_B Posts: 5225 Rating: (1196)	ouch.. there is much easier ways. Under the software help try the following topic: "Position Control Wizard:PTO /PWM Configuration" w
William_B Posts: 5225 Rating: (1196)
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12/14/2012 10:44 AM	Rate (0)
arihant122 Posts: 21 Rating: (0)	Hi, I tried to execute my application using POsition control wizard but to no avail. I am finding this wizard more difficult than writing simple ladder logic as I did. Can anybody suggest alteration in ladder program to run my motor as I wish? Thanks.
arihant122 Posts: 21 Rating: (0)
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12/18/2012 10:36 AM	Rate (0)
arihant122 Posts: 21 Rating: (0)	Hi William, I was able to run the motor both way as well as jog it using position control wizard. Its really easy. I am attaching the program so that newbees like me can work on similar applications. Thanks. Attachment Posn wizard-CW+CCW.zip (673 Downloads)
arihant122 Posts: 21 Rating: (0)
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This contribution was helpful to 5 thankful Users O_Moderator Marcjan AhmadWAyase navo Matt zen Earthling

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