2/16/2018 4:17 PM | |
Joined: 9/27/2006 Last visit: 9/24/2024 Posts: 12282 Rating: (2685) |
Hello; Could you please explain why you have to use Control Word 2 in your project? I don't recall having to use CW2 in any of the projects I have programmed with a MM4 drive. See the definition of Control Word 1 along with the standard PPOx telegrams for MM4 drives, in the screenshot below, taken from the Profibus optional board manual:
https://support.industry.siemens.com/cs/ww/en/view/6586565 Notice that itt states that Control Word 2 is linked to PZD4 ; the MM420 supports only PPO3 and PPO1, which does not access PZD4 so the question is moot. The following FAQ is basically a summary of the manual above, and contains an explanation of the Speed reference word that you can use in your program. The speed reference (HSW register in PPO3 and PPO1) is normalized (hex, 0000 to 4000) based on the max. frequency you have setup on the drive at commissioning. Let's say you have set it up for 50 Hz. if you write hex(0000) to HSW, the speed setpoint is set to 0 Hz. If you write hex(4000) to HSW, then speed reference is 50 Hz (max. freq.). If you write hex(2000) to HSW, then speed reference is 25 Hz (½ max. freq.) if you write hex(1000) to HSW, then speed reference is 12,5 hz (¾ max, freq). If you write hex(5000) to HSW, then speed reference is 60 Hz (above max. freq)
https://support.industry.siemens.com/cs/ww/en/view/8894363 Here are some sample programs for the MM4 drive with Profibus. There are 4 programs (along with basic documentation), 2 based on PPO3 (no parameter read/write) and 2 with PPO1 (PKW enable); for each type you have 2 variations: communication with Load/Transfer instructions, and 2 with SFC14/15. I suggest you start with sample 1: PPO3 telegram with Load/Transfer instructions, it is the simpler of the configurations. Later you can try with SFC 14/15, it is a bit more complicated
https://support.industry.siemens.com/cs/ww/en/view/8894584 Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 2/16/2018 5:05:37 PM |
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2/16/2018 5:59 PM | |
Posts: 23 Rating: (0) |
First of all thanks for your kind reply . I need CW2 for 1- fixed Frequency 2- PID Control and both of them only available on CW2 |
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