11/15/2005 5:57 PM | |
Posts: 22 Rating: (0) |
You do not need drives ES for a basic set up. You will find the drives in the hardware catalogue in S7. They are under Profibus DP>Simovert>Masterdrives CBP2, CBP2 being the profibus option card. You will then select a PPO type. For you PPO type 4 seems to be the one. This has 6 Process data words for you to use, ie you can send and recieve 6 words to and from the drive.The first and second words to the drive are the control word and setpoint and the first and second words back from the drive are the status word and actual frequency. The other words can be used to recieve current, torque etc. You will need to use SFC 14 and SFC 15 in your program as you are sending more than 2 words. (If you use PPO type 3 (only 2 words) you can address as periferal input/outputs eg PID256 PQD256). If you can post an email address I can send an example of using SFC 14&15 with Micromasters. The principal is the same. |
11/16/2005 9:14 AM | |
Posts: 102 Rating: (3) |
Hai All, My experience with the proffibus communication of the Drives with PLC has been like with Parameterize the drives for PZD's . The parameters to be modified can be found easily withthe help of Drive Monitor which comes free with every drive and then assign the values you need in P 2051 index 0 to 7. The data will come as PIW to the PLC which can be manipulated as per your requirement. If needing a sample Program Just drop in a message Regards Shamsher |
11/16/2005 10:17 AM | |||
Posts: 6 Rating: (1) |
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2/8/2006 9:10 PM | |
Posts: 3 Rating: (1) |
This is a long story. [:P] |
This contribution was helpful to1 thankful Users |
2/10/2006 9:28 AM | |
Joined: 9/23/2005 Last visit: 10/18/2024 Posts: 4760 Rating: (728) |
There's no need to use SFC14/15 with new CPUs anymore. |
Regards, |
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2/10/2006 11:42 AM | |
Posts: 22 Rating: (0) |
How do you move more than 2 words if you dont use SFC14 and 15? You can only move PI Double and PQ Double. As far as I know you need SFC14 and 15 or you telegram transmission can be interupted by the program scan....???? Anyway, here is an example of using SFC14 15 AttachmentPB_SFC_14_15.zip (1017 Downloads) |
2/10/2006 3:32 PM | |
Posts: 102 Rating: (3) |
Hai All But again as far as the use of SFC 14 and 15 is concerned you only need them if you want to transfer acyclic data. But as far as the communication of Ana is concerned you don't need that at all. All you have to do is to set the 10th bit of CW1 as high and then the communication for the data on proffibus starts. All then you have to do is to parameterise the drive to send and recieve the data. The first word always fetches the first 8 bits of control word1 and the status word1. The second word to be transmitted has the setpoint and the speed at which the drive is running.Next words you can transfer the frequency and the status words. Regards Shamsher |
2/10/2006 3:58 PM | |
Posts: 22 Rating: (0) |
I still don't get your point If you are only sending 2 words too the drive and recieving 2 words from the drive ie control word/ setpoint and status word/actual speed then I agree you don't need SFC14 and 15 you can use Move 047F4000hex as a double word (move 047F4000 to PQD256) and recieve PID256. But if you want to get back from the drive status, actual speed and actual current, etc,etc,etc then there is a chance that say the current value can be interupted before the whole of the word(telegram) has been sent and you would therefore get an incorrect value back to the PLC. The function of SFC 14 and 15 is to transmit the whole of the telegram of say 6 words without interuption. |
2/10/2006 4:57 PM | |
Posts: 22 Rating: (0) |
I have just made some enquiries and I think I see what you mean. The new CPUs you can send say 6 words by using 3 move comands each moving a double word and the CPU will send it consistantly. Am I right? |
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