5/15/2015 3:55 PM | |
Joined: 9/2/2012 Last visit: 4/18/2024 Posts: 711 Rating: (30) |
Dear all, There is one S7-200 PLC installed CPU216 (6ES7216-2AD00-0XB0) which is communicating with old micrmaster drive (m3) in USS protocol (total 4 numbers of drive in USS loop). This system was working for last 10+ years without any problem. Currently there is some problem like, after giving start command drive is starting with slow speed, after some delay reaching full speed as per set-point ; for stopping also same. Ramp up and down time are tried with different values, kept least value.But result is same. Start command is directly via digital output from PLC to the drive, speed reference is via USS communication. Now i want to check from PLC set-point is sending properly to the drive or is there is any delay in sending set-point to drive. There is no USS library used in this project. It is done via interupt block. From all "ALL_TIPS_1208_EN_ 200" i referred tip52b sample program, still in my case i could not trace from which address location set-points are sent to the drive. I can see XMT block with TBL entry = VB99, but in VB99 value is showing as 14. Cross checked the area vw99 to vw120, but am not sure that am looking at right place. how i can trace the set-point area which is sending to the drive? Attaching PLC program herewith, there is no original backup available, uploaded backup is attaching. AttachmentUSS.zip (174 Downloads) |
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5/18/2015 1:07 PM | |
Joined: 9/2/2012 Last visit: 4/18/2024 Posts: 711 Rating: (30) |
Hai, any suggestion... |
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